Usha Ranjan Ghatak - Publications

Affiliations: 
1963-1996 Indian Association for the Cultivation of Science 
Area:
Organic chemistry
Website:
http://insaindia.res.in/BM/BM32_0704.pdf

183 high-probability publications. We are testing a new system for linking publications to authors. You can help! If you notice any inaccuracies, please sign in and mark papers as correct or incorrect matches. If you identify any major omissions or other inaccuracies in the publication list, please let us know.

Year Citation  Score
2010 Ghosh K, Ghatak UR. ChemInform Abstract: Synthetic Studies Towards Complex Diterpenoids. Part 20. Total Synthesis of the Linear Abietane o-Quinone Umbrosone. Cheminform. 30: no-no. DOI: 10.1002/CHIN.199935210  0.333
2010 Mukhopadhyaya JK, Ghosh AK, Ghatak UR. ChemInform Abstract: Stereoselective Intramolecular 6-exo-Heck Reaction: A Facile Synthetic Route to Podocarpa-8,11,13-triene and Diterpenoid Resin Acids Intermediates. Cheminform. 30: no-no. DOI: 10.1002/CHIN.199909214  0.436
2010 GHOSH AK, MUKHOPADHYAYA JK, GHATAK UR. ChemInform Abstract: Regioselective Aryl Radical Cylization. Part 2. Synthesis of Octahydro-1H-dibenzo[a,d]cycloheptenes Through 7-endo Ring Closure. Cheminform. 29: no-no. DOI: 10.1002/CHIN.199802088  0.405
2010 PAL S, SATYANARAYANA GOSV, BHATTACHARJEE G, GHATAK UR. ChemInform Abstract: Condensed Cyclic and Bridged-Ring System: Part 16. Synthesis of Diastereoisomeric (6SR, 10SR)-10-Hydroxy-2-methoxy-6-methyl-6,10- methano-5-oxo-6,7,8,9,10,11-hexahydro-5H-benzocyclononen-12-ylacetic Acid Lactones. Cheminform. 27: no-no. DOI: 10.1002/CHIN.199626235  0.454
2010 GHATAK UR. ChemInform Abstract: Selective Intramolecular Carbon-Carbon Bond Formation in Polycarbocyclic Synthesis: From Cationic to Radical Induced Processes Cheminform. 27: no-no. DOI: 10.1002/chin.199604304  0.312
2010 GHOSH K, GHATAK UR. ChemInform Abstract: Regioselective 9-endo Aryl Radical Cyclization: A New Synthetic Route to Decahydro-5H-dibenzo(a,d) and (a,e)-Cyclononenols. Cheminform. 26: no-no. DOI: 10.1002/chin.199548094  0.342
2010 MUKHOPADHYAYA JK, PAL S, GHATAK UR. ChemInform Abstract: Efficient Palladium Catalyzed Stereocontrolled Synthesis of 4a-Angular Methyl-Substituted Hydrofluorenes. Cheminform. 26: no-no. DOI: 10.1002/chin.199536123  0.51
2010 GHOSH K, GHATAK UR. ChemInform Abstract: First Total Synthesis of the Linear Abietane Diterpenoid Orthoquinone Umbrosone. Cheminform. 25: no-no. DOI: 10.1002/chin.199452215  0.379
2010 PAL S, BANIK BK, GHATAK UR. ChemInform Abstract: Condensed Cyclic and Bridged-Ring Systems. Part 15. Acid-Catalyzed Intramolecular Alkylations in 1-Diazoacetyl-1,2,3,4-tetrahydro-9- methoxy-1-methylphenanthrenes. Cheminform. 25: no-no. DOI: 10.1002/chin.199433065  0.448
2010 GHOSH K, GHOSH AK, GHATAK UR. ChemInform Abstract: Highly Regioselective 8-endo-Aryl Radical Cyclization: A New Synthetic Route to Decahydrodibenzo-(a,d)- and -(a,e)-Cyclooctenols. Cheminform. 25: no-no. DOI: 10.1002/chin.199428160  0.357
2010 MUKHOPADHYAYA JK, MUKHOPADHYAYA C, GHATAK UR. ChemInform Abstract: Electron Transfer Induced Reductive Cleavage of γ-Lactones to Carboxylic Acids by Sodium Hexamethylphosphoric Triamide (HMPA). Cheminform. 25: no-no. DOI: 10.1002/chin.199428147  0.321
2010 GHOSH AK, MUKHOPADHYAY C, GHATAK UR. ChemInform Abstract: Synthetic Studies Towards Complex Diterpenoids. Part 19. Total Synthesis of (.+-.)-Deoxofaveline, (.+-.)-Faveline Methyl Ether and (.+ -.)-Faveline. Cheminform. 25: no-no. DOI: 10.1002/chin.199422213  0.723
2010 MUKHOPADHYAY C, GHOSH S, MUKHERJEE M, MUKHERJEE AK, GHATAK UR. ChemInform Abstract: Ar1-5 Cyclizations of (3RS)- and (3SR)-1-Diazo-3-((1RS)-6-methoxy-1- methyl-1,2,3,4-tetrahydro-1-naphthyl)butan-2-ones: Synthesis and Crystal Structure of (1RS,4RS,5RS,9RS)-4,5-Dimethyltricyclo(7.4.0.01,5) tridecane-3,11-dione Cheminform. 25: no-no. DOI: 10.1002/chin.199417127  0.643
2010 DEB S, CHAKRABORTI R, GHATAK UR. ChemInform Abstract: Synthesis of 1-p-Methoxyphenyl- and 1-(p-Methoxyphenyl)-4- methylbicyclo(2.2.1)heptan-7-one. The Oxidation of 7-Hydroxy-1-(p- methoxyphenyl)-4-methylbicyclo(2.2.1)heptane-7-carboxylic Acid with Lead Tetraacetate. Cheminform. 24: no-no. DOI: 10.1002/chin.199335162  0.307
2010 PAL S, BANIK BK, GHATAK UR. ChemInform Abstract: A Facile Synthetic Route to 1,1-Disubstituted 2,3-Dihydro-1H-benz(f) indene-4,9-diones. Cheminform. 24: no-no. DOI: 10.1002/chin.199334148  0.279
2010 GHOSH S, GHATAK UR. ChemInform Abstract: Synthesis of (.+-.)-13-Acetyl-12-hydroxypodocarpa-8,11,13-trien-7-one and Related Compounds: Non-Conformity with the Assigned Structure of Nimbosodione. Cheminform. 24: no-no. DOI: 10.1002/chin.199307259  0.347
2010 GHOSH S, GHATAK UR. ChemInform Abstract: Influence of Electron Donating Aromatic Substituents on the Ruthenium Tetroxide-Catalyzed Oxidation of (.+-.)-Podocarpa-8,11,13-trienes. Cheminform. 23: no-no. DOI: 10.1002/chin.199252255  0.299
2010 GHOSH S, GHOSH AK, GHATAK UR. ChemInform Abstract: An Expeditious Stereoselective Total Synthesis of (.+-.)-Podocarpa-2,8, 11,13-tetraene and 3-Oxygenated (.+-.)-Podocarpa-8,11,13-trienes by Acid-Catalyzed Cycloalkylation Route. Cheminform. 23: no-no. DOI: 10.1002/chin.199230224  0.425
2010 PAL S, MUKHERJEE M, PODDER D, MUKHERJEE AK, GHATAK UR. ChemInform Abstract: A Highly Regioselective 6-endo-Aryl Radical Cyclization: Stereocontrolled Synthesis of trans-Octahydroanthracenes. Cheminform. 23: no-no. DOI: 10.1002/CHIN.199217132  0.476
2010 GHOSH S, BANIK BK, GHATAK UR. ChemInform Abstract: An Expeditious Synthesis of 1,2,3,4-Tetrahydro-1,1- dimethylphenanthrenes. Cheminform. 23: no-no. DOI: 10.1002/chin.199212143  0.454
2010 GHOSH S, BANIK BK, GHATAK UR. ChemInform Abstract: Influence of Electron Donating Aromatic Substituents on the Stereochemistry of the Products in Cycloalkylations of 2-(2-Arylethyl)- 3,3-dimethyl-1-methylenecyclohexane and Related Substrates: Mechanisms of Aromatic Cycloalkylations. Cheminform. 23: no-no. DOI: 10.1002/chin.199212073  0.319
2010 RAY C, SAHA B, GHATAK UR. ChemInform Abstract: Synthesis of Some Angularly Cyclopentanone Fused Hydrophenanthrene and Hydrofluorene Derivatives by Acid-Catalyzed Intramolecular C- Alkylation of γ,δ-Unsaturated α′-Diazomethyl Ketones. Cheminform. 23: no-no. DOI: 10.1002/chin.199203173  0.518
2010 PAL S, GHOSH S, BANIK BK, ALAM SK, GHATAK UR. ChemInform Abstract: Synthesis of (.+-.)-2-Methoxy-9a-carbamorphinan (V) and (.+-.)-2- Methoxy-9a-carba-14α-morphinan (IX). Acid-Catalyzed Cyclizations of 1-(m-Methoxybenzyl)-4,4a,5,6,7,8-hexahydronaphthalen-2(3H)-one (II) and 1-(m-Methoxybenzyl)octalin ( Cheminform. 22: no-no. DOI: 10.1002/chin.199110137  0.421
1999 Ghosh K, Ghatak UR. Synthetic studies towards complex diterpenoids. Part 20.1 Total synthesis of the linear abietane o-quinone umbrosone Journal of the Chemical Society-Perkin Transactions 1. 1359-1362. DOI: 10.1039/A809579E  0.468
1997 Ghosh AK, Mukhopadhyaya JK, Ghatak UR. Regioselective Aryl Radical Cyclisation. Part 2.1 Synthesis of Octahydro-1H-Dibenzo[a,d]Cycloheptenes Through 7-endo Ring Closure Journal of the Chemical Society-Perkin Transactions 1. 2747-2756. DOI: 10.1039/A702253K  0.527
1995 Mukhopadhyaya JK, Pal S, Ghatak UR. An Efficient Palladium Catalyzed Stereocontrolled Synthesis of 4a-Angular Methyl Substituted Hydrofluorenes Synthetic Communications. 25: 1641-1657. DOI: 10.1080/00397919508015849  0.537
1995 Ghosh K, Ghatak UR. Regioselective 9- aryl radical cyclisation: A new synthetic route to decahydro-5-dibenzo[a,d] and [a,e]-cyclononenols Tetrahedron Letters. 36: 4897-4900. DOI: 10.1016/0040-4039(95)00880-L  0.495
1994 Pal S, Banik BK, Ghatak UR. Condensed cyclic and bridged-ring systems. Part 15. Acid-catalysed intramolecular alkylations in 1-diazoacetyl-1,2,3,4-tetrahydro-9-methoxy-1-methylphenanthrenes Journal of the Chemical Society-Perkin Transactions 1. 1105-1110. DOI: 10.1039/P19940001105  0.561
1994 Ghosh AK, Mukhopadhyay C, Ghatak UR. Synthetic studies towards complex diterpenoids. Part 19. Total synthesis of (±)-deoxofaveline, (±)-faveline methyl ether and (±)-faveline Journal of the Chemical Society-Perkin Transactions 1. 327-332. DOI: 10.1039/P19940000327  0.699
1994 Ghosh K, Ghosh AK, Ghatak UR. Highly regioselective 8-endo-aryl radical cyclisation: a new synthetic route to decahydrodibenzo-[a,d]- and -[a,e]-cyclooctenols Journal of the Chemical Society, Chemical Communications. 629-630. DOI: 10.1039/C39940000629  0.501
1994 Pal S, Mukhopadhyaya JK, Ghatak UR. Regioselective Aryl Radical Cyclization. 1. Stereocontrolled Synthesis of Linearly Condensed Hydroaromatic Carbocyclic Systems through 6-endo-Ring Closures Journal of Organic Chemistry. 59: 2687-2694. DOI: 10.1021/Jo00089A009  0.536
1993 Deb S, Chakraborti R, Ghatak UR. Synthesis of 1-p-Methoxyphenyl and 1-p-Methoxyphenyl-4-methylbicyclo-[2.2.1]heptan-7-one. The Oxidation of 7-Hydroxy-1-p-methoxyphenyl-4-methylbicyclo[2.2.1]heptan-7-carboxylic Acid with Lead Tetraacetate Synthetic Communications. 23: 913-924. DOI: 10.1080/00397919308013288  0.485
1992 Ghosh S, Ghosh AK, Ghatak UR. An Expeditious Stereoselective Total Synthesis of (±)-Podocarpa-2,8,11.13-Tetraene and 3-Oxygenated (±)-Podocarpa-8,11,13-Trienes by Acid-Catalyzed Cyclialkylation Route Synthetic Communications. 22: 553-565. DOI: 10.1080/00397919208019254  0.434
1992 Pal S, Banik BK, Ghatak UR. A Facile Synthetic Route to 1,1-Disubstituted 2,3-Dihydro-1H-benz[f]indene-4,9-diones Synthesis. 1992: 1073-1075. DOI: 10.1055/S-1992-26304  0.498
1992 Ghosh AK, Ray C, Ghatak UR. First total synthesis of the novel cytotoxic benzocycloheptenes (±)-deoxofaveline and (±)-faveline methyl ether Tetrahedron Letters. 33: 655-658. DOI: 10.1016/S0040-4039(00)92335-9  0.428
1992 Ghosh S, Ghatak UR. Influence of electron donating aromatic substituents on the ruthenium tetroxide-catalysed oxidation of (±)-podocarpa-8,11,13-trienes Tetrahedron. 48: 7289-7296. DOI: 10.1016/S0040-4020(01)88267-3  0.538
1991 Ray C, Saha B, Ghatak UR. Synthesis of Some Angularly Cyclopentanone Fused Hydrophenanthrene and Hydrofluorene Derivatives by Acid-Catalyzed Intramolecular C-Alkylation of γ,δ - Unsaturated α′-Diazomethyl Ketones Synthetic Communications. 21: 1223-1242. DOI: 10.1080/00397919108021041  0.585
1991 Ghosh S, Banik BK, Ghatak UR. An expeditious synthesis of 1,2,3,4-tetrahydro-1,1-dimethylphenanthrenes Journal of the Chemical Society-Perkin Transactions 1. 3195-3197. DOI: 10.1039/P19910003195  0.512
1991 Ghosh S, Banik BK, Ghatak UR. Influence of electron donating aromatic substituents on the stereochemistry of the products in cycloalkylations of 2-(2-arylethyl)-3,3-dimethyl-1-methylenecyclohexane and related substrates: mechanisms of aromatic cycloalkylations Journal of the Chemical Society-Perkin Transactions 1. 3189-3193. DOI: 10.1039/P19910003189  0.488
1991 Pal S, Mukherjee M, Podder D, Mukherjee AK, Ghatak UR. A highly regioselective 6-endo-aryl radical cyclisation: stereocontrolled synthesis of trans-octahydroanthracenes Journal of the Chemical Society, Chemical Communications. 1591-1593. DOI: 10.1039/C39910001591  0.465
1990 Ghatak UR. An expeditious total synthetic route to naturally occurring tricarbocyclic ring-C-aromatic diterpenoids: mechanisms of cyclialkylations Pure and Applied Chemistry. 62: 1413-1416. DOI: 10.1351/pac199062071413  0.374
1990 Pal S, Ghosh S, Banik BK, Alam SK, Ghatak UR. Synthesis of (±)-2-Methoxy-9a-Carbamorphinan and (±)-2-Methoxy-9a-Carba-14α-Morphinan: Acid Catalyzed Cyclizations of 1-m-Methoxybenzyl-4, 4a,5,6,7,8-Hexahydronaphthalen-2(3H)-ONE and 1 -m-Methox Ybenzyloctalins Synthetic Communications. 20: 2203-2216. DOI: 10.1080/00397919008053160  0.521
1990 Deb S, Bhattacharjee G, Ghatak UR. Synthetic studies towards complex diterpenoids. Part 18. Total synthesis of (±)-isopisiferin and the related compounds Journal of the Chemical Society-Perkin Transactions 1. 1453-1458. DOI: 10.1039/P19900001453  0.524
1990 GHATAK UR. ChemInform Abstract: An Expeditious Total Synthetic Route to Naturally Occurring Tricarbocyclic Ring Ring-C-Aromatic Diterpenoids: Mechanisms of Cyclialkylations Cheminform. 21. DOI: 10.1002/chin.199047323  0.39
1990 RAY C, SAHA B, GHATAK UR. ChemInform Abstract: Condensed Cyclic and Bridged-Ring Systems. Part 14. Synthesis of Some Bridged Propanohydrophenanthrene, -hydrofluorene and Polycyclic Benzopropellane Derivatives Through Intramolecular C-Alkylations of γ,δ-Unsaturated α′-Diazomethyl K Cheminform. 21. DOI: 10.1002/chin.199036149  0.447
1990 DEB S, BHATTACHARJEE G, GHATAK UR. ChemInform Abstract: Synthetic Studies Towards Complex Diterpenoids. Part 18. Total Synthesis of (.+-.)-Isopisiferin and the Related Compounds. Cheminform. 21. DOI: 10.1002/chin.199035263  0.371
1990 KANJILAL PR, GHOSH R, CHOWDHURY PR, GHATAK UR. ChemInform Abstract: Synthesis and X-Ray Structural Analysis of (.+-.)-2,3,4,4aα,4bα,5,6,7,8,8aα,9,9aα-Dodecahydro-1.be# ta.-methyl-7-oxo-1H-fluorene-1α-carboxylic Acid Cheminform. 21. DOI: 10.1002/chin.199007173  0.38
1989 Banik BK, Ghatak UR. An Expeditious Total Synthesis of (±)-Sempervirol, (±)-Sugiol and (±)-Xanthopherol Methyl Ether by Acid-Catalyzed Cyclialkylation Route Synthetic Communications. 19: 1351-1367. DOI: 10.1080/00397918908054545  0.422
1989 Chakraborti R, Ranu BC, Ghatak UR. CHEMOSELECTIVE CATALYTIC HYDROGENATION OF CARBONYL CONJUGATED DOUBLE BONDS IN THE PRESENCE OF STYRENOID BONDS IN BICYCLO[3.3.1]NONADIENONES Organic Preparations and Procedures International. 21: 377-380. DOI: 10.1080/00304948909356405  0.616
1989 Banik BK, Ghatak UR. Synthetic studies towards complex diterpenoids-171: synthesis and oxidative cleavage of ()-19,20-cycloabieta-19-oxo-8,11,13-triene Tetrahedron. 45: 3547-3556. DOI: 10.1016/S0040-4020(01)81033-4  0.575
1989 CHAKRABORTI R, RANU BC, GHATAK UR. ChemInform Abstract: Chemoselective Catalytic Hydrogenation of Carbonyl-Conjugated Double Bonds in the Presence of Styrenoid Bonds in Bicyclo(3.3.1)nonadienones. Cheminform. 20. DOI: 10.1002/chin.198947173  0.591
1989 BANIK BK, GHATAK UR. ChemInform Abstract: Synthetic Studies Towards Complex Diterpenoids. Part 17. Synthesis and Oxidative Cleavage of (+)-19,20-Cycloabieta-19-oxo-8,11,13-triene. Cheminform. 20. DOI: 10.1002/chin.198940303  0.362
1989 BANIK BK, GHOSH S, GHATAK UR. ChemInform Abstract: Influence of Methoxy- and Methyl-Aromatic Substituents on Stereochemistry of the Products in the Acid-Catalyzed Cyclization of 2-(2-Arylethyl)-1,3,3-trimethylcyclohexanols: Stereocontrolled Total Synthesis of (.+-.)-Nimbidiol and (.+- Cheminform. 20. DOI: 10.1002/chin.198912066  0.488
1988 Saha B, Bhattacharjee G, Ghatak UR. Vinylogous Wolff rearrangement of cyclic β,γ-unsaturated diazomethyl ketones: a new synthetic method for angularly functionalised polycyclic systems Journal of the Chemical Society-Perkin Transactions 1. 939-944. DOI: 10.1039/P19880000939  0.508
1988 Ranu BC, Chakraborti R, Ghatak UR. A formylation–cyclisation method of synthesis of cycloalkenones from unsaturated ketones. Part 3. Simple synthesis of some functionalised angularly fused cyclopentenone and cyclopentanone derivatives Journal of the Chemical Society-Perkin Transactions 1. 795-801. DOI: 10.1039/P19880000795  0.744
1988 Banik BK, Ghosh S, Ghatak UR. Influence of methoxy-and methyl-aromatic substituents on stereochemistry of the products in the acid-catalyzed cyclization of 2-(2-arylethyl)-1,3,3-trimethylcyclohexanols: stereocontrolled total synthesis of (±)-nimbidiol and (±)-nimbiol Tetrahedron. 44: 6947-6955. DOI: 10.1016/S0040-4020(01)86225-6  0.5
1988 BANIK BK, GHOSH S, GHATAK UR. ChemInform Abstract: Stereoselective Total Synthesis of (.+-.)-Nimbidiol Cheminform. 19. DOI: 10.1002/chin.198832289  0.459
1988 GHATAK UR. ChemInform Abstract: Synthesis of Polycyclic Diterpenes Cheminform. 19. DOI: 10.1002/chin.198831379  0.453
1988 SAHA B, BHATTACHARJEE G, GHATAK UR. ChemInform Abstract: Vinylogous Wolff Rearrangement of Cyclic β,γ-Unsaturated Diazomethyl Ketones: A New Synthetic Method for Angularly Functionalized Polycyclic Systems. Cheminform. 19. DOI: 10.1002/chin.198830172  0.355
1988 RANU BC, CHAKRABORTI R, GHATAK UR. ChemInform Abstract: A Formylation-Cyclization Method of Synthesis of Cycloalkenones from Unsaturated Ketones. Part 3. Simple Synthesis of Some Functionalized Angularly Fused Cyclopentenone and Cyclopentanone Derivatives. Cheminform. 19. DOI: 10.1002/chin.198830091  0.696
1988 CHAKRABORTI R, RANU BC, GHATAK UR. ChemInform Abstract: Stereospecific Synthesis of endo-6-Aryl-2-oxobicyclo(3.3.1)nonanes. Cheminform. 19. DOI: 10.1002/chin.198816161  0.704
1987 Chakraborti R, Ranu BC, Ghatak UR. Stereospecific Synthesis ofEndo-6-Aryl-2-Oxobicyclo [3.3.1]Nonanes Synthetic Communications. 17: 1539-1543. DOI: 10.1080/00397918708057783  0.694
1987 Saha B, Satyanarayana GOSV, Ghatak UR. Acid-catalysed intramolecular C-alkylation in β,γ-unsaturated diazomethyl ketones. Part 5. Synthesis of functionalised hydrofluorene derivatives via novel fragmentation reactions Journal of the Chemical Society-Perkin Transactions 1. 1263-1268. DOI: 10.1039/P19870001263  0.541
1987 Chkraborty AK, Saha B, Ray C, Ghatak UR. Alkali metal-liquid ammonia reduction of γ-lactones to diols and cyclic hemiacetals: stereochemical influence by the neighbouring group on the nature Tetrahedron. 43: 4433-4437. DOI: 10.1016/S0040-4020(01)90319-9  0.46
1987 SAHA B, SATYANARAYANA GOSV, GHATAK UR. ChemInform Abstract: Acid-Catalyzed Intramolecular C-Alkylation in β,γ-Unsaturated Diazomethyl Ketones. Part 5. Synthesis of Functionalized Hydrofluorene Derivatives via Novel Fragmentation Reactions. Cheminform. 18. DOI: 10.1002/chin.198740155  0.482
1987 BANIK BK, CHAKRABORTI AK, GHATAK UR. ChemInform Abstract: An Efficient Synthesis of 2-Substituted 3,3-Dimethylcyclohexan-1-ones. A Simple Synthetic Route to Podocarpa-8,11,13-triene Intermediates. Cheminform. 18. DOI: 10.1002/chin.198715167  0.643
1987 CHAKRABORTI R, DEB S, GHATAK UR. ChemInform Abstract: Synthesis of αβ-Unsaturated Aldehydes by 1,3-Carbonyl Transposition Through One-Carbon Homologation. Part 2. Cheminform. 18. DOI: 10.1002/chin.198714186  0.391
1986 Chakraborti AK, Alam SK, Chakraborti PC, Dasgupta R, Chakravarty J, Ghatak UR, Kabiraj A, Biswas SG. Condensed cyclic and bridged-ring systems. Part 13. Synthesis of the insect attractant hydrocarbon, 9a-carbamorphinan, and X-ray structural analyses of 9a-carbamorphinan-10-one and 9a-carba-14α-morphinan-10-one Journal of the Chemical Society-Perkin Transactions 1. 17: 1243-1248. DOI: 10.1039/P19860001243  0.667
1986 Saha B, Bhattacharjee G, Ghatak UR. A novel synthetic method for angularly functionalized polycyclic systems by vinylogous wolff rearrangement of β, γ-unsaturated diazoketones Tetrahedron Letters. 27: 3913-3914. DOI: 10.1016/S0040-4039(00)83915-5  0.496
1986 SAHA B, BHATTACHARJEE G, GHATAK UR. ChemInform Abstract: A Novel Synthetic Method for Angularly Functionalized Polycyclic Systems by Vinylogous Wolff Rearrangement of β,γ-Unsaturated Diazoketones. Chemischer Informationsdienst. 17. DOI: 10.1002/chin.198650108  0.327
1986 CHAKRABORTI AK, ALAM SK, CHAKRABORTI PC, DASGUPTA R, CHAKRAVARTY J, GHATAK UR, KABIRAJ A, BISWAS SG. ChemInform Abstract: Condensed Cyclic and Bridged-Ring Systems. Part 13. Synthesis of the Insect Attractant Hydrocarbon, 9a-Carbamorphinan, and X-Ray Structural Analyses of 9a-Carbamorphinan-10-one and 9a-Carba-14α-morphinan-10-one. Chemischer Informationsdienst. 17. DOI: 10.1002/chin.198647375  0.621
1986 CHAKRABORTI AK, GHATAK UR. ChemInform Abstract: A Highly Effective Ligand-Bound Ruthenium Catalyst for Chemoselective Degradation of Aromatic Rings to Carboxylic Acids. Chemischer Informationsdienst. 17. DOI: 10.1002/chin.198617133  0.578
1986 DEB S, BHATTACHARJEE G, GHATAK UR. ChemInform Abstract: A Stereocontrolled Synthesis of (1′RS,2′SR)-3-Oxo-3′,4′-dihydrospiro[cyclopentane-1,1′(2′H)-naphthalene]-2′-ylacetic Acid and Its Methoxy Analogues. Chemischer Informationsdienst. 17. DOI: 10.1002/Chin.198615192  0.508
1986 DASGUPTA R, KANJILAL PR, PATRA SK, SARKAR M, GHATAK UR. ChemInform Abstract: Condensed Cyclic and Bridged-Ring Systems. Part 12. A Novel Synthetic Route to 4-p-Methoxyphenyl-bicyclo[2.2.2]octan-2-ones and Some Bicyclo[3.2.l]octane Derivatives by Acid-Catalyzed Intramolecular C-Alkylation and Rearrangement Reac Chemischer Informationsdienst. 17. DOI: 10.1002/Chin.198614158  0.532
1985 Chakraborti AK, Ghatak UR. A highly effective ligand-bound ruthenium catalyst for chemoselective degradation of aromatic rings to carboxylic acids Journal of the Chemical Society-Perkin Transactions 1. 17: 2605-2609. DOI: 10.1039/P19850002605  0.661
1985 Saha B, Roy SC, Satyanarayana GOSV, Ghatak UR, Seal A, Ray S, Bandyopadhyay R, Ghosh M, Das B, Basak BS. Acid-catalysed intramolecular C-alkylation in β,γ-unsaturated diazomethyl ketones. Part 4. Synthesis of functionalised hydrophenanthrene and benzocyclodecenone derivatives via novel fragmentation reactions, and X-ray structural analyses of two angularly substituted hydrophenanthrene derivatives Journal of the Chemical Society-Perkin Transactions 1. 505-513. DOI: 10.1039/P19850000505  0.704
1985 Chakraborti R, Ranu BC, Ghatak UR. A formylation-cyclization method of synthesis of cycloalkenones from unsaturated ketones. 2. Simple synthesis of some functionalized bicyclo[3.3.1]nonane derivatives The Journal of Organic Chemistry. 50: 5268-5271. DOI: 10.1021/Jo00225A054  0.712
1985 Dasgupta R, Kanjilal PR, Patra SK, Sarkar M, Ghatak UR. Condensed cyclic and bridged-ring systems : part 12 Tetrahedron. 41: 5619-5625. DOI: 10.1016/S0040-4020(01)91364-X  0.49
1985 Kanjilal PR, Sarkar M, Patra SK, Ghosh S, Ghatak UR. Synthetic studies toward complex diterpenoids. 16. A novel synthetic route to the carbocyclic skeleta of stemodin and stemarin by acid-catalyzed intramolecular C-alkylation and rearrangement reactions The Journal of Organic Chemistry. 50: 857-863. DOI: 10.1002/Chin.198533323  0.623
1985 DASGUPTA R, GHATAK UR. ChemInform Abstract: A SIMPLE SYNTHESIS OF α,β-UNSATURATED ALDEHYDES BY 1,3-CARBONYL TRANSPOSITION THROUGH ONE CARBON HOMOLOGATION Chemischer Informationsdienst. 16. DOI: 10.1002/chin.198530188  0.367
1985 SAHA B, ROY SC, SATYANARAYANA GOSV, GHATAK UR, SEAL A, RAY S, BANDYOPADHYAY R, GHOSH M, DAS B, BASAK BS. ChemInform Abstract: ACID-CATALYZED INTRAMOLECULAR C-ALKYLATION IN .beta±GAMMA.-UNSATURATED DIAZOMETHYL KETONES. PART 4. SYNTHESIS OF FUNCTIONALIZED HYDROPHENANTHRENE AND BENZOCYCLODECENONE DERIVATIVES VIA NOVEL FRAGMENTATION REACTIONS, AND X-RAY STRUCTUR Chemischer Informationsdienst. 16. DOI: 10.1002/Chin.198526092  0.676
1985 ROY SC, SARKAR M, GHATAK UR. ChemInform Abstract: CONDENSED CYCLIC AND BRIDGED-RING SYSTEMS: PART 11 - TWO SIMPLE SYNTHETIC ROUTES TOWARDS ATISANE DITERPENOIDS Chemischer Informationsdienst. 16. DOI: 10.1002/Chin.198521320  0.471
1984 Bhattacharjee G, Ghatak UR, Chakravarty AK. Condensed cyclic and bridged-ring systems. Part 10. Alumina-induced regioselective intramolecular alkylations of cis- and trans-4a-(2-methylsulphonyloxyethyl)-3,4,4a,9,10,10a-hexahydrophenanthren-2(1H)-ones Journal of the Chemical Society-Perkin Transactions 1. 15: 1515-1523. DOI: 10.1039/P19840001515  0.485
1984 Chakraborti AK, Ray JK, Kundu KK, Chakrabarty S, Mukherjee D, Ghatak UR. Regioselectivity in the intramolecular carbon–hydrogen insertion in metal-catalysed decomposition of some cis-1-methyl-3-arylcyclohexyl diazomethyl ketones. A highly efficient homogeneous nickel catalyst for carbenoid insertion Journal of the Chemical Society-Perkin Transactions 1. 15: 261-273. DOI: 10.1039/P19840000261  0.791
1984 BHATTACHARJEE G, GHATAK UR, CHAKRAVARTY AK. ChemInform Abstract: CONDENSED CYCLIC AND BRIDGED-RING SYSTEMS. PART 10. ALUMINA-INDUCED REGIOSELECTIVE INTRAMOLECULAR ALKYLATIONS OF CIS- AND TRANS-4A-(2-METHYLSULFONYLETHYL)-3,4,4A,9,10,10A-HEXAHYDROPHENANTHREN-2(1H)-ONES Chemischer Informationsdienst. 15. DOI: 10.1002/chin.198442150  0.427
1984 CHAKRABORTI AK, RAY JK, KUNDU KK, CHAKRABARTY S, MUKHERJEE D, GHATAK UR. ChemInform Abstract: Regioselectivity in the Intramolecular Carbon-Hydrogen Insertion in Metal-catalysed Decomposition of Some cis-1-Methyl-3-arylcyclohexyl Diazomethyl Ketones. A Highly Efficient Homogeneous Nickel Catalyst for Carbenoid Insertion. Chemischer Informationsdienst. 15. DOI: 10.1002/chin.198420116  0.568
1984 SINHA G, MAJI SK, GHATAK UR, MUKHERJEE M, MUKHERJEE AK, CHAKRAVARTY AK. ChemInform Abstract: CONDENSED CYCLIC AND BRIDGED-RING SYSTEM. PART 9. STEREOCONTROLLED SYNTHESIS AND X-RAY STRUCTURAL ANALYSES OF CIS-3,4,4A,9,10,10A-HEXAHYDRO-1,4A-ETHANOPHENANTHRENE-2(1H),12-DIONE AND TRANS-3,4,4A,9,10,10A-HEXAHYDRO-3,4A-ETHANOPHENANTH Chemischer Informationsdienst. 15. DOI: 10.1002/chin.198403179  0.398
1984 CHAKRABORTI AK, GHATAK UR. ChemInform Abstract: EXTENSION OF AN IMPROVED PROCEDURE FOR THE RUTHENIUM TETROXIDE-CATALYZED DEGRADATION OF AROMATIC RINGS: A HIGHLY EFFICIENT AND STEREOCONTROLLED SYNTHESIS OF FUNCTIONALIZED BRIDGED-RING AND CARBOCYCLIC ESTERS Chemischer Informationsdienst. 15. DOI: 10.1002/chin.198401188  0.626
1983 Chakraborti AK, Ghatak UR. Extension of an Improved Procedure for the Ruthenium Tetroxide-Catalyzed Degradation of Aromatic Rings: A Highly Efficient and Stereocontrolled Synthesis of Functionalized Bridged-Ring and Carbocyclic Esters Synthesis. 1983: 746-748. DOI: 10.1055/S-1983-30498  0.662
1983 Sinha G, Maji SK, Ghatak UR, Mukherjee M, Mukherjee AK, Chakravarty AK. Condensed cyclic and bridged-ring system. Part 9. Stereocontrolled synthesis and X-ray structural analyses of cis-3,4,4a,9,10,10a-hexahydro-1,4a-ethanophenanthrene-2(1H),12-dione and trans-3,4,4a,9,10,10a-hexahydro-3,4a-ethanophenanthrene-2(1H), 12-dione Journal of the Chemical Society-Perkin Transactions 1. 15: 2519-2528. DOI: 10.1039/P19830002519  0.486
1983 GUPTA RD, RANU BC, GHATAK UR. ChemInform Abstract: A Highly Efficient Synthesis of Functionalised Bridged-Cycloalkenones from γ,δ-Unsaturated Methyl Ketones by a Modified Formylation-Cyclisation Route. Chemischer Informationsdienst. 14. DOI: 10.1002/chin.198352150  0.69
1983 ROY SC, GHATAK UR. ChemInform Abstract: A CONVENIENT SYNTHESIS OF 1,2,3,4-TETRAHYDRO-1-METHYLFLUORENE-1-CARBOXYLIC ACIDS USING A PHOTOCYCLIZATION METHOD AND A STEREOCHEMICALLY DEFINED SYNTHESIS OF THE RACEMATES OF 1,2,3,4,4A,9A-HEXAHYDRO-6-METHOXY-1-METHYLFLUORENE-1-CARBOXY Chemischer Informationsdienst. 14. DOI: 10.1002/chin.198337188  0.669
1983 SATYANARAYANA GOSV, ROY SC, GHATAK UR. ChemInform Abstract: ACID-CATALYZED INTRAMOLECULAR C-ALKYLATION IN β,Γ-UNSATURATED DIAZOMETHYL KETONES. 2. A SIMPLE NEW SYNTHETIC ROUTE TO OCTAHYDRO-4,10A-ETHANOPHENANTHREN-12-ONES AND OCTAHYDROPENTALENO(6A,1-A)NAPHTHALEN-4-ONES Chemischer Informationsdienst. 14. DOI: 10.1002/chin.198321195  0.673
1983 ROY SC, SATYANARAYANA GOSV, GHATAK UR. ChemInform Abstract: ACID-CATALYZED INTRAMOLECULAR C-ALKYLATION IN β,Γ-UNSATURATED DIAZOMETHYL KETONES. 3. A SIMPLE SYNTHETIC ROUTE TO HEXAHYDRO-4,9A-ETHANO-1H-FLUOREN-11-ONES, HEXAHYDRO-6H-PENTALENO(6A,1-A)INDAN-4-ONES AND HEXAHYDROCYCLOBUTA(J)FLUOREN-2( Chemischer Informationsdienst. 14. DOI: 10.1002/chin.198321193  0.655
1982 Ranu BC, Sarkar M, Chakraborti PC, Ghatak UR. Synthetic studies directed towards complex diterpenoids. Part 15. Synthesis and stereochemistry of the catalytic reduction of Δ4b(5)-gibbenes and related compounds Journal of the Chemical Society-Perkin Transactions 1. 13: 865-873. DOI: 10.1039/P19820000865  0.757
1982 Ghatak U, Sanyal B, Ghosh S, Sarkar M, Raju M, Wenkert E. Additions and Corrections - A Formylation-Cyclization Method of Synthesis of Cycloalkenones from Unsaturated Ketones The Journal of Organic Chemistry. 47: 5426-5426. DOI: 10.1021/Jo00148A603  0.695
1982 Roy SC, Satyanarayana GOSV, Ghatak UR. Acid-catalyzed intramolecular C-alkylation in .beta.,.gamma.-unsaturated diazomethyl ketones. 3. A simple synthetic route to hexahydro-4,9a-ethano-1H-fluoren-11-ones, hexahydro-6H-pentaleno[6a,1-a]indan-4-ones and hexahydrocyclobuta[j]fluoren-2(1H)-ones The Journal of Organic Chemistry. 47: 5361-5368. DOI: 10.1021/Jo00148A023  0.653
1982 Satyanarayana GOSV, Roy SC, Ghatak UR. Acid-catalyzed intramolecular C-alkylation in .beta.,.gamma.-unsaturated diazomethyl ketones. 2. A simple new synthetic route to octahydro-4,10a-ethanophenanthren-12-ones and octahydropentaleno[6a,1-a]naphthalen-4-ones The Journal of Organic Chemistry. 47: 5353-5361. DOI: 10.1021/Jo00148A022  0.682
1982 RANU BC, SARKAR M, CHAKRABORTI PC, GHATAK UR. ChemInform Abstract: SYNTHETIC STUDIES DIRECTED TOWARDS COMPLEX DITERPENOIDS. PART 15. SYNTHESIS AND STEREOCHEMISTRY OF THE CATALYTIC REDUCTION OF Δ4B(5)-GIBBENES AND RELATED COMPOUNDS Chemischer Informationsdienst. 13. DOI: 10.1002/chin.198224195  0.653
1982 KANJILAL PR, ALAM SK, GHATAK UR. ChemInform Abstract: AN IMPROVED TOTAL SYNTHESIS OF (.+-.)-PODOCARPIC ACID BY A CYCLOALKYLATION ROUTE Chemischer Informationsdienst. 13. DOI: 10.1002/chin.198217167  0.417
1981 Kanjilal PR, Alam SK, Ghatak UR. An Improved Total Synthesis of (±) - Podocarpic Acid by a Cyclialkylation Route Synthetic Communications. 11: 795-802. DOI: 10.1080/00397918108065658  0.48
1981 Ghatak UR, Sanyal B, Satyanarayana GOSV, Ghosh S. Acid-catalysed intramolecular C-alkylation in βγ-unsaturated diazomethyl ketones. A new synthetic route to angularly fused cyclobutanones, bridged cyclopentanones, and γ-lactones Journal of the Chemical Society-Perkin Transactions 1. 12: 1203-1212. DOI: 10.1039/P19810001203  0.6
1981 Satyanarayana GOSV, Kanjilal PR, Ghatak UR. Acid-catalysed intramolecular C-alkylation rearrangements of βγ-unsaturated diazomethyl ketones. A noval synthetic entry to pentaleno-annelated polycyclic systems Journal of the Chemical Society, Chemical Communications. 746-747. DOI: 10.1039/C39810000746  0.54
1981 Ghosh S, Ghatak UR. Novel synthetic route to angularly functionalized hydrofluorene derivatives by a regio- and stereospecific metalation-carbonation reaction The Journal of Organic Chemistry. 46: 1486-1490. DOI: 10.1021/Jo00320A051  0.531
1981 SATYANARAYANA GOSV, KANJILAL PR, GHATAK UR. ChemInform Abstract: ACID-CATALYZED INTRAMOLECULAR C-ALKYLATION REARRANGEMENTS OF βΓ-UNSATURATED DIAZOMETHYL KETONES. A NOVEL SYNTHETIC ENTRY TO PENTALENO-ANNULATED POLYCYCLIC SYSTEMS Chemischer Informationsdienst. 12. DOI: 10.1002/Chin.198150165  0.541
1981 GHOSH S, GHATAK UR. ChemInform Abstract: NOVEL SYNTHETIC ROUTE TO ANGULARLY FUNCTIONALIZED HYDROFLUORENE DERIVATIVES BY A REGIO- AND STEREOSPECIFIC METALATION-CARBONATION REACTION Chemischer Informationsdienst. 12. DOI: 10.1002/chin.198133210  0.33
1981 GHATAK UR, SANYAL B, SATYANARAYANA GOSV, GHOSH S. ChemInform Abstract: ACID-CATALYZED INTRAMOLECULAR C-ALKYLATION IN βΓ-UNSATURATED DIAZOMETHYL KETONES. A NEW SYNTHETIC ROUTE TO ANGULARLY FUSED CYCLOBUTANONES, BRIDGED CYCLOPENTANONES, AND Γ-LACTONES Chemischer Informationsdienst. 12. DOI: 10.1002/chin.198127102  0.483
1981 GHATAK UR, ROY SC. ChemInform Abstract: SYNTHETIC STUDIES TOWARDS COMPLEX DITERPENOIDS. PART 14. STEREOCONTROLLED SYNTHESES OF POTENTIAL TETRACYCLIC INTERMEDIATES EN ROUTE TO HIBAENE THROUGH INTRAMOLECULAR ALKYLATIONS OF Γ,Δ-UNSATURATED α′-DIAZOMETHYL KEKTONES Chemischer Informationsdienst. 12. DOI: 10.1002/chin.198116216  0.65
1981 GHATAK UR, GHOSH S, SANYAL B. ChemInform Abstract: SYNTHETIC STUDIES TOWARDS COMPLEX DITERPENOIDS. PART 13. STEREOSPECIFIC SYNTHESIS OF INTERMEDIATES TO THE DITERPENE ALKALOIDS AND THE C20-GIBBERELLINS BY A NOVEL REARRANGEMENT OF ANGULARLY FUSED CYCLOBUTANONES Chemischer Informationsdienst. 12. DOI: 10.1002/chin.198111318  0.45
1980 Ghatak UR, Ghosh S, Sanyal B. Synthetic studies towards complex diterpenoids. Part 13. Stereo-specific synthesis of intermediates to the diterpene alkaloids and the C20-gibberellins by a novel rearrangement of angularly fused cyclo-butanones Journal of the Chemical Society-Perkin Transactions 1. 12: 2881-2886. DOI: 10.1039/P19800002881  0.613
1980 Ghosh S, Dasgupta R, Chakravarty J, Ghatak UR. Synthetic studies towards complex diterpenoids. Part 11. Stereochemically defined synthesis of the racemates of 1,2,3,4,4a,9a-hexahydro-7-methoxy-1-methylfluorene-1-carboxylic acid Journal of the Chemical Society-Perkin Transactions 1. 11: 804-808. DOI: 10.1039/P19800000804  0.591
1980 Ghatak UR, Sanyal B, Ghosh S, Sarkar M, Raju MS, Wenkert E. A formylation-cyclization method of synthesis of cycloalkenones from unsaturated ketones The Journal of Organic Chemistry. 45: 1081-1085. DOI: 10.1021/jo01294a031  0.579
1980 Ghatak UR, Sanyal B, Ghosh S, Sarkar M, Raju MS, Wenkert E. A formylation-cyclization method of synthesis of cycloalkenones from unsaturated ketones Journal of Organic Chemistry. 45: 1081-1085. DOI: 10.1021/Jo01294A031  0.701
1980 GHOSH S, DASGUPTA R, CHAKRAVARTY J, GHATAK UR. ChemInform Abstract: SYNTHETIC STUDIES TOWARD COMPLEX DITERPENOIDS. PART 11. STEREOCHEMICALLY DEFINED SYNTHESIS OF THE RACEMATES OF 1,2,3,4,4A,9A-HEXAHYDRO-7-METHOXY-1-METHYLFLUORENE-1-CARBOXYLIC ACID Chemischer Informationsdienst. 11. DOI: 10.1002/chin.198020159  0.463
1980 GHATAK UR, CHAKRABORTI PC. ChemInform Abstract: SYNTHETIC STUDIES TOWARD COMPLEX DITERPENOIDS. STEREOCONTROLLED TOTAL SYNTHESIS OF SOME GIBBANE SYNTHONS AND DEGRADATION PRODUCTS OF GIBBERELLINS Chemischer Informationsdienst. 11. DOI: 10.1002/chin.198014330  0.391
1979 VanderMeer RK, Ghatak UR, Alam SK, Chakraborti PC. (±)-Des-N-Morphinan: a Unique Bridged Hydrocarbon Attractant for the Rhinoceros Beetle, Oryctes rhinoceros ; 1 and Development of an Olfactometer Environmental Entomology. 8: 6-10. DOI: 10.1093/Ee/8.1.6  0.356
1979 Ghatak UR, Chatterjee NR, Sanyal B. Condensed cyclic and bridged-ring systems. 8. Factors influencing the stereochemistry of the products in the acid-catalyzed cycloalkylation reactions of some substituted .beta.-phenylethylcyclohexene and -cyclohexanol derivatives The Journal of Organic Chemistry. 44: 1992-1999. DOI: 10.1021/Jo01326A022  0.487
1979 Ghatak UR, Chakraborti PC. Synthetic studies toward complex diterpenoids. Stereocontrolled total synthesis of some gibbane synthons and degradation products of gibberellins The Journal of Organic Chemistry. 44: 4562-4566. DOI: 10.1021/Jo00393A022  0.458
1979 GHATAK UR, CHATTERJEE NR, SANYAL B. ChemInform Abstract: CONDENSED CYCLIC AND BRIDGED-RING SYSTEMS. 8. FACTORS INFLUENCING THE STEREOCHEMISTRY OF THE PRODUCTS IN THE ACID-CATALYZED CYCLOALKYLATION REACTIONS OF SOME SUBSTITUTED β-PHENYLETHYLCYCLOHEXENE AND -CYCLOHEXANOL DERIVATIVES Chemischer Informationsdienst. 10. DOI: 10.1002/chin.197941112  0.443
1979 GHATAK UR, ALAM SK, RAY JK. ChemInform Abstract: SYNTHETIC STUDIES TOWARD COMPLEX DITERPENOIDS. 10. STEREOCONTROLLED TOTAL SYNTHESIS OF (.+-.)-19α,20α-(ACETYLIMINO)-12-HYDROXY-5β,10α-PODOCARPA# -8,11,13-TRIENE, A DEGRADATION PRODUCT OF ATISINE Chemischer Informationsdienst. 10. DOI: 10.1002/Chin.197915360  0.706
1979 GHOSH S, CHAKRABARTY S, GHATAK UR. ChemInform Abstract: PROXIMITY EFFECTS: AN UNPRECEDENTED EXAMPLE OF DIECKMANN CYCLIZATION IN AQUEOUS METHANOLIC POTASSIUM AND SODIUM HYDROXIDES Chemischer Informationsdienst. 10. DOI: 10.1002/Chin.197905085  0.436
1978 Ghatak UR, Alam SK, Ray JK. Synthetic studies toward complex diterpenoids. 10. Stereocontrolled total synthesis of (.+-.)-19.alpha.,20.alpha.-(acetylimino)-12-hydroxy-5.beta.,10.alpha.-podocarpa-8,11,13-triene, a degradation product of atisine The Journal of Organic Chemistry. 43: 4598-4604. DOI: 10.1021/Jo00418A012  0.673
1978 Ghatak U, Sarkar M, Patra SK. Angular alkylation through a novel intramolecular cationic cyclization reaction. A simple stereospecific route to polycyclic bridged-ring intermediates towards some complex diterpenoids Tetrahedron Letters. 19: 2929-2932. DOI: 10.1016/S0040-4039(01)94902-0  0.506
1978 GHATAK UR, SARKAR M, PATRA SK. ChemInform Abstract: ANGULAR ALKYLATION THROUGH A NOVEL INTRAMOLECULAR CATIONIC CYCLIZATION REACTION. A SIMPLE STEREOSPECIFIC ROUTE TO POLYCYCLIC BRIDGED-RING INTERMEDIATES TOWARDS SOME COMPLEX DITERPENOIDS Chemischer Informationsdienst. 9. DOI: 10.1002/chin.197845313  0.438
1977 Ghatak UR, Ray JK. Condensed cyclic and bridged-ring systems. Part 6. Stereochemically defined synthesis of (±)-3-methoxy-17,18,19,20-tetranor-B-homophylloclada-1(10),2,4-triene-16-one through intramolecular alkylation of a γδ-unsaturated α′-diazomethyl ketone Journal of the Chemical Society-Perkin Transactions 1. 8: 518-520. DOI: 10.1039/P19770000518  0.757
1977 Chakravarty J, Dasgupta R, Ray JK, Ghatak UR. Condensed cyclic and bridged-ring systems. VII. Acid-catalysed cyclisation of methyl substituted benzylcyclohexanols. Factors influencing the nature of cyclisation products Proceedings of the Indian Academy of Sciences - Section A. 86: 317-325. DOI: 10.1007/BF03046846  0.475
1977 GHATAK UR, RAY JK. ChemInform Abstract: Condensed Cyclic and Bridged-ring Systems. Part 6. Stereochemically Defined Synthesis of (±)-3-Methoxy-17,18,19,20-tetranor-B-homophylloclada-1(l0),2,4-triene-16-one Through Intramolecular Alkylation of a γδ-Unsaturated α-Diazomethyl Chemischer Informationsdienst. 8: no-no. DOI: 10.1002/chin.197720226  0.435
1976 Ghatak UR, Ray JK, Chakrabarty S. Condensed cyclic and bridged-ring systems. Part V.<sup>1</sup> Application of the interamolecular oxo-carbenoid insertion reaction to the preparation of two new bridged-ring ketones Journal of the Chemical Society, Perkin Transactions 1. 1975-1976. DOI: 10.1039/P19760001975  0.755
1976 Ghatak UR, Alam SK, Chakraborti PC, Ranu BC. Condensed cyclic and bridged-ring systems. Part IV. Stereochemically controlled synthesis of some endo-2-aryl-6-oxobicyclo[3.2.1]octanes and related compounds through intramolecular alkylations of γδ-unsaturated α′-diazomethyl ketones Journal of the Chemical Society-Perkin Transactions 1. 7: 1669-1673. DOI: 10.1039/P19760001669  0.76
1976 Ghatak UR, Chakrabarty S. Synthetic studies toward complex diterpenoids. IX. New stereocontrolled synthetic route to some intermediates for diterpenoid alkaloids and C20 gibberellins The Journal of Organic Chemistry. 41: 1089-1094. DOI: 10.1021/Jo00869A002  0.452
1976 Ghatak UR, Sanyal B, Ghosh S. A novel rearrangement of angularly fused cyclobutanone. Stereospecific syntheses of intermediates to the diterpene alkaloids and the C20 gibberellins Journal of the American Chemical Society. 98: 3721-3722. DOI: 10.1021/Ja00428A063  0.591
1976 GHATAK UR, RAY JK, CHAKRABARTY S. ChemInform Abstract: CONDENSED CYCLIC AND BRIDGED-RING SYSTEMS. PART V. APPLICATION OF THE INTRAMOLECULAR OXO-CARBENOID INSERTION REACTION TO THE PREPARATION OF TWO NEW BRIDGED-RING KETONES Chemischer Informationsdienst. 7: no-no. DOI: 10.1002/chin.197652200  0.406
1976 GHATAK UR, ALAM SK, CHAKRABORTI PC, RANU BC. ChemInform Abstract: CONDENSED CYCLIC AND BRIDGED-RING SYSTEMS. PART IV. STEREOCHEMICALLY CONTROLLED SYNTHESIS OF SOME ENDO-2-ARYL-6-OXOBICYCLO(3.2.1)OCTANES AND RELATED COMPOUNDS THROUGH INTRAMOLECULAR ALKYLATIONS OF ΓΔ-UNSATURATED α′-DIAZOMETHYL KETONES Chemischer Informationsdienst. 7: no-no. DOI: 10.1002/chin.197649181  0.682
1976 GHATAK UR, SANYAL B, GHOSH S. ChemInform Abstract: A NOVEL REARRANGEMENT OF ANGULARLY FUSED CYCLOBUTANONE. STEREOSPECIFIC SYNTHESES OF INTERMEDIATES TO THE DITERPENE ALKALOIDS AND THE C20 GIBBERELLINS Chemischer Informationsdienst. 7: no-no. DOI: 10.1002/chin.197636100  0.422
1976 GHATAK UR, CHAKRABARTY S. ChemInform Abstract: SYNTHETIC STUDIES TOWARD COMPLEX DITERPENOIDS. IX. NEW STEREOCONTROLLED SYNTHETIC ROUTE TO SOME INTERMEDIATES FOR DITERPENOID ALKALOIDS AND C20 GIBBERELLINS Chemischer Informationsdienst. 7: no-no. DOI: 10.1002/chin.197630331  0.384
1976 GHATAK UR, CHAKRAVARTY J, DASGUPTA R, CHAKRABORTI PC. ChemInform Abstract: CONDENSED CYCLIC AND BRIDGED-RING-SYS Chemischer Informationsdienst. 7: no-no. DOI: 10.1002/Chin.197610081  0.466
1975 Chakrabarty S, Ray JK, Mukherjee D, Ghatak UR. Regioselective intramolecular carbon-hydrogen insertion in copper-catalyzed carbenoid decompositions of cis-l-methyl-3-arylcyclohexane-l-diazombthyl ketones : Some synthetic applications Synthetic Communications. 5: 275-281. DOI: 10.1080/00397917508064121  0.763
1975 Ghatak UR, Chakravarty J, Dasgupta R, Chakraborti PC. Condensed cyclic and bridged-ring systems. Part III. Regioselectivity and stereoselectivity in the acid-catalysed cyclisations of substituted benzylcyclohexanols. Stereocontrolled synthesis of some gem-carboxy–methyl-substituted hexahydrofluorene and hexahydro-5,9-methanobenzocyclo-octene derivatives Journal of the Chemical Society-Perkin Transactions 1. 2438-2445. DOI: 10.1039/P19750002438  0.553
1975 CHAKRABARTY S, RAY JK, MUKHERJEE D, GHATAK UR. ChemInform Abstract: REGIOSELECTIVE INTRAMOLECULAR CARBON-HYDROGEN INSERTION IN COPPER-CATALYZED CARBENOID DECOMPOSITIONS OF CIS-1-METHYL-3-ARYLCYCLOHEXANE-1-DIAZOMETHYL KETONES, SOME SYNTHETIC APPLICATIONS Chemischer Informationsdienst. 6: no-no. DOI: 10.1002/chin.197543203  0.385
1975 GHATAK UR, SANYAL B. ChemInform Abstract: INTRAMOLECULAR C-ALKYLATION IN BETA,GAMMA-UNSATURATED DIAZO KETONES, A NEW SYNTHETIC ROUTE TO ANGULARLY FUSED CYCLOBUTANONES AND GAMMA-LACTONES Chemischer Informationsdienst. 6: no-no. DOI: 10.1002/chin.197506243  0.358
1974 Ghatak UR, Chakrabarty S, Rudra K. Synthetic studies towards complex diterpenoids. Part VIII. Stereo-controlled synthesis of (±)-2-methoxy-11β-methyl-4bαH-gibba-1(10a),2,4-trien-8-one and related compounds through intramolecular alkylations of γδ-unsaturated α′-diazomethyl ketones Journal of the Chemical Society-Perkin Transactions 1. 1957-1961. DOI: 10.1039/P19740001957  0.503
1974 Ghatak UR, Sanyal B. Intramolecular C-alkylation in βγ-unsaturated diazo ketones: a new synthetic route to angularly fused cyclobutanones and γ-lactones Journal of the Chemical Society, Chemical Communications. 876-877. DOI: 10.1039/C39740000876  0.547
1974 Ghatak U, Dasgupta R, Chakravarty J. Synthetic studies towards complex diterpenoids—VII Tetrahedron. 30: 187-194. DOI: 10.1016/S0040-4020(01)97234-5  0.541
1974 GHATAK UR, CHAKRABARTY S, RUDRA K. ChemInform Abstract: SYNTHETIC STUDIES TOWARDS COMPLEX DITERPENOIDS PART 8, STEREOCONTROLLED SYNTHESIS OF (+-)-2-METHOXY-11BETA-METHYL-4B ALPHA H-GIBBA-1(10A)2,4-TRIEN-8-ONE AND RELATED COMPOUNDS THROUGH INTRAMOLECULAR ALKYLATIONS OF GAMMA,DELTA-UNSATURED Chemischer Informationsdienst. 5: no-no. DOI: 10.1002/Chin.197447471  0.508
1974 GHATAK UR, DASGUPTA R, CHAKRAVARTY J. ChemInform Abstract: SYNTHETIC STUDIES TOWARDS COMPLEX DITERPENOIDS PART 7, STEREOSELECTIVE SYNTHESIS AND CONFOMATIONAL ANALYSIS OF ALL FOUR POSSIBLE RACEMATES OF 1,2,3,4,4A,9A-HEXAHYDRO-1-METHYLFLUORENE-1-CARBOXYLIC ACIDS Chemischer Informationsdienst. 5: no-no. DOI: 10.1002/chin.197419133  0.465
1973 Ghatak UR, Charkraborti PC, Ranu BC, Sanyal B. Intramolecular keto-carbenoid addition to double bonds: stereochemistry of the catalytic reduction of Δ9(11)-gibbenes and related compounds Journal of the Chemical Society, Chemical Communications. 548-549. DOI: 10.1039/C39730000548  0.558
1973 GHATAK UR, CHAKRABORTI PC, RANU BC, SANYAL B. ChemInform Abstract: INTRAMOLECULAR KETO-CARBENOID ADDITION TO DOUBLE BONDS, STEREOCHEMISTRY OF THE CATALYTIC REDUCTION OF DELTA(9(11))-GIBBENES AND RELATED COMPOUNDS Chemischer Informationsdienst. 4: no-no. DOI: 10.1002/Chin.197344266  0.72
1972 Kovacs J, Kalita C, Ghatak UR. Synthesis of polyglutathione, polyasparthione, and related sequential polypeptides. The Journal of Organic Chemistry. 37: 30-4. PMID 5007354 DOI: 10.1021/Jo00966A008  0.463
1972 Kovacs J, Kapoor A, Ghatak UR, Mayers GL, Giannasio VR, Giannotti R, Senyk G, Nitecki DE, Goodman JW. Synthesis of poly -glutamyl- -aminobutyric acids and their reactivity with antiserum against Bacillus anthracis polypeptide. Biochemistry. 11: 1953-8. PMID 4112621 DOI: 10.1021/Bi00760A033  0.47
1972 Ghatak UR, Chakrabarty S. Angular alkylation through intramolecular carbenoid insertion. New stereocontrolled route to synthetic intermediates to the diterpene alkaloids and C20-gibberellins Journal of the American Chemical Society. 94: 4756-4758. DOI: 10.1021/Ja00768A068  0.502
1972 Chakrabortty P, Dasgupta R, Dasgupta S, Ghosh S, Ghatak U. Synthetic studies towards complex diterpenoids—VI Tetrahedron. 28: 4653-4665. DOI: 10.1016/0040-4020(72)80046-2  0.58
1972 CHAKRABORTTY PN, DASGUPTA R, DASGUPTA SK, GHOSH SR, GHATAK UR. ChemInform Abstract: SYNTH. IN RICHTUNG AUF KOMPLEXE DITERPENOIDE 6. MITT. NEUE SYNTH.-WEGE ZU TETRACYCLISCHEN, BICYCLO(3,2,1)OCTAN ENTHALTENDEN ZWISCHENPRODUKTEN DURCH INTRAMOLEKULARE ALKYLIERUNGSRK. DER VON GAMMA,DELTA-UNGESAETTIGTEN HYDROAROMATISCHEN S Chemischer Informationsdienst. 3: no-no. DOI: 10.1002/Chin.197249189  0.346
1972 GHATAK UR, CHAKRABARTY S. ChemInform Abstract: ANGULARE ALKYLIERUNG DURCH INTRAMOLEKULARE CARBENOIDINSERTION, NEUER STEREOKONTROLLIERTER WEG ZU SYNTHETISCHEN ZWISCHENPRODUKTEN FUER DITERPEN-ALKALOIDE UND C20-GIBBERELLINEN Chemischer Informationsdienst. 3: no-no. DOI: 10.1002/Chin.197238365  0.412
1972 KOVACS J, KALITA C, GHATAK UR. ChemInform Abstract: SYNTH. VON POLYGLUTATHION, POLYASPARTHION UND AEHNLICHEN POLYPEPTIDEN MIT SEQUENZ-AUFBAU Chemischer Informationsdienst. 3: no-no. DOI: 10.1002/Chin.197215424  0.386
1971 Ghatak UR, Chatterjee NR. A total synthesis of (±)-O-methyl-14-methylpodocarpic acid Journal of the Chemical Society C: Organic. 190-196. DOI: 10.1039/J39710000190  0.449
1971 Johnson L, Chakravarty J, Dasgupta R, Ghatak U. Application in the use of a shift reagent in proton magnetic resonance spectroscopy for the elucidation of structures and stereochemistry of epimeric methyl 4,9-dimethyl-7, 8-benzobicyclo (3.3.1)non-7-ene-4-carboxylates Tetrahedron Letters. 12: 1703-1708. DOI: 10.1016/S0040-4039(01)87439-6  0.375
1971 GHATAK UR, CHATTERJEE NR. ChemInform Abstract: SYNTH.-UNTERSUCHUNGEN ZU KOMPLEXEN DITERPENOIDEN 5. MITT. STEREOSELEKTIVE TOTALSYNTH. ALLER VIER RACEMATE VON 1-CARBOXY-1-METHYL-7-METHOXY-1,2,3,4,9,10,11,12-OKTAHYDROPHENANTHREN Chemischer Informationsdienst. Organische Chemie. 2: no-no. DOI: 10.1002/chin.197148254  0.334
1971 GHATAK UR, CHATTERJEE NR. ChemInform Abstract: TOTALSYNTH. VON (+-)-O-METHYL-14-METHYL-ISODOCARPSAEURE Chemischer Informationsdienst. Organische Chemie. 2: no-no. DOI: 10.1002/Chin.197112301  0.385
1970 Kovacs J, Mayers GL, Johnson RH, Cover RE, Ghatak UR. Racemization of amino acid derivatives. Rate of racemization and peptide bond formation of cysteine active esters. The Journal of Organic Chemistry. 35: 1810-5. PMID 5446982 DOI: 10.1021/Jo00831A021  0.422
1970 Moore RE, Ghatak UR, Chakravarty J, Dasgupta R, Johnson LF. Mass spectrometry and proton and carbon-13 nuclear magnetic resonance spectroscopy in assigning stereochemistry to derivatives of des-N-morphinan and des-N-isomorphinan Journal of the Chemical Society D: Chemical Communications. 1136-1138. DOI: 10.1039/C29700001136  0.463
1970 Kovacs J, Mayers GL, Johnson RH, Cover RE, Ghatak UR. Rates of racemization and coupling of cysteine active ester derivatives Journal of the Chemical Society D: Chemical Communications. 53-54. DOI: 10.1039/C29700000053  0.408
1970 KOVACS J, MAYERS GL, JOHNSON RH, COVER RE, GHATAK UR. ChemInform Abstract: RACEMISIERUNG VON AMINOSAEUREDERIVATEN, GESCHWINDIGKEITEN DER RACEMISIERUNG UND BLDG. DER PEPTID-BINDUNG BEI AKTIVEN CYSTEINESTERN Chemischer Informationsdienst. Organische Chemie. 1: no-no. DOI: 10.1002/Chin.197038397  0.324
1970 GHATAK UR, CHATTERJEE NR, BANERJEE AK, CHAKRAVARTY J, MOORE RE. ChemInform Abstract: SYNTH. UND KONFORM.-ANALYSE TRICYCLISCHER ANALOGA VON RING-C-AROMATISCHEN 20-NOR-DITERPEN-HARZSAEURE-ANALOGA Chemischer Informationsdienst. Organische Chemie. 1: no-no. DOI: 10.1002/Chin.197013231  0.564
1970 DASGUPTA SK, DASGUPTA R, GHOS SR, GHATAK UR. ChemInform Abstract: VERBRUECKTES BICYCLO(3,2,1)OCTANRINGSYST. DURCH INTRAMOLEKULARE CARBENEINSCHIEBUNGSRK. NEUER SYNTHETISCHER ZUGANG ZU TETRACYCLISCHEN DITERPENOIDEN Chemischer Informationsdienst. Organische Chemie. 1: no-no. DOI: 10.1002/Chin.197003199  0.414
1969 Dasgupta SK, Dasgupta R, Ghosh SR, Ghatak UR. Bridged bicyclo[3,2,1]octane ring system by intramolecular carbene insertion reaction: a new synthetic approach to tetracyclic diterpenoids Journal of the Chemical Society D: Chemical Communications. 1253-1253. DOI: 10.1039/C29690001253  0.486
1969 Ghatak UR, Chatterjee NR, Banerjee AK, Chakravarty J, Moore RE. Synthesis and conformational analysis of tricyclic ring-C aromatic 20-norditerpenoid resin acid analogs The Journal of Organic Chemistry. 34: 3739-3749. DOI: 10.1021/Jo01264A003  0.614
1968 Kovacs J, Schmit GN, Ghatak UR. Polypeptides with known repeating sequences of amino acids. Comparison of several methods used for the synthesis of poly-gamma-D- and L-glutamylglycine and investigation of its serological reaction with antianthrax immune serum. Biopolymers. 6: 817-36. PMID 5654615 DOI: 10.1002/Bip.1968.360060606  0.37
1968 Kovacs J, Mayers GL, Johnson RH, Ghatak UR. Racemization studies in peptide chemistry. Re-investigation of the “β-elimination–readdition” mechanism of N-benzyloxycarbonyl-S-benzylcysteine derivatives Chemical Communications (London). 1066-1067. DOI: 10.1039/C19680001066  0.341
1968 Ghatak U, Chatterjee N. A total synthesis of (pm)- sempervirol acetate Tetrahedron Letters. 9: ii. DOI: 10.1016/S0040-4039(00)89583-0  0.366
1968 Ghatak U, Chakravarty J, Banerjee A. Synthetic studies directed to gibberellins and related compounds Tetrahedron. 24: 1577-1593. DOI: 10.1016/S0040-4020(01)82464-9  0.557
1967 Ghatak UR, Chakravarty J, Banerjee AK, Chatterjee NR. Proximity effects. The stereochemistry of the lithium–ammonia reduction of cyclic styrenoid systems containing a neighbouring carboxylic acid group Chemical Communications (London). 217-218. DOI: 10.1039/C19670000217  0.417
1967 Ghatak U, Chatterjee N. A total synthesis of (±) - sempervirol acetate. Tetrahedron Letters. 8: 4783-4784. DOI: 10.1016/S0040-4039(01)89603-9  0.432
1967 Ghatak U, Banerjee A, Chatterjee N, Chakravarty J. Syntheses and stereochemistry of (±)-4α-methyl-10β-hydroxy--1,2,3,4,5,6,7,10-octahydrophenanthrene-4β-carboxylic acid lactone and the four epimers of (±)-4-methyl-1,2,3,4,5,6,7,10-octahydro-phenanthrene-4-carboxylic acid. Tetrahedron Letters. 8: 247-253. DOI: 10.1016/S0040-4039(00)90525-2  0.456
1966 Ghatak UR, Chakravarty J. Intramolecular participation by a neighbouring ketone group in ester hydrolysis Chemical Communications (London). 184-185. DOI: 10.1039/C19660000184  0.414
1966 Kovacs J, Ghatak UR. Investigation on the Sodium—Liquid Ammonia Cleavage of a Tosyl Protecting Group of Tosylamino Acids and Peptides1 The Journal of Organic Chemistry. 31: 119-121. DOI: 10.1021/jo01339a025  0.29
1966 Ghatak U, Chakravarty J. Acid-catalized cylisation of substituted benzylcyclohexanols. Factors influencing the nature of cyclisation products. Tetrahedron Letters. 7: 2449-2458. DOI: 10.1016/S0040-4039(00)75675-9  0.425
1965 Basu N, Ghatak U, Sengupta G, Dutta P. Synthesis studies on resin acids—VII Tetrahedron. 21: 2641-2652. DOI: 10.1016/S0040-4020(01)93920-1  0.481
1963 PETTIT G, DASGUPTA A, GHATAK U. Steroids and related natural products. XVI synthesis of oxaestranes Steroids. 1: 137-143. DOI: 10.1016/S0039-128X(63)80129-4  0.549
1962 Pettit G, Green B, Kasturi T, Ghatak U. Steroids and related natural products—X Tetrahedron. 18: 953-958. DOI: 10.1016/S0040-4020(01)92749-8  0.766
1961 Pettit G, Ghatak U, Green B, Kasturi T, Piatak D. Communications- Steroids and Related Natural Products. IV. Reduction of Lactones to Cyclic Ethers. The Journal of Organic Chemistry. 26: 1685-1686. DOI: 10.1021/Jo01064A644  0.502
1960 Ghatak UR, Datta DK, Ray SC. Synthetic Studies on Resin Acids. IV1 Journal of the American Chemical Society. 82: 1728-1734. DOI: 10.1021/Ja01492A048  0.407
1959 SEN K, GHATAK UR. Synthesis of Condensed Cyclic Systems. I.1New Synthesis of 7-Methylbicyclo-[3.3.0]octan-3-one and 8-Methylbicyclo[4.3.0]nonan-4-one The Journal of Organic Chemistry. 24: 1866-1869. DOI: 10.1021/Jo01094A008  0.486
1959 Ghatak UR. Stereochemistry of desoxypodocarpic acid isomers Tetrahedron Letters. 1: 19-23. DOI: 10.1016/S0040-4039(00)70286-3  0.423
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