| Year |
Citation |
Score |
| 2000 |
Bamford SJ, Luker T, Speckamp WN, Hiemstra H. Enantioselective formal total synthesis of roseophilin. Organic Letters. 2: 1157-60. PMID 10804578 DOI: 10.1021/Ol005750S |
0.565 |
|
| 1999 |
Ollero L, Mentink G, Rutjes FPJT, Speckamp WN, Hiemstra H. A Kulinkovich entry into tertiary N-acyliminium ion chemistry Organic Letters. 1: 1331-1334. DOI: 10.1021/Ol990866D |
0.511 |
|
| 1999 |
Karstens WFJ, Moolenaar MJ, Rutjes FPJT, Grabowska U, Speckamp WN, Hiemstra H. Application of an organozinc reagent derived from (S)-pyroglutamic acid: A formal synthesis of epibatidine Tetrahedron Letters. 40: 8629-8632. DOI: 10.1016/S0040-4039(99)01808-0 |
0.607 |
|
| 1998 |
De Koning H, Hiemstra H, Moolenaar MJ, Speckamp WN. New applications of N-acyliminium precursors: Tetracarbonyliron-mediated stereoselective alkylations of 5-(R)-isopropoxy-3-pyrrolin-2-ones European Journal of Organic Chemistry. 1729-1737. |
0.497 |
|
| 1998 |
Luker T, Koot WJ, Hiemstra H, Speckamp WN. Michael Additions to (R)-1-Acetyl-5-isopropoxy-3-pyrrolin-2-one and Subsequent N-Acyliminium Ion Generation: Synthesis of Enantiopure 1-Azabicycles and Preparation of an Intermediate for a Projected Synthesis of Roseophilin Journal of Organic Chemistry. 63: 220-221. |
0.561 |
|
| 1997 |
Luker T, Hiemstra H, Speckamp WN. Synthesis and Further Reactivity of Functionalized Lactam-Derived Enol Triflates. The Journal of Organic Chemistry. 62: 8131-8140. PMID 11671922 DOI: 10.1021/Jo971192S |
0.597 |
|
| 1997 |
Ostendorf M, Romagnoli R, Pereiro IC, Roos EC, Moolenaar MJ, Speckamp WN, Hiemstra H. Oxazaborolidine catalysed enantioselective reduction of cyclic meso-imides Tetrahedron Asymmetry. 8: 1773-1789. DOI: 10.1016/S0957-4166(97)00154-7 |
0.525 |
|
| 1997 |
Teerhuis NM, Hiemstra H, Speckamp WN. Synthesis of enantiopure aza-analogues of cocaine Tetrahedron Letters. 38: 159-162. DOI: 10.1016/S0040-4039(96)02242-3 |
0.512 |
|
| 1997 |
Teerhuis NM, Hiemstra H, Speckamp WN. Synthesis of enantiopure (nor)-azatropanes via N-acylhydrazonium ion intermediates Tetrahedron Letters. 38: 155-158. DOI: 10.1016/S0040-4039(96)02241-1 |
0.604 |
|
| 1996 |
Luker T, Hiemstra H, Speckamp WN. Synthesis and reactivity of pyrrolidinone- and piperidinone-derived enol triflates Tetrahedron Letters. 37: 8257-8260. DOI: 10.1016/0040-4039(96)01883-7 |
0.538 |
|
| 1996 |
Bernabé P, Rutjes FPJT, Hiemstra H, Speckamp WN. Palladium(0)-catalyzed coupling reactions of an N-tosylpyrrolidinone-derived enamine triflate Tetrahedron Letters. 37: 3561-3564. DOI: 10.1016/0040-4039(96)00612-0 |
0.547 |
|
| 1996 |
Louwrier S, Ostendorf M, Boom A, Hiemstra H, Speckamp WN. Studies towards the synthesis of (+)-ptilomycalin A; stereoselective N-acyliminium ion coupling reactions to enantiopure C-2 substituted lactams Tetrahedron. 52: 2603-2628. DOI: 10.1016/0040-4020(95)01085-8 |
0.607 |
|
| 1995 |
Pirrung FOH, Hiemstra H, Speckamp WN, Kaptein B, Schoemaker HE. Synthesis of enantiomerically pure eight- and nine-membered lactones by copper(I) chloride/2,2'-bipyridine-catalyzed cyclization Synthesis. 458-472. DOI: 10.1055/S-1995-4429 |
0.699 |
|
| 1995 |
Hopman JCP, Hiemstra H, Speckamp WN. Electronic influence of iron tetracarbonyl complexation on unsaturated N,N-diacyliminium ion precursors Journal of the Chemical Society, Chemical Communications. 619-620. DOI: 10.1039/C39950000619 |
0.499 |
|
| 1995 |
Hopman JCP, Hiemstra H, Speckamp WN. Chirality preservation in pyrrolinone iron tetracarbonyl complexes - A route to enantiopure 5-substituted pyrrolinones Journal of the Chemical Society, Chemical Communications. 617-618. DOI: 10.1039/C39950000617 |
0.492 |
|
| 1995 |
Roos EC, Bernabé P, Hiemstra H, Speckamp WN, Kaptein B, Boesten WHJ. Palladium-catalyzed transprotection of allyloxycarbonyl-protected amines: Efficient one-pot formation of amides and dipeptides Journal of Organic Chemistry. 60: 1733-1740. DOI: 10.1021/Jo00111A035 |
0.538 |
|
| 1995 |
Moolenaar MJ, Speckamp WN, Hiemstra H, Poetsch E, Casutt M. Synthesis of D-( + )-biotin through selective ring closure of N-acyliminium silyl enol ethers Angewandte Chemie (International Edition in English). 34: 2391-2393. DOI: 10.1002/Anie.199523911 |
0.547 |
|
| 1995 |
Van Benthem RATM, Hiemstra H, Van Leeuwen PWNM, Geus JW, Speckamp WN. Sulfoxide-stabilized giant palladium clusters in catalyzed oxidations Angewandte Chemie (International Edition in English). 34: 457-460. DOI: 10.1002/Anie.199504571 |
0.404 |
|
| 1994 |
Speckamp WN, Newcombe NJ, Hiemstra H, Ya F, Vijn RJ, Koot WJ. N-acyliminium ion cyclisations in natural product chemistry: Synthesis of gelsemine Pure and Applied Chemistry. 66: 2163-2166. DOI: 10.1351/Pac199466102163 |
0.538 |
|
| 1994 |
Newcombe NJ, Ya F, Vijn RJ, Hiemstra H, Speckamp WN. The total synthesis of (±)-gelsemine Journal of the Chemical Society - Series Chemical Communications. 767-768. DOI: 10.1039/C39940000767 |
0.478 |
|
| 1994 |
Van Benthem RATM, Hiemstra H, Michels JJ, Speckamp WN. Palladium(II)-catalysed oxidation of allylic amines with molecular oxygen Journal of the Chemical Society, Chemical Communications. 357-359. DOI: 10.1039/C39940000357 |
0.461 |
|
| 1994 |
Udding JH, Giesselink JPM, Hiemstra H, Speckamp WN. Xanthate transfer cyclization of glycolic acid-derived radicals. Synthesis of five- to eight-membered ring ethers Journal of Organic Chemistry. 59: 6671-6682. DOI: 10.1021/Jo00101A027 |
0.561 |
|
| 1994 |
Udding JH, Tuijp KCJM, Van Zanden MNA, Hiemstra H, Speckamp WN. Transition metal-catalyzed, chlorine-transfer radical cyclizations of 2-(3-alken-1-oxy)-2-chloroacetates. Formal total synthesis of avenaciolide and isoavenaciolide Journal of Organic Chemistry. 59: 1993-2003. DOI: 10.1021/Jo00087A011 |
0.571 |
|
| 1994 |
Udding JH, Papin N, Hiemstra H, Speckamp WN. Copper-catalysed N-acyliminium ion cyclisation to 3-azabicyclo[3.3.1]nonanes; synthesis of 2,4-disubstituted 1-aza-adamantanes Tetrahedron. 50: 8853-8862. DOI: 10.1016/S0040-4020(01)85358-8 |
0.597 |
|
| 1994 |
Lolkema LDM, Semeyn C, Ashek L, Hiemstra H, Speckamp WN. Studies on the role of the 2-oxonia Cope rearrangement in π-cyclizations of α-methoxycarbonyl oxycarbenium ions Tetrahedron. 50: 7129-7140. DOI: 10.1016/S0040-4020(01)85239-X |
0.579 |
|
| 1994 |
Lolkema LDM, Hiemstra H, Semeyn C, Speckamp WN. π-Cyclizations of α-methoxycarbonyl oxycarbenium ions; synthesis of oxacyclic carboxylic esters Tetrahedron. 50: 7115-7128. DOI: 10.1016/S0040-4020(01)85238-8 |
0.581 |
|
| 1994 |
van Benthem RATM, Hiemstra H, Longarela GR, Speckamp WN. Formamide as a superior nitrogen nucleophile in palladium(II) mediated synthesis of imidazolidines Tetrahedron Letters. 35: 9281-9284. DOI: 10.1016/0040-4039(94)88488-9 |
0.556 |
|
| 1993 |
Koot WJ, Hiemstra H, Speckamp WN. Stereochemistry of allylic alkylation of the tetracarbonyliron complexes of (R)-1-acetyl-5-isopropoxy-3-pyrrolin-2-one Journal of the Chemical Society, Chemical Communications. 156-158. DOI: 10.1039/C39930000156 |
0.49 |
|
| 1993 |
Udding JH, Fraanje J, Goubitz K, Hiemstra H, Speckamp WN, Kaptein B, Schoemaker HE, Kamphuis J. Resolution of methyl cis-3-chloromethyl-2-tetrahydrofurancarboxylate via enzymatic hydrolysis Tetrahedron: Asymmetry. 4: 425-432. DOI: 10.1016/S0957-4166(00)86087-5 |
0.656 |
|
| 1993 |
Koot WJ, Hiemstra H, Speckamp WN. Conjugate addition of amines and thiols to (R)-1-acetyl-5-isopropoxy-3-pyrrolin-2-one; Preparation of enantiopure N-acyliminium ion precursors Tetrahedron: Asymmetry. 4: 1941-1948. DOI: 10.1016/S0957-4166(00)80435-8 |
0.584 |
|
| 1993 |
Rutjes FPJT, Hiemstra H, Pirrung FOH, Speckamp WN. Synthesis of bridged bicyclic hydrazines via endocyclic N-acylhydrazonium intermediates: A novel route to the 1-Azatropane skeleton Tetrahedron. 49: 10027-10048. DOI: 10.1016/S0040-4020(01)80199-X |
0.603 |
|
| 1992 |
Udding JH, Hiemstra H, Speckamp WN. Radical transfer catalysis versus Lewis acid catalysis by the copper(I) chloride-2,2′-bipyridine complex: The effect of the structure of the ligand Journal of the Chemical Society, Perkin Transactions 2. 1529-1530. DOI: 10.1039/P29920001529 |
0.52 |
|
| 1992 |
Udding JH, Tuijp CJM, Hiemstra H, Speckamp WN. Radical-transfer catalysis versus lewis acid catalysis by the copper(I) chloride/2,2′-bipyridine complex: An illustration of the synthetic significance of captodative radical stabilization Journal of the Chemical Society, Perkin Transactions 2. 857-858. DOI: 10.1039/P29920000857 |
0.507 |
|
| 1992 |
Koot WJ, Hiemstra H, Speckamp WN. (R)-1-acetyl-5-isopropoxy-3-pyrrolin-2-one: A versatile chiral dienophile from (S)-malic acid Journal of Organic Chemistry. 57: 1059-1061. DOI: 10.1021/Jo00030A002 |
0.541 |
|
| 1992 |
Koot WJ, Hiemstra H, Speckamp WN. Stereoselective synthesis of enantiopure 4,5-disubstituted pyrrolidin-2-ones by consecutive cuprate addition and N-acyliminium coupling Tetrahedron Letters. 33: 7969-7972. DOI: 10.1016/S0040-4039(00)74791-5 |
0.576 |
|
| 1992 |
Pirrung FOH, Steeman WJM, Hiemstra H, Speckamp WN, Kaptein B, Boesten WHJ, Schoemaker HE, Kamphuis J. Synthesis of medium-sized lactones by copper(I) catalyzed atom transfer cyclization Tetrahedron Letters. 33: 5141-5144. DOI: 10.1016/S0040-4039(00)61212-1 |
0.687 |
|
| 1992 |
Esch PM, Hiemstra H, de Boer RF, Speckamp WN. Reductive cyclization of carbon-centered glycine radicals; a novel synthetic route to cyclic α-amino acids Tetrahedron. 48: 4659-4676. DOI: 10.1016/S0040-4020(01)81240-0 |
0.56 |
|
| 1992 |
Roos EC, Mooiweer HH, Hiemstra H, Speckamp WN, Kaptein B, Boesten WHJ, Kamphuis J. Synthesis of racemic α-amino carboxamides via Lewis acid-mediated reactions of α-methoxyglycinamide derivatives with allylsilanes: Enzymatic resolution to optically active α-amino acids Journal of Organic Chemistry. 57: 6769-6778. |
0.502 |
|
| 1992 |
Van Benthem RATM, Hiemstra H, Speckamp WN. Synthesis of N-Boc-protected 1-amino-3-alken-2-ols from allylic carbamates via palladium(II)-catalyzed oxidative cyclization Journal of Organic Chemistry. 57: 6083-6085. |
0.323 |
|
| 1991 |
Koot WJ, van Ginkel R, Kranenburg M, Hiemstra H, Louwrier S, Moolenaar MJ, Speckamp WN. Synthesis of statine from (S)-malic acid; stereocontrol via radical cyclization Tetrahedron Letters. 32: 401-404. DOI: 10.1016/S0040-4039(00)92639-X |
0.568 |
|
| 1991 |
Esch PM, Boska IM, Hiemstra H, de Boer RF, Speckamp WN. Tin tetrachloride-induced π-cyclizations of glycine cation equivalents to substituted pipecolic acid derivatives Tetrahedron. 47: 4039-4062. DOI: 10.1016/S0040-4020(01)86443-7 |
0.589 |
|
| 1991 |
Mooiweer HH, Hiemstra H, Speckamp WN. Total synthesis of (±)-α-allokainic acid via two allylsilane N-acyliminium ion reactions Tetrahedron. 47: 3451-3462. DOI: 10.1016/S0040-4020(01)86407-3 |
0.612 |
|
| 1991 |
Udding JH, Hiemstra H, van Zanden MNA, Speckamp WN. Copper catalyzed chlorine transfer cyclizations of glycine and glycolic acid derivatives Tetrahedron Letters. 32: 3123-3126. DOI: 10.1016/0040-4039(91)80706-C |
0.531 |
|
| 1991 |
Roos EC, Bernabé P, Hiemstra H, Speckamp WN, Kaptein B, Boesten WHJ. Palladium-catalyzed synthesis of amides and peptides Tetrahedron Letters. 32: 6633-6636. DOI: 10.1016/0040-4039(91)80241-W |
0.519 |
|
| 1991 |
Rutjes FPJT, Paz MM, Hiemstra H, Speckamp WN. Palladium-catalyzed reactions with N,N′-diallyloxycarbonylhydrazines Tetrahedron Letters. 32: 6629-6632. DOI: 10.1016/0040-4039(91)80240-7 |
0.532 |
|
| 1990 |
Pirrung FOH, Rutjes FPJT, Hiemstra H, Speckamp WN. Synthesis of bridged bicyclic hydrazines via cyclic N-acylhydrazonium intermediates Tetrahedron Letters. 31: 5365-5368. DOI: 10.1016/S0040-4039(00)98073-0 |
0.608 |
|
| 1989 |
Zonjee JN, Koning Hd, Speckamp WN. Diastereoselectivity in the cyclization of 1-[2-(benzyloxymethyl)-3-butenyl]-5-ethoxy-2-pyrrolidinones Tetrahedron. 45: 7553-7564. DOI: 10.1016/S0040-4020(01)89217-6 |
0.383 |
|
| 1989 |
Mooiweer HH, Hiemstra H, Speckamp WN. Synthesis of γ,δ,-unsaturated α-amino acids from allylsilanes and glycidyl cation equivalents Tetrahedron. 45: 4627-4636. DOI: 10.1016/S0040-4020(01)89098-0 |
0.571 |
|
| 1989 |
Klaver WJ, Hiemstra H, Speckamp WN. Synthesis and absolute configuration of the Aristotelia alkaloid peduncularine Journal of the American Chemical Society. 111: 2588-2595. |
0.312 |
|
| 1988 |
Hiemstra H, Speckamp WN. Chapter 4 N-Acyliminium Ions as Intermediates in Alkaloid Synthesis Alkaloids: Chemistry and Pharmacology. 32: 271-339. DOI: 10.1016/S0099-9598(08)60218-7 |
0.545 |
|
| 1988 |
Rutjes FPJT, Hiemstra H, Mooiweer HH, Speckamp WN. Cyclic 1,2-dinitrogen compounds through N,N′-di(methoxycarbonyl)hydrazinium intermediates Tetrahedron Letters. 29: 6975-6978. DOI: 10.1016/S0040-4039(00)88492-0 |
0.583 |
|
| 1988 |
Lolkema LDM, Hiemstra H, Mooiweer HH, Speckamp WN. Synthesis of oxacyclic carboxylic esters by way of methoxycarbonyloxonium ions; Evidence for a cationic oxa-cope rearrangement Tetrahedron Letters. 29: 6365-6368. DOI: 10.1016/S0040-4039(00)82348-5 |
0.567 |
|
| 1988 |
M. Esch P, Hiemstra H, Speckamp WN. Oxazinone versus allene formation in the reaction of N-alkoxycarbonyliminium ions with propargyltrimethylsilane Tetrahedron Letters. 29: 367-370. DOI: 10.1016/S0040-4039(00)80098-2 |
0.53 |
|
| 1988 |
Klaver WJ, Hiemstra H, Speckamp WN. Silicon-assisted synthesis of bridged azabicyclic systems via N-acyliminium intermediates Tetrahedron. 44: 6729-6738. DOI: 10.1016/S0040-4020(01)90113-9 |
0.589 |
|
| 1988 |
Klaver WJ, Moolenaar MJ, Hiemstra H, Speckamp WN. Intramolecular reactions of 2-propynylsilanes with n-acyliminium ions. Cuprate Sn2' reactions of the allenic products as a route to trans-fused carbobicycles Tetrahedron. 44: 3805-3818. DOI: 10.1016/S0040-4020(01)86638-2 |
0.58 |
|
| 1988 |
Hiemstra H, Vijn RJ, Speckamp WN. Synthetic studies toward gelsemine. 2. Preparation of the tetracyclic skeletal part by way of a highly stereospecific intramolecular reaction of a silyl enol ether with an N-acyliminium ion Journal of Organic Chemistry. 53: 3882-3884. |
0.326 |
|
| 1987 |
Klaver WJ, Hiemstra H, Speckamp WN. Diastereoselective alkylation of the dianion of 5-ethoxy-4(S)-hydroxy-1-isopropyl-2-pyrrolidinone; Synthesis of enantiomerically pure azabicycles Tetrahedron Letters. 28: 1581-1584. DOI: 10.1016/S0040-4039(01)81047-9 |
0.502 |
|
| 1987 |
Mooiweer HH, Hiemstra H, Fortgens HP, Speckamp WN. Intramolecular reactions of acyclic n-acyliminium ions III silicon assisted cyclocondensation of glyoxylic esters to proline and pipecolic acid derivatives Tetrahedron Letters. 28: 3285-3288. DOI: 10.1016/S0040-4039(00)95494-7 |
0.582 |
|
| 1987 |
Vijn RJ, Hiemstra H, Kok JJ, Knotter M, Speckamp WN. Synthetic studies towards gelsemine, I The importance of the antiperiplanar effect in the highly regioselective reduction of non-symmetrical cis-hexahydrophthalimides Tetrahedron. 43: 5019-5030. DOI: 10.1016/S0040-4020(01)87680-8 |
0.502 |
|
| 1986 |
Melching KH, Hiemstra H, Klaver WJ, Speckamp WN. Total synthesis of (±)-anatoxin-a via N-acyliminium intermediates Tetrahedron Letters. 27: 4799-4802. DOI: 10.1016/S0040-4039(00)85068-6 |
0.565 |
|
| 1986 |
Hiemstra H, Klaver WJ, Speckamp WN. Regioselective synthesis of (±)-gabaculine Tetrahedron Letters. 27: 1411-1414. DOI: 10.1016/S0040-4039(00)84272-0 |
0.522 |
|
| 1985 |
Hiemstra H, Fortgens HP, Stegenga S, Speckamp WN. Intramolecular reactions of acyclic N-acyliminium ions I propargyl silanes as nucleophiles Tetrahedron Letters. 26: 3151-3154. DOI: 10.1016/S0040-4039(00)98643-X |
0.574 |
|
| 1985 |
Hamersma JAM, Speckamp WN. Stereoselective synthesis of heterocycles by desulfurisation of condensed thiazolidin-2-ones Tetrahedron. 41: 2861-2866. DOI: 10.1016/S0040-4020(01)96605-0 |
0.364 |
|
| 1985 |
Speckamp WN, Hiemstra H. Intramolecular reactions of N-acyliminium intermediates Tetrahedron. 41: 4367-4416. DOI: 10.1016/S0040-4020(01)82334-6 |
0.534 |
|
| 1984 |
Hiemstra H, Klaver WJ, Moolenaar MJ, Speckamp WN. Novel approach to trans-fused carbobicycles Tetrahedron Letters. 25: 5453-5456. DOI: 10.1016/S0040-4039(01)91310-3 |
0.561 |
|
| 1983 |
Hiemstra H, Speckamp WN. Completely regioselective α-acyliminium ion cyclizations with allyl and propargyl silanes Tetrahedron Letters. 24: 1407-1410. DOI: 10.1016/S0040-4039(00)81668-8 |
0.572 |
|
| 1982 |
Hamersma JAM, Speckamp WN. Novel synthesis of aza-heterocycles Tetrahedron Letters. 23: 3811-3814. DOI: 10.1016/S0040-4039(00)87714-X |
0.345 |
|
| 1982 |
Hamersma JAM, Speckamp WN. Thia-acyliminium - olefin cyclizations Tetrahedron. 38: 3255-3266. DOI: 10.1016/0040-4020(82)80103-8 |
0.364 |
|
| 1981 |
Veenstra SJ, Speckamp WN. A stereoselective synthesis of indole alkaloid intermediates via N-acyliminium cyclizations Journal of the American Chemical Society. 103: 4645-4646. |
0.395 |
|
| 1980 |
Schoemaker HE, Speckamp WN. Stereocontrolled synthesis of functionalized 1-azaspirans. Efficient synthesis of perhydrohistrionicotoxin Tetrahedron. 36: 951-958. DOI: 10.1016/0040-4020(80)80047-0 |
0.569 |
|
| 1979 |
Schoemaker HE, Kruk C, Speckamp WN. 5-Exo-Trig vs 6-Endo-Trig α-acyliminium ion-olefin cyclisations stereoselective synthesis of 7-(1-formyloxy-pent-1-yl)-1-aza-4-oxa-spiro[4.5]decane-2-ones Tetrahedron Letters. 20: 2437-2440. DOI: 10.1016/S0040-4039(01)86313-9 |
0.592 |
|
| 1979 |
Hamersma JAM, Schoemaker HE, Speckamp WN. The 2-oxo-thiazolidinium moiety as a novel initiating center for stereoselective olefin cyclisations Tetrahedron Letters. 20: 1347-1350. DOI: 10.1016/S0040-4039(01)86146-3 |
0.58 |
|
| 1979 |
Bok THR, Speckamp WN. Synthesis and conformational analysis of exo-and endo-7-substituted-3-azabicyclo[3.3.1]nonanes Tetrahedron. 35: 267-272. DOI: 10.1016/S0040-4020(01)99493-1 |
0.306 |
|
| 1978 |
Schoemaker HE, Speckamp WN. A novel synthetic approach to perhydrohistrionicotoxin stereoselective synthesis of 1-aza-spiranes Tetrahedron Letters. 19: 1515-1518. DOI: 10.1016/S0040-4039(01)94590-3 |
0.561 |
|
| 1978 |
Schoemaker HE, Speckamp WN. A short and stereoselective synthesis of perhydrohistrionicotoxin Tetrahedron Letters. 19: 4841-4844. DOI: 10.1016/S0040-4039(01)85748-8 |
0.585 |
|
| 1978 |
Wijnberg JBPA, Schoemaker HE, Speckamp WN. A regioselective reduction of gem-disubstituted succinimides Tetrahedron. 34: 179-187. DOI: 10.1016/S0040-4020(01)93601-4 |
0.568 |
|
| 1978 |
Schoemaker HE, Dijkink J, Speckamp WN. Biomimetic α-acylimmonium cyclisations of unactivated olefin Tetrahedron. 34: 163-172. DOI: 10.1016/S0040-4020(01)93599-9 |
0.498 |
|
| 1977 |
Boer-Terpstra T, Dijkink J, Schoemaker HE, Speckamp WN. Acetylene cyclisations of α-acylimmonium ions efficient synthesis of bridgehead nitrogen bicyclic ketones Tetrahedron Letters. 18: 939-942. DOI: 10.1016/S0040-4039(01)92797-2 |
0.582 |
|
| 1975 |
Dijkink J, Speckamp WN. Biomimetic heterocyclization Tetrahedron Letters. 16: 4047-4050. DOI: 10.1016/S0040-4039(00)91232-2 |
0.321 |
|
| 1975 |
Dijkink J, Schoemaker HE, Speckamp WN. Biomimetic heterocyclisations reactivity of rigid unsaturated systems Tetrahedron Letters. 16: 4043-4046. DOI: 10.1016/S0040-4039(00)91231-0 |
0.45 |
|
| 1974 |
Wijnberg JBPA, Speckamp WN, de Boer JJJ. Cationic heterocyclization One step synthesis of condensed heterocyclics Tetrahedron Letters. 15: 4077-4080. DOI: 10.1016/S0040-4039(01)92088-X |
0.363 |
|
| 1974 |
Wijnberg JBPA, Speckamp WN, Schoemaker HE. A remarkably regioselective reduction of gem-disubstituted succinimides Tetrahedron Letters. 15: 4073-4076. DOI: 10.1016/S0040-4039(01)92087-8 |
0.571 |
|
| 1973 |
HUBERT JC, SPECKAMP WN, HUISMAN HO. ChemInform Abstract: BRUECKENSTICKSTOFF-HETEROCYCLEN UEBER IMIDRED. Chemischer Informationsdienst. 4: no-no. DOI: 10.1002/CHIN.197308247 |
0.605 |
|
| 1972 |
De Nijs H, Speckamp WN, Huisman HO. Photo-bromination of 4,4-dimethyl-Δ5-steroids Journal of the Chemical Society, Chemical Communications. 350-351. DOI: 10.1039/C39720000350 |
0.577 |
|
| 1972 |
Hubert JC, Speckamp WN, Huisman HO. Bridgehead nitrogen heterocyclics via imide reduction. Tetrahedron Letters. 13: 4493-4496. DOI: 10.1016/S0040-4039(01)94349-7 |
0.608 |
|
| 1972 |
Rijsenbrij PPM, Loven R, Wijnberg JBPA, Speckamp WN, Huisman HO. Functionally substituted piperidines via heterocycloaddition. Tetrahedron Letters. 13: 1425-1428. DOI: 10.1016/S0040-4039(01)84645-1 |
0.565 |
|
| 1972 |
KOENST WMB, VAN BRUYNSVOORT J, SPECKAMP WN, HUISMAN HO. ChemInform Abstract: HETEROCYCLISCHE STEROIDE 25. MITT. TOTALSYNTH. VON MODIFIZIERTEN 6-THIA-OESTROGENEN Chemischer Informationsdienst. 3: no-no. DOI: 10.1002/CHIN.197240472 |
0.61 |
|
| 1972 |
KOENST WMB, SPECKAMP WN, HOUWEN HO, HUISMAN HO. ChemInform Abstract: HETEROCYCLISCHE STEROIDE 24. MITT. ASYMMETRISCHE SYNTH. VON OPTISCH AKTIVEN 6-THIA-OESTROGENEN Chemischer Informationsdienst. 3: no-no. DOI: 10.1002/CHIN.197240471 |
0.61 |
|
| 1972 |
RIJSENBRIJ PPM, LOVEN R, WIJNBERG JBPA, SPECKAMP WN, HUISMAN HO. ChemInform Abstract: FUNKTIONELL SUBSTITUIERTE PIPERIDINE UEBER EINE HETEROCYCLOADDITION Chemischer Informationsdienst. 3: no-no. DOI: 10.1002/CHIN.197230293 |
0.625 |
|
| 1972 |
DE NIJS H, SPECKAMP WN, HUISMAN HO. ChemInform Abstract: PHOTO-BROMIERUNG VON 4,4-DIMETHYL-DELTA(5)-STEROIDEN Chemischer Informationsdienst. 3: no-no. DOI: 10.1002/CHIN.197226449 |
0.606 |
|
| 1972 |
DUBAS-SLUYTER MAT, SPECKAMP WN, HUISMAN HO. ChemInform Abstract: HETEROCYCLISCHE STEROIDE 23. MITT. SYNTH. VON HETEROCYCLEN UEBER 1-AMINO-3-OXO-CYCLOHEXEN-(1) Chemischer Informationsdienst. 3: no-no. DOI: 10.1002/CHIN.197217187 |
0.606 |
|
| 1971 |
Hubert JCH, Steege W, Speckamp WN, Huisman HO. A novel reductive cyclization of imides Synthetic Communications. 1: 103-109. DOI: 10.1080/00397917108081624 |
0.619 |
|
| 1971 |
Dekkers AWJD, Speckamp WN, Huisman HO. Addition of diethyl 2-bromomesaconate to N-tosylpiperidone enamine Tetrahedron Letters. 12: 489-492. DOI: 10.1016/S0040-4039(01)96476-7 |
0.577 |
|
| 1971 |
Speckamp WN, Dijkink J, Dekkers(in part) AWJD, Huisman HO. Synthesis of substituted 3-aza-bicyclo[3.3.1]Nonanes Tetrahedron. 27: 3143-3156. DOI: 10.1016/S0040-4020(01)98107-4 |
0.667 |
|
| 1971 |
HUBERT JC, STEEGE W, SPECKAMP WN, HUISMAN HO. ChemInform Abstract: EINE NEUARTIGE REDUKTIVE CYCLISIERUNG VON IMIDEN Chemischer Informationsdienst. Organische Chemie. 2: no-no. DOI: 10.1002/CHIN.197152387 |
0.604 |
|
| 1971 |
SPECKAMP WN, DIJKINK J, DEKKERS AWJD, HUISMAN HO. ChemInform Abstract: SYNTH. VON SUBSTITUIERTEN 3-AZA-BICYCLO(3,3,1)NONANEN Chemischer Informationsdienst. Organische Chemie. 2: no-no. DOI: 10.1002/CHIN.197142342 |
0.638 |
|
| 1971 |
DEKKERS AWJD, SPECKAMP WN, HUISMAN HO. ChemInform Abstract: ADDITION VON DIAETHYL-2-BROM-MESACONAT AN N-TOSYL-PIPERIDON-ENAMIN Chemischer Informationsdienst. Organische Chemie. 2: no-no. DOI: 10.1002/CHIN.197124322 |
0.615 |
|
| 1971 |
BARENDS RJP, SPECKAMP WN, HUISMAN HO. ChemInform Abstract: 2+4-CYCLOADDITION VON N-CHLORSULFONYLISOCYANAT AN EIN VINYLDIHYDRONAPHTHALIN Chemischer Informationsdienst. Organische Chemie. 2: no-no. DOI: 10.1002/CHIN.197113335 |
0.617 |
|
| 1971 |
SCHENK H, KOENST WMB, SPECKAMP WN, HUISMAN HO. ChemInform Abstract: DIE MOLEKUELSTRUKTUR EINES 6-THIA-OESTROGENS Chemischer Informationsdienst. Organische Chemie. 2: no-no. DOI: 10.1002/Chin.197109395 |
0.676 |
|
| 1970 |
Schenk H, Könst WM, Speckamp WN, Huisman HO. The molecular strucure of a 6-thiaestrogen. Tetrahedron Letters. 4937-40. PMID 5500065 DOI: 10.1016/S0040-4039(00)99748-X |
0.574 |
|
| 1970 |
Könst WM, van Bruynsvoort JL, Speckamp WN, Huisman HO. Anomalous spiro- and aromatized 6-thiaestrogens. Tetrahedron Letters. 2527-30. PMID 5447992 DOI: 10.1016/S0040-4039(01)98272-3 |
0.589 |
|
| 1970 |
Speckamp WN, Westra JG, Huisman HO. Heterocyclic steroids. XVII. Total synthesis of 6-thia-estrogens. Tetrahedron. 26: 2353-63. PMID 5419196 DOI: 10.1016/S0040-4020(01)92814-5 |
0.617 |
|
| 1970 |
Speckamp WN, Barends RJ, de Gee AJ, Huisman HO. Heterocyclic steroids. XVI. A new synthesis of 13-aza-estrone. Tetrahedron Letters. 383-6. PMID 5418341 DOI: 10.1016/0040-4039(70)80091-0 |
0.628 |
|
| 1970 |
Deckers FHM, Speckamp WN, Huisman HO. Non-symmetrical isothianaphthenes Journal of the Chemical Society D: Chemical Communications. 1521-1522. DOI: 10.1039/C29700001521 |
0.496 |
|
| 1970 |
Speckamp WN, Dijkink J, Huisman HO. 1-Aza-adamantanes Journal of the Chemical Society D: Chemical Communications. 197-198. DOI: 10.1039/C29700000197 |
0.614 |
|
| 1970 |
Speckamp WN, Dijkink J, Huisman HO. Synthesis of 3-aza-bicyclo3,3,1nonanes Journal of the Chemical Society D: Chemical Communications. 196-197. DOI: 10.1039/C29700000196 |
0.649 |
|
| 1970 |
Speckamp WN, Dijkink J, Maassen JA, Huisman HO. Dual fragmentation of thiachromanones-4 upon sulfur-ylid treatment. Formation of thianaphthenes. Tetrahedron Letters. 11: 2743-2746. DOI: 10.1016/S0040-4039(01)98329-7 |
0.521 |
|
| 1970 |
Barends RJP, Speckamp WN, Huisman HO. 2+4 Cycloaddition of N-Chlorosulfonylisocyanate to a vinyldihydronaphthalene. Tetrahedron Letters. 11: 5301-5304. DOI: 10.1016/S0040-4039(00)99999-4 |
0.578 |
|
| 1970 |
SPECKAMP WN, DIJKINK J, MAASSEN JA, HUISMAN HO. ChemInform Abstract: ZWEIFACHE FRAGMENTIERUNG VON THIACHROMANONEN-(4) BEI DER BEHANDLUNG MIT SCHWEFEL-YLIDEN, BLDG. VON THIANAPHTHENEN Chemischer Informationsdienst. Organische Chemie. 1: no-no. DOI: 10.1002/CHIN.197040286 |
0.584 |
|
| 1970 |
KOENST WMB, VAN BRUYNSVOORT JL, SPECKAMP WN, HUISMAN HO. ChemInform Abstract: ANOMALE SPIRO- UND AROMATISIERTE 6-THIAOESTROGENE Chemischer Informationsdienst. Organische Chemie. 1: no-no. DOI: 10.1002/CHIN.197039334 |
0.615 |
|
| 1970 |
SPECKAMP WN, WESTRA JG, HUISMAN HO. ChemInform Abstract: HETEROCYCLISCHE STEROIDE 17. MITT. TOTALSYNTH. VON 6-THIA-OESTROGENEN Chemischer Informationsdienst. Organische Chemie. 1: no-no. DOI: 10.1002/CHIN.197037408 |
0.61 |
|
| 1970 |
SPECKAMP WN, DIJKINK J, HUISMAN HO. ChemInform Abstract: DARST. VON 3-AZA-BICYCLO(3,3,1)NONANEN Chemischer Informationsdienst. Organische Chemie. 1: no-no. DOI: 10.1002/CHIN.197021257 |
0.638 |
|
| 1970 |
SPECKAMP WN, BARENDS RJP, DE GEE AJ, HUISMAN HO. ChemInform Abstract: HETEROCYCLISCHE STEROIDE 16. MITT. SYNTH. FUER 13-AZA-OESTRON Chemischer Informationsdienst. Organische Chemie. 1: no-no. DOI: 10.1002/CHIN.197018421 |
0.626 |
|
| 1969 |
Hubert JC, Speckamp WN, Huisman HO. Heterocyclic steroids XIV. Total synthesis of d,1-8,9-dehydro-13-azaestrone methyl ether. Tetrahedron Letters. 1553-6. PMID 5790707 |
0.601 |
|
| 1968 |
Speckamp WN, van Velthuysen JA, Douw MA, Pandit UK, Huisman HO. Heterocyclic steroids. 13. The synthesis of N-methyl-6-aza-8(14)-dehydro-19-nor-testosterone. Tetrahedron. 24: 5893-8. PMID 5713422 |
0.647 |
|
| 1968 |
Speckamp WN, van Velthuysen JA, Pandit UK, Huisman HO. Heterocyclic steroids. XII. N-ethyl-6-aza-8(14)-dehydroestrone methyl ether. Tetrahedron. 24: 5881-91. PMID 5713421 DOI: 10.1016/S0040-4020(01)96318-5 |
0.646 |
|
| 1968 |
Lakeman J, Speckamp WN, Huisman HO. Addition to steroid polyenes--V. Reaction of 7-dehydroprogesterone-diketal with dimethyl diazodicarboxylate. Tetrahedron. 24: 5151-3. PMID 5665124 |
0.549 |
|
| 1968 |
Speckamp WN, Neeter R, Rademaker PD, Huisman HO. Dihydroquinolones VI. Unusual fragmentation of a heterocyclic ring upon sulfur-ylide treatment Tetrahedron Letters. 9: 3795-3796. |
0.57 |
|
| 1967 |
Lakeman J, Speckamp WN, Huisman HO. Addition to steroid polyenes IV. Ring D-fission and ring C-aromatization in 4,4-dimethyl-Δ5,7-steroidal systems Tetrahedron Letters. 8: 3699-3703. |
0.564 |
|
| 1966 |
van Velthuysen JA, Douw MA, Speckamp WN, Pandit UK, Huisman HO. Heterocyclic steroids 8. Synthesis of (+ -)-N-methyl-6-aza-8(14)-dehydro-19-nor-testosterone. Tetrahedron Letters. 27: 3081-6. PMID 5955874 DOI: 10.1016/S0040-4039(01)99919-8 |
0.68 |
|
| 1966 |
Sluyter MA, Pandit UK, Speckamp WN, Huisman HO. Heterocyclic steroids. VI. Total synthesis of 4-aza-19-norsteroids. Tetrahedron Letters. 87-90. PMID 5904861 DOI: 10.1016/S0040-4039(01)99635-2 |
0.645 |
|
| 1966 |
Westra JG, Speckamp WN, Pandit UK, Huisman HO. Heterocyclic steroids VII. Total synthesis of 6-thiasteroids Tetrahedron Letters. 7: 2781-2784. DOI: 10.1016/S0040-4039(00)62024-5 |
0.642 |
|
| 1966 |
Speckamp WN, Pandit UK, Korver PK, van der Haak PJ, Huisman HO. Dihydroquinolones-V. Hindered inversion in dihydroquinolones and related systems Tetrahedron. 22: 2413-2427. |
0.477 |
|
| 1965 |
Speckamp WN, de Koning H, Pandit UK, Huisman HO. Heterocyclic steroids. IV. Total synthesis of some 6-aza-estrogens. Tetrahedron. 21: 2517-27. PMID 5879296 DOI: 10.1016/S0040-4020(01)93907-9 |
0.634 |
|
| 1965 |
Pandit UK, Speckamp WN, Huisman HO. Heterocyclic steroids-III. Mass spectra of 6-azasteroids with two aromatic rings Tetrahedron. 21: 1767-1775. DOI: 10.1016/S0040-4020(01)98648-X |
0.578 |
|
| 1964 |
Speckamp WN, Pandit UK, Huisman HO. A case of hindered inversion of trigonal nitrogen Tetrahedron Letters. 5: 3279-3284. DOI: 10.1016/S0040-4039(01)89423-5 |
0.512 |
|
| 1964 |
Huisman HO, Speckamp WN, de Koning H, Pandit UK. Total synthesis of aza-steroids II. Methyl ethers of 6-azaequilenin and 8ε{lunate},9ε{lunate}-6-azaestrone Tetrahedron Letters. 5: 1275-1278. |
0.604 |
|
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