Speckamp, W. N.: search on Z-Library

The world's largest scientific articles store. 70,000,000+ articles for free.

Don't use scam websites

1

2+4 Cycloaddition of N-Chlorosulfonylisocyanate to a vinyldihydronaphthalene.

R.J.P. Barends, W.N. Speckamp, H.O. Huisman

Journal:

Tetrahedron Letters

Year:

1970

Language:

english

File:

PDF, 214 KB

english, 1970

2

Synthesis of enantiopure aza-analogues of cocaine

N.Miranda Teerhuis, Henk Hiemstra, W.Nico Speckamp

Journal:

Tetrahedron Letters

Year:

1997

Language:

english

File:

PDF, 241 KB

english, 1997

3

Stereoselective Synthesis of Dihydropyrans via Vinylsilane-Terminated Cyclizations of Ester-Substituted Oxycarbenium Ion Intermediates

Semeyn, Cindy, Blaauw, Richard H., Hiemstra, Henk, Speckamp, W. Nico

Journal:

Journal of Organic Chemistry

Year:

1997

Language:

english

File:

PDF, 201 KB

english, 1997

4

New Applications of N-Acyliminium Precursors: Tetracarbonyliron-Mediated Stereoselective Alkylations of 5-(R)-Isopropoxy-3-pyrrolin-2-ones

Henk de Koning, Henk Hiemstra, Marinus J. Moolenaar, W. Nico Speckamp

Journal:

European Journal of Organic Chemistry

Year:

1998

Language:

english

File:

PDF, 606 KB

english, 1998

5

Sulfoxidstabilisierte Palladium-Riesencluster bei katalysierten Oxidation

Rolf A. T. M. van Benthem, Dr. Henk Hiemstra, Prof. Dr. Piet W. N. M. van Leeuwen, Prof. John W. Geus, Prof. Dr. W. Nico Speckamp

Journal:

Angewandte Chemie

Year:

1995

Language:

german

File:

PDF, 534 KB

german, 1995

6

Synthese von D-(+)-Biotin durch selektiven Ringschluß von N-Acyliminium-Silylenolethern

Marinus J. Moolenaar, Prof. Dr. W. Nico Speckamp, Dr. Henk Hiemstra, Dr. Eike Poetsch, Dr. Michael Casutt

Journal:

Angewandte Chemie

Year:

1995

Language:

german

File:

PDF, 377 KB

german, 1995

7

Highly Enantioselective Synthesis of a 2,3-Dihydroindole Mediated by N-Methylephedrine

Robert Jan Vijn, Prof. Dr. W. Nico Speckamp, Bart S. de Jong, Dr. Henk Hiemstra

Journal:

Angewandte Chemie International Edition

Year:

1984

Language:

english

File:

PDF, 244 KB

english, 1984

8

Sulfoxide-Stabilized Giant Palladium Clusters in Catalyzed Oxidations

Rolf A. T. M. van Benthem, Dr. Henk Hiemstra, Prof. Dr. Piet W. N. M. van Leeuwen, Prof. John W. Geus, Prof. Dr. W. Nico Speckamp

Journal:

Angewandte Chemie International Edition

Year:

1995

File:

PDF, 1.08 MB

1995

9

Synthesis of D-(+)-Biotin through Selective Ring Closure of N-Acyliminium Silyl Enol Ethers

Marinus J. Moolenaar, Prof. Dr. W. Nico Speckamp, Dr. Henk Hiemstra, Dr. Eike Poetsch, Dr. Michael Casutt

Journal:

Angewandte Chemie International Edition

Year:

1995

Language:

english

File:

PDF, 378 KB

english, 1995

10

Xanthate Transfer Cyclisation of Glycine Radicals; Synthesis of 5- and 6-Membered Ring Nitrogen Heterocycles

Jan H. Udding, J. P. M. Giesselink, Henk Hiemstra, W. Nico Speckamp

Journal:

Bulletin des Sociétés Chimiques Belges

Year:

1994

Language:

english

File:

PDF, 1.18 MB

english, 1994

11

ChemInform Abstract: Synthesis and Reactivity of Pyrrolidinone- and Piperidinone-Derived Enol Triflates.

T. LUKER, H. HIEMSTRA, W. N. SPECKAMP

Journal:

Year:

1997

File:

PDF, 29 KB

1997

12

ChemInform Abstract: Synthesis of Enantiopure Aza-Analogues of Cocaine.

N. M. TEERHUIS, H. HIEMSTRA, W. N. SPECKAMP

Journal:

Year:

1997

File:

PDF, 33 KB

1997

13

ChemInform Abstract: Synthesis of Enantiopure (Nor-)Azatropanes via N-Acylhydrazonium Ion Intermediates.

N. M. TEERHUIS, H. HIEMSTRA, W. N. SPECKAMP

Journal:

Year:

1997

File:

PDF, 32 KB

1997

14

ChemInform Abstract: Stereoselective Synthesis of Dihydropyrans via Vinylsilane-Terminated Cyclizations of Ester-Substituted Oxycarbenium Ion Intermediates.

C. SEMEYN, R. H. BLAAUW, H. HIEMSTRA, W. N. SPECKAMP

Journal:

Year:

1997

File:

PDF, 31 KB

1997

15

ChemInform Abstract: Oxazaborolidine-Catalyzed Enantioselective Reduction of Cyclic meso- Imides.

M. OSTENDORF, R. ROMAGNOLI, I. CABEZA PEREIRO, E. C. ROOS, M. J. MOOLENAAR, W. N. SPECKAMP, H. HIEMSTRA

Journal:

Year:

1997

File:

PDF, 32 KB

1997

16

ChemInform Abstract: Total Synthesis of Desoxoprosophylline: Application of a Lactam- Derived Enol Triflate to Natural Product Synthesis.

T. LUKER, H. HIEMSTRA, W. N. SPECKAMP

Journal:

Year:

1997

File:

PDF, 30 KB

1997

17

ChemInform Abstract: Synthesis and Further Reactivity of Functionalized Lactam-Derived Enol Triflates.

T. LUKER, H. HIEMSTRA, W. N. SPECKAMP

Journal:

Year:

1998

File:

PDF, 42 KB

1998

18

ChemInform Abstract: 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.

T. LUKER, W.-J. KOOT, H. HIEMSTRA, W. N. SPECKAMP

Journal:

Year:

1998

Language:

english

File:

PDF, 42 KB

english, 1998

19

ChemInform Abstract: New Applications of N-Acyliminium Precursors: Tetracarbonyliron-Mediated Stereoselective Alkylations of 5-(R)-Isopropoxy-3-pyrrolin-2-ones

H. DE KONING, H. HIEMSTRA, M. J. MOOLENAAR, W. N. SPECKAMP

Journal:

Year:

1998

File:

PDF, 27 KB

1998

20

ChemInform Abstract: Enantioselective Synthesis of a Key Tricyclic Intermediate en Route to (+)-Gelsemine.

Jan Dijkink, Jean-Christophe Cintrat, W. Nico Speckamp, Henk Hiemstra

Journal:

Year:

1999

File:

PDF, 30 KB

1999

21

ChemInform Abstract: A Kulinkovich Entry into Tertiary N-Acyliminium Ion Chemistry.

Lourdes Ollero, Gertjan Mentink, Floris P. J. T. Rutjes, W. Nico Speckamp, Henk Hiemstra

Journal:

Year:

2000

File:

PDF, 36 KB

2000

22

ChemInform Abstract: Application of an Organozinc Reagent Derived from (S)-Pyroglutamic Acid: A Formal Synthesis of Epibatidine.

Willem F. J. Karstens, Marinus J. Moolenaar, Floris P. J. T. Rutjes, Urszula Grabowska, W. Nico Speckamp, Henk Hiemstra

Journal:

Year:

2000

File:

PDF, 30 KB

2000

23

ChemInform Abstract: Enantioselective Formal Total Synthesis of Roseophilin.

Samantha J. Bamford, Tim Luker, W. Nico Speckamp, Henk Hiemstra

Journal:

Year:

2000

File:

PDF, 27 KB

2000

24

ChemInform Abstract: New Developments in the Chemistry of N-Acyliminium Ions and Related Intermediates

W. Nico Speckamp, Marinus J. Moolenaar

Journal:

Year:

2000

File:

PDF, 24 KB

2000

25

Stereochemical aspects in the mass spectra of N-Ts-3-aza-7-carbethoxybicyclo[3.3.1]Nonanes: Evidence for anchimeric assistance in the expulsion of a tosyl radical

A.W.J.D. Dekkers, N.M.M. Nibbering, W.N. Speckamp

Journal:

Year:

1972

Language:

english

File:

PDF, 515 KB

english, 1972

26

On the nature of sigma-coupled transitions : Through-bond interactions in 1-aza-adamantane derivatives

A.W.J.D. Dekkers, J.W. Verhoeven, W.N. Speckamp

Journal:

Year:

1973

Language:

english

File:

PDF, 368 KB

english, 1973

27

Total synthesis of 13- and 14-azaequilenines via heterocycloaddition

W.A. Zunnebeld, W.N. Speckamp

Journal:

Year:

1975

Language:

english

File:

PDF, 609 KB

english, 1975

28

Base induced 1,3 N → C tosyl migration

R.P. Loven, W.N. Speckamp

Journal:

Year:

1975

Language:

english

File:

PDF, 233 KB

english, 1975

29

Regio- and stereoselective addition of N-p-tosyl-trichloromethylimine to vinyl dihydronaphthalenes

R.P. Loven, W.A. Zunnebeld, W.N. Speckamp

Journal:

Year:

1975

Language:

english

File:

PDF, 518 KB

english, 1975

30

NaBH4 reduction of cyclic imides

J.C. Hubert, J.B.P.A. Wijnberg, W.Nico Speckamp

Journal:

Year:

1975

Language:

english

File:

PDF, 615 KB

english, 1975

31

Synthesis and conformational analysis of 6-substituted-3-azabicyclo[3,3,1]nonanes

Th. Reints Bok, W.N. Speckamp

Journal:

Year:

1977

Language:

english

File:

PDF, 615 KB

english, 1977

32

Selective reduction of the α-trichloromethyl function in piperidine sulfonamides

R.P. Lonen, W.N. Speckamp

Journal:

Year:

1978

Language:

english

File:

PDF, 496 KB

english, 1978

33

14-azasteroids via heterocycloaddition

R.P. Loven, W.N. Speckamp

Journal:

Year:

1978

Language:

english

File:

PDF, 277 KB

english, 1978

34

Total syntheses of dl-mesembrine, dl-dihydromaritidine and dl-epi-dihydromaritidine via regioselective NaBH4/H+ reduction of imides

J.B.P.A. Wijnberg, W.N. Speckamp

Journal:

Year:

1978

Language:

english

File:

PDF, 821 KB

english, 1978

35

New total synthesis of dl-physostigmine (dl-eserine) via regioselective NaBH4-reduction of imides

J.B.P.A. Wijberg, W.N. Speckamp

Journal:

Year:

1978

Language:

english

File:

PDF, 689 KB

english, 1978

36

Stereocontrolled synthesis of functionalized 1-azaspirans : Efficient synthesis of perhydrohistrionicotoxin

H.E. Schoemaker, W.N. Speckamp

Journal:

Year:

1980

Language:

english

File:

PDF, 946 KB

english, 1980

37

Olefin cyclisations of hindered α-acyliminium ions

B.P. Wijnberg, W.N. Speckamp, A.R.C. Oostveen

Journal:

Year:

1982

Language:

english

File:

PDF, 746 KB

english, 1982

38

Intermolecular reacitons of N-alkoxycarbonyliminium ions with propargyltrimethylsilane; oxazinone versus allene formation

Peter M. Esch, Henk Hiemstra, W. Nico Speckamp

Journal:

Year:

1992

Language:

english

File:

PDF, 1.43 MB

english, 1992

39

Heterocyclic steroids XVI A new synthesis of 13-aza-estrone

W.N. Speckamp, R.J.P. Barends, A.J. de Gee, H.O. Huisman

Journal:

Tetrahedron Letters

Year:

1970

Language:

english

File:

PDF, 189 KB

english, 1970

40

Lewis acid induced reactions of propargyl trimethyl silane with ω-ethoxy lactams synthesis of γ-allenyl-GABA

Henk Hiemstra, Hendrikus P. Fortgens, W. Nico Speckamp

Journal:

Tetrahedron Letters

Year:

1984

Language:

english

File:

PDF, 190 KB

english, 1984

41

Palladium-catalyzed synthesis of amides and peptides

Eric C. Roos, Pablo Bernabé, Henk Hiemstra, W.Nico Speckamp, Bernard Kaptein, Wilhelmus H.J. Boesten

Journal:

Tetrahedron Letters

Year:

1991

Language:

english

File:

PDF, 273 KB

english, 1991

42

Palladium-catalyzed reactions with N,N′-diallyloxycarbonylhydrazines

Floris P.J.T. Rutjes, Manuel M. Paz, Henk Hiemstra, W.Nico Speckamp

Journal:

Tetrahedron Letters

Year:

1991

Language:

english

File:

PDF, 292 KB

english, 1991

43

Synthesis of oxacyclic carboxylic esters through ring closure of α-alkoxy ester free radicals

Lucie D.M. Lolkema, Henk Hiemstra, Al Ayachi Al Ghouch, W. Nico Speckamp

Journal:

Tetrahedron Letters

Year:

1991

Language:

english

File:

PDF, 187 KB

english, 1991

44

Copper catalyzed chlorine transfer cyclizations of glycine and glycolic acid derivatives

Jan H. Udding, Henk Hiemstra, Marco N.A. van Zanden, W.Nico Speckamp

Journal:

Tetrahedron Letters

Year:

1991

Language:

english

File:

PDF, 292 KB

english, 1991

45

Formamide as a superior nitrogen nucleophile in palladium(II) mediated synthesis of imidazolidines

Rolf A.T.M. van Benthem, Henk Hiemstra, Gema Rodríguez Longarela, W.Nico Speckamp

Journal:

Tetrahedron Letters

Year:

1994

Language:

english

File:

PDF, 327 KB

english, 1994

46

Stereoselective carbon-carbon bond formation via allylic N-sulfonyliminium ions

Johan C.P. Hopman, Eelco van den Berg, Lourdes Ollero Ollero, Henk Hiemstra, W. Nico Speckamp

Journal:

Tetrahedron Letters

Year:

1995

Language:

english

File:

PDF, 241 KB

english, 1995

47

Palladium(0)-catalyzed coupling reactions of an N-tosylpyrrolidinone-derived enamine triflate

Pablo Bernabé, Floris P.J.T. Rutjes, Henk Hiemstra, W.Nico Speckamp

Journal:

Tetrahedron Letters

Year:

1996

Language:

english

File:

PDF, 262 KB

english, 1996

48

Synthesis and reactivity of pyrrolidinone- and piperidinone-derived enol triflates

Tim Luker, Henk Hiemstra, W.Nico Speckamp

Journal:

Tetrahedron Letters

Year:

1996

Language:

english

File:

PDF, 288 KB

english, 1996

49

New Developments in the Chemistry of N-Acyliminium Ions and Related Intermediates

W.Nico Speckamp, Marinus J. Moolenaar

Journal:

Year:

2000

Language:

english

File:

PDF, 617 KB

english, 2000

50

Synthesis of bridged bicyclic hydrazines via endocyclic N-acylhydrazonium intermediates: A novel route to the 1-Azatropane skeleton

Floris P.J.T Rutjes, Henk Hiemstra, Frank O.H Pirrung, W.Nico Speckamp

Journal:

Year:

1993

Language:

english

File:

PDF, 1.77 MB

english, 1993