Stereoselective epoxidation of vinyl sulfones and N-( p-tolylsulfonyl)vinylsulfoximines derived from isopropylideneglyceraldehyde: synthesis of chiral building blocks
Effects of additional stereogenic centres and cation in the nucleophilic epoxidation of vinylsulfoximines with metal alkylperoxides
作者:Andrew D. Briggs、Richard F.W. Jackson、William Clegg、Mark R.J. Elsegood、Josephine Kelly、Paul A. Brown
DOI:10.1016/0040-4039(94)85048-8
日期:1994.9
Epoxidation of vinylsulfoximines using metalalkylperoxides proceeds with varying degrees of stereoselectivity, depending both on the metalcation and the steric bulk of the alkyl group. The stereochemical outcome of the epoxidation of substrates bearing an allylic asymmetric centre is also dependent on the epoxidising agent, and very high levels of stereoselectivity may be obtained in the formation
1,3-Dipolar Cycloadditions of Diazomethane to Chiral Electron-Deficient Olefins: The Origin of the π-Facial Diastereoselection
作者:Elena Muray、Angel Alvarez-Larena、Joan F. Piniella、Vicenç Branchadell、Rosa M. Ortuño
DOI:10.1021/jo991227j
日期:2000.1.1
The stereochemical outcome of diazomethane cycloadditions to several chiral electron-deficientolefins has been investigated in order to establish the origin of the pi-facial diastereoselection. Nitro olefins, vinyl sulfones, enoates, and 2-amino enoates have been used for such a purpose. These substrates have been prepared from D-glyceraldehyde acetonide through Wittig-type condensations and present
A short synthesis of the HIV-protease inhibitor nelfinavir via a diastereoselective addition of ammonia to the α,β-unsaturated sulfoxide derived from ( R )-glyceraldehyde acetonide
作者:Dawei Ma、Bin Zou、Wei Zhu、Huadong Xu
DOI:10.1016/s0040-4039(02)02077-4
日期:2002.11
Diastereoselective Michael addition of ammonia to sulfoxide 3a derived from (R)-glyceraldehyde acetonide provides amine 4a, which is converted into Nelfinavir using (BF3Et2O)-Et-./Nal reduction and subsequent coupling reactions as key steps. (C) 2002 Elsevier Science Ltd. All rights reserved.
Briggs Andrew D., Jackson Richard F. W., Clegg William, Elsegood Mark R. +, Tetrahedron Lett, 35 (1994) N 37, S 6945-6948
作者:Briggs Andrew D., Jackson Richard F. W., Clegg William, Elsegood Mark R. +