Ytterbium triflate-catalyzed reactions of imines with a chiral non-racemic silyloxypyrrole
摘要:
In the presence of a catalytic amount of ytterbium triflate the reactions of various aromatic imines with a chiral non-racemic silyloxypyrrole proceeded smoothly to afford the corresponding aldol-type adducts in go od yields and diastereoselectivities. (C) 2000 Elsevier Science Ltd. All rights reserved.
Muricatacin is a hydroxy butanolide extracted from Annona muricata, and has shown cytotoxic activity. The threo and erythro aza-analogues, namely the hydroxy pyrrolidones have been synthesized through two different routes.
Stereoselective synthesis of 4,5-disubstituted pyrrolidin-2-ones by cuprate addition to chiral non racemic α,β-unsaturated-γ-lactams
作者:Isabelle Baussanne、Jacques Royer
DOI:10.1016/s0040-4039(97)10746-8
日期:1998.2
A new access to enantiopure 4,5-disubstituted pyrrolidin-2-ones has been developed from chiral non racemic alpha,beta-unsaturated-gamma-lactams. Conjugate addition of Gilman-type cuprates results in trans addition with excellent diastereoselectivity. (C) 1998 Elsevier Science Ltd. All rights reserved.
Ytterbium triflate-catalyzed reactions of imines with a chiral non-racemic silyloxypyrrole
作者:Bruno Dudot、Jacques Royer、Mireille Sevrin、Pascal George
DOI:10.1016/s0040-4039(00)00625-0
日期:2000.6
In the presence of a catalytic amount of ytterbium triflate the reactions of various aromatic imines with a chiral non-racemic silyloxypyrrole proceeded smoothly to afford the corresponding aldol-type adducts in go od yields and diastereoselectivities. (C) 2000 Elsevier Science Ltd. All rights reserved.
Asymmetric routes towards polyfunctionalized pyrrolidines: Synthesis and reactivity of a chiral silyloxypyrrole
作者:Isabelle Baussanne、Jacques Royer
DOI:10.1016/0040-4039(95)02388-7
日期:1996.2
Starting from O-protected (R)-(−)-phenylglycinol, chiral silyloxypyrrole 5 was prepared in two steps and its reaction with achiral aldehydes under Mukaiyama's reaction conditions was investigated. Addition occurred at the C-5 position of the pyrrolidine ring with complete lk selectivity (except in the case of acetaldehyde) and a modarate to good diastereofacial (RR vs SS) selectivity.