Organocatalytic Approach to Enantioselective One-Pot Synthesis of Pyrrolidine, Hexahydropyrrolizine, and Octahydroindolizine Core Structures
摘要:
An enantioselective organocatalytic, one-pot synthesis of pyrrolidine, hexahydropyrrolizine, and octahydroindolizine core structures was realized starting from readily available glycine esters by combination with several different organocatalytic reactions.
Enantioselective solution- and solid-phase synthesis of glutamic acid derivatives via Michael addition reactions
作者:Martin J. O'Donnell、Francisca Delgado、Esteban Domı́nguez、Jesús de Blas、William L. Scott
DOI:10.1016/s0957-4166(01)00116-1
日期:2001.4
base ester derivatives to Michael acceptors either in solution (56–89% e.e.) or on solid-phase (34–82% e.e.) gave optically active unnatural α-amino acid derivatives. The reaction was conducted in the presence of chiral, non-racemic quaternary salts derived from the cinchonaalkaloids using neutral, non-ionic phosphazene bases.
[EN] NOVEL PHASE TRANSFER CATALYSTS<br/>[FR] NOUVEAUX CATALYSEURS DE TRANSFERT DE PHASE
申请人:UNIV SINGAPORE
公开号:WO2012057709A1
公开(公告)日:2012-05-03
Compounds of formula (I): wherein R1 to R8, and X- are defined herein. Also disclosed are methods of making and using these compounds.
式(I)的化合物:其中R1至R8和X-在此定义。还公开了制备和使用这些化合物的方法。
Asymmetric Michael Reaction Promoted by New Chiral Phase-Transfer Catalysts
作者:Shigeru Arai、Kazuyuki Tokumaru、Toyohiko Aoyama
DOI:10.1248/cpb.52.646
日期:——
A catalytic asymmetric Michael reaction promoted by new chiral quaternary ammonium salts is described. The products are obtained with moderate ee (up to 75% ee), and the enantioselectivity is strongly dependent on both the substituents on the aromatic rings and the ammonium moiety in the catalysts.
Highly enantioselective synthesis of cyclic and functionalized α-amino acids by means of a chiral phase transfer catalyst
作者:E.J Corey、Mark C Noe、Feng Xu
DOI:10.1016/s0040-4039(98)01067-3
日期:1998.7
The chiral quaternary ammonium salt 1 serves as phase transfer catalyst for the enantioselective conversion of the glycine derivative 2 to a variety of cyclic and acyclic chiral α-amino acids with enantioselectivities as high as 200:1 in alkylation and Michaeladditionreactions.