Chelation-controlled ester-derived titanium enolate aldol reaction: diastereoselective syn-aldols with mono- and bidentate aldehydes
摘要:
A chelation-controlled and highly diastereoselective synthesis of syn-aldols is described. Aldol reaction of (S)-valinolderived ester with a variety of aldehydes proceeded with high syn-diastercoselectivities (up to 99:1) and isolated yields (94%). (C) 2002 Elsevier Science Ltd. All rights reserved.
Ester derived titanium enolate aldol reaction: chelation controlled diastereoselective synthesis of syn -aldols
作者:Arun K Ghosh、Jae-Hun Kim
DOI:10.1016/s0040-4039(00)02227-9
日期:2001.2
A chelation controlled and highly diastereoselective synthesis of syn-aldols is described. Aldol reaction of commercially available l-phenylalaninol derived esters with a variety of bidentate oxyaldehydes proceeded with excellent syn-diastereoselectivities and isolated yields.
Enantioselective Monoreduction of 2-Alkyl-1,3-diketones Mediated by Chiral Ruthenium Catalysts. Dynamic Kinetic Resolution
作者:Florence Eustache、Peter I. Dalko、Janine Cossy
DOI:10.1021/ol025527q
日期:2002.4.1
The reduction of 2-alkyl-1,3-diketones using (R,R)- or (S,S)-RuCl[N-(tosyl)-1,2-diphenylethylenediamine](p-cymene) in the presence of formic acid and triethylamine affords syn-2-alkyl-3-hydroxy ketones as the major products with high enantioselectivity. [reaction: see text]