The Chemistry of Trichlorosilyl Enolates. Aldol Addition Reactions of Methyl Ketones
作者:Scott E. Denmark、Robert A. Stavenger
DOI:10.1021/ja001023g
日期:2000.9.1
observed in this uncatalyzed aldol process. The aldol additions are dramatically accelerated by the addition of catalytic quantities of chiral phosphoramides, particularly one derived from N,N‘-dimethylstilbene-1,2-diamine. In this catalyzed mode, good to high enantioselectivities are obtained with a variety of achiral trichlorosilyl enolates and aldehydes. When either partner bears a stereogenic center
Lewis Base-Catalyzed, Asymmetric Aldol Additions of Methyl Ketone Enolates
作者:Scott E. Denmark、Robert A. Stavenger、Ken-Tsung Wong
DOI:10.1021/jo972168h
日期:1998.2.1
Enantioselective Mukaiyama-aldol and aldol-dihydropyrone annulation reactions catalyzed by a tryptophan-derived oxazaborolidine
作者:E.J. Corey、Charles L. Cywin、Thomas D. Roper
DOI:10.1016/s0040-4039(00)60892-4
日期:1992.11
The (S)-tryptophan derived catalyst 1, has been used to effect enantioselective Mukaiyama-aldol and aldol-dihydropyrone annulation reactions of trimethylsilyloxy olefins and, dienes.
Synthesis of Enantiomerically Pure β-Hydroxy Ketones via β-Keto Weinreb Amides by a Condensation/Asymmetric-Hydrogenation/Acylation Sequence
作者:Julian Diehl、Reinhard Brückner
DOI:10.1002/ejoc.201601202
日期:2017.1.10
an ester/amide exchange, and the use of the resulting β-hydroxy amide for the acylation of an organometallic compound. We shortened this route by showing that β-keto Weinreb amides are hydrogenated with up to 99 % ee in the presence of [Me2NH2]+[RuCl(S)-BINAP]2(µ-Cl)3}– (0.5 mol-%) at room temp./5 bar. These Weinreb amides were prepared by seemingly obvious yet unprecedented condensations of lithiated