Metalated nitriles and enolates rapidly and efficiently abstract chlorine from 2-chloro-2-fluoro-2-phenylacetonitrile to afford a diverse range of chloronitriles and chloroesters. The method provides the first general anionic chlorination of alkylnitriles, tolerates numerous functional groups, and addresses the challenge of synthesizing alpha-chloronitriles under mild conditions.
A process for the preparation of silyl ketene acetals of the formula,
R₂C=C(OSiRnX3-n) (OZ) or
The process comprises contacting an alpha-ester of a carboxylic acid with an alkali metal in the presence of an excess of an organohalosilane, wherein the alpha-ester has the formula,
and the organohalosilane has the formula RnSiX4-n;
and facilitating reaction among the alpha-ester, the alkali metal and the organochlorosilane to form the silyl ketene acetal and an alkali metal halide or an alkali metal alkoxide.
Abramov,V.S.; Il'ina,N.A., Journal of general chemistry of the USSR, 1969, vol. 39, p. 974 - 978
作者:Abramov,V.S.、Il'ina,N.A.
DOI:——
日期:——
US4783543A
申请人:——
公开号:US4783543A
公开(公告)日:1988-11-08
Metalated Nitrile and Enolate Chlorinations
作者:Bhaskar Reddy Pitta、Fraser F. Fleming
DOI:10.1021/ol100897y
日期:2010.6.18
Metalated nitriles and enolates rapidly and efficiently abstract chlorine from 2-chloro-2-fluoro-2-phenylacetonitrile to afford a diverse range of chloronitriles and chloroesters. The method provides the first general anionic chlorination of alkylnitriles, tolerates numerous functional groups, and addresses the challenge of synthesizing alpha-chloronitriles under mild conditions.
An unprecedented Cr-catalyzed asymmetric Reformatsky reaction of aldehydes with α-chlorinated esters and amides has been developed, providing modular access to valuable chiral β-hydroxy carbonyl compounds.