Synthesis of α-fluoro-β-hydroxy esters by an enantioselective Reformatsky-type reaction
作者:Michal Fornalczyk、Kuldip Singh、Alison M. Stuart
DOI:10.1039/c2cc17985g
日期:——
The first enantioselective Reformatsky-type reaction of ethyl iodofluoroacetate has been accomplished with alkyl aryl ketones. High diastereoselectivities and excellent enantioselectivities for the major diastereomer (93â95% ee) were achieved with large alkyl groups. For smaller alkyl groups the diastereoselectivities were moderate, but excellent enantioselectivities were obtained for both diastereomers (79â94% ee).
Catalyzed Reformatsky Reactions with Ethyl Bromofluoroacetate for the Synthesis of α-Fluoro-β-hydroxy Acids
作者:R. Ocampo、W. R. Dolbier,、K. A. Abboud、F. Zuluaga
DOI:10.1021/jo015778x
日期:2002.1.1
The presence of catalytic amounts of CeCl(3) improves yields and simplifies procedure in the Reformatskyreactions of ethyl bromofluoroacetate with aldehydes and ketones to generate diastereomeric mixtures of alpha-fluoro-beta-hydroxy esters, some of which can be separated by crystallization or column flash chromatography. Diastereomerically pure alpha-fluoro-beta-hydroxy acids are obtained by mild