A Simple and Efficient Method for Transesterification of β-Keto Esters Catalyzed by Cesium Fluoride
作者:Tsuneo Sato、Nobuyuki Inahashi、Takashi Fujiwara
DOI:10.1055/s-2008-1032071
日期:——
Cesium fluoride is found to be an efficient and reusable catalyst for the transesterification of β-ketoesters with various alcohols in good to high yields.
Bakers’ yeast reduces esters of 2-alkyl-3-oxobutanoic acid (CH3COCHRCO2R′; R=methyl, ethyl, propyl, propargyl, and allyl) into the corresponding (S)-hydroxy esters with exclusive stereoselectivity, while the configuration at the 2-position of the hydroxy esters is either S (anti) or R (syn) depending on the structure of the alkoxyl group in the carboalkoxyl moiety of the ester. Oftenly, the stereoselectivity