Facile One-Pot Procedure for Et<sub>3</sub>Al-Promoted Asymmetric Pinacol-Type Rearrangement
作者:Keisuke Suzuki、Tomoichi Shionhara
DOI:10.1055/s-2003-36266
日期:——
A facile procedure for the synthesis of enantiomerically pure α-substituted ketones is described. The pinacol-type 1,2-shift of sec-tert 1,2-diols could be effected by performing the following two processes in a one pot procedure, (1) regioselective methanesulfonylation, and (2) direct treatment of the resulting mesylate with Et3Al. This procedure allowed 1,2-shift reactions of various groups, including vinyl, aryl, and heteroaromatic groups, giving enantiomerically pure ketones in high yields.
描述了合成对映体纯α-取代酮的简便程序。仲叔1,2-二醇的频哪醇型1,2-转变可通过在一锅法中进行以下两个过程来实现,(1)区域选择性甲磺酰化,和(2)直接处理所得甲磺酸酯三乙胺。该过程允许各种基团(包括乙烯基、芳基和杂芳基)发生 1,2-位移反应,以高产率得到对映体纯的酮。