An Efficient Synthesis of 2-Bromo-3-hydroxy Esters by Reaction of Ketones with Ethyl Dibromoacetate Promoted by Samarium Diiodide
作者:José M. Concellón、Carmen Concellón、Pamela Diaz
DOI:10.1002/ejoc.200500940
日期:2006.5
A simple and efficient samarium diiodide mediated synthesis of 2-bromo-3-hydroxy esters 1 by the reaction of a variety of ketones 2 with ethyl dibromoacetate (3) is described. The relative configuration of the major diastereoisomer obtained was established by NOESY experiments of the corresponding α,β-epoxy esters 4 prepared from 1. Additionally, a mechanism is proposed to explain the results obtained
描述了一种通过各种酮 2 与二溴乙酸乙酯 (3) 反应的简单而有效的二碘化钐介导的 2-溴-3-羟基酯 1 合成。获得的主要非对映异构体的相对构型是通过从 1 制备的相应 α,β-环氧酯 4 的 NOESY 实验建立的。此外,提出了一种机制来解释所获得的结果。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)