Hypervalent λ<sup>3</sup>-Bromane Strategy for Baeyer−Villiger Oxidation: Selective Transformation of Primary Aliphatic and Aromatic Aldehydes to Formates, Which is Missing in the Classical Baeyer−Villiger Oxidation
作者:Masahito Ochiai、Akira Yoshimura、Kazunori Miyamoto、Satoko Hayashi、Waro Nakanishi
DOI:10.1021/ja104330g
日期:2010.7.14
undergoes BV rearrangement and produces an ester via facile reductive elimination of an aryl-lambda(3)-bromanyl group, because of the hypernucleofugality. The novel strategy makes it possible to induce selectively the BV rearrangement of straight chain primary aliphatic as well as aromatic aldehydes, which is missing in the classical BVO: for instance, octanal and benzaldehyde afforded rearranged formate
Baeyer-Villiger 氧化 (BVO) 的概念独特的现代策略被开发出来。我们的新方法涉及将水初始水合为羰基化合物,然后将溴烷 (III) 上的高价芳基-λ(3)-溴烷与所得水合物进行配体交换,从而产生一种新型的活化 Criegee 中间体。由于超核,中间体经历 BV 重排并通过芳基-λ(3)-溴基的轻松还原消除产生酯。这种新策略可以选择性地诱导直链脂肪族和芳香族伯醛的 BV 重排,这在经典 BVO 中是缺失的:例如,辛醛和苯甲醛提供了高选择性(> 95%)的重排甲酸酯我们的条件,而尝试的经典 BVO 仅产生羧酸。这牢固地确立了 BVO 新方法论的强大性质。