Ni-Catalyzed Reductive Coupling of Alkyl Acids with Unactivated <i>Tertiary</i> Alkyl and Glycosyl Halides
作者:Chenglong Zhao、Xiao Jia、Xuan Wang、Hegui Gong
DOI:10.1021/ja510653n
日期:2014.12.17
highlights Ni-catalyzed reductive coupling of alkyl acids with alkyl halides, particularly sterically hindered unactivated tertiary alkyl bromides for the production of all carbon quaternary ketones. The reductive strategy is applicable to α-selective synthesis of saturated, fully oxygenated C-acyl glycosides through easy manipulations of the readily available sugar bromides and alkyl acids, avoiding otherwise
这项工作突出了烷基酸与烷基卤化物的 Ni 催化还原偶联,特别是用于生产所有碳季酮的空间位阻未活化叔烷基溴化物。该还原策略适用于通过容易获得的溴化糖和烷基酸的简单操作来 α 选择性合成饱和的、完全氧化的 C-酰基糖苷,避免了其他困难的多步转化。初步的机理研究表明自由基链机制(循环 B,方案 1)可能是合理的,其中 MgCl2 促进 Ni(II) 配合物的还原。