A General Procedure for the Esterification of Carboxylic Acids with Diazoalkanes Generated in Situ by the Oxidation of <i>N</i>-<i>tert</i>-Butyldimethylsilylhydrazones with (Difluoroiodo)benzene
作者:Michael E. Furrow、Andrew G. Myers
DOI:10.1021/ja0459779
日期:2004.10.1
bimolecular reaction of carboxylic acids with diazoalkanes to form esters is among the mildest and most efficient of organic transformations but is seldom used in synthesis beyond the important case of methyl esterification. This is largely a consequence of the inaccessibility and poor stability of higher diazoalkanes as substrates. In this work we describe a new method for the synthesis of diazoalkanes by
羧酸与重氮烷烃形成酯的双分子反应是最温和和最有效的有机转化之一,但除了重要的甲基酯化反应外,很少用于合成。这在很大程度上是由于作为底物的高级重氮烷烃难以接近且稳定性差的结果。在这项工作中,我们描述了一种通过用(二氟碘)苯氧化 N-叔丁基二甲基甲硅烷基腙 (TBSH) 来合成重氮烷烃的新方法,这是一种迄今为止未在腙氧化的背景下探索的试剂。当在羧酸底物存在下进行时,氧化导致有效的原位酯化。除了大大扩展了现在可用于酯化的重氮烷烃的范围之外,