作者:P. Veeraraghavan Ramachandran、Henry J. Hamann
DOI:10.1021/acs.orglett.1c00591
日期:2021.4.16
Ammonia-borane serves as an efficient substoichiometric (10%) precatalyst for the direct amidation of both aromatic and aliphatic carboxylic acids. In situ generation of amine-boranes precedes the amidation and, unlike the amidation with stoichiometric amine-boranes, this process is facile with 1 equiv of the acid. This methodology has high functional group tolerance and chromatography-free purification
氨硼烷可作为芳族和脂族羧酸直接酰胺化的有效亚化学计量(10%)预催化剂。胺-硼烷的原位生成是在酰胺化之前进行的,与化学计量的胺-硼烷的酰胺化不同,此过程易于加入1当量的酸。该方法具有较高的官能团耐受性和无色谱法纯化,但不适合酯化。已经开发了后者的特征以制备含羟基和硫醇的酰胺。