作者:Helena Lundberg、Hans Adolfsson
DOI:10.1021/acscatal.5b00385
日期:2015.6.5
[Hf(Cp)2Cl2], as catalyst. Amino acids are transformed into their corresponding amides without racemization, and the catalyst displays full selectivity for the amidation of carboxylic acids over esters. Electronic properties of the carboxylic acids were found to have a strong influence on the rate of the amidation reaction, and the need for a balanced amount of molecular sieves was observed to be
本文介绍了在环境温度(26°C)下直接酰胺化未活化羧酸的金属催化方案的第一个例子。温和的反应条件,使用市售的[络合物[Hf(Cp)2 Cl 2 ]作为催化剂,可在短至90分钟的反应时间内获得高产率的一系列酰胺。氨基酸不消旋地转化为它们相应的酰胺,催化剂对羧酸酰胺上酯的酰胺化显示出完全的选择性。发现羧酸的电子性质对酰胺化反应的速率有很大的影响,并且观察到需要平衡量的分子筛对于获得最佳反应结果非常重要。