作者:Jian-Xing Xu、Xiao-Feng Wu
DOI:10.1021/acs.joc.9b01007
日期:2019.8.16
simple, cheap, and air-stable cobalt(II) bromide as the catalyst, combined with pyrazole and catalytic amount of manganese, active cobalt complex can be generated in situ and can catalyze various epoxides to give the corresponding β-hydroxyesters in moderate to excellent yields. Mechanism studies indicate that pyrazole plays a crucial role in this reaction. Moreover, with the addition of the catalytic
本文中,我们开发了一种新的实用的催化体系,用于β-羟基酯的羰基合成。通过使用简单,廉价且空气稳定的溴化钴(II)作为催化剂,与吡唑和催化量的锰结合使用,可以原位生成活性钴络合物,并且可以催化各种环氧化物,以适度的速度生成相应的β-羟基酯达到优异的产量。机理研究表明,吡唑在该反应中起关键作用。此外,通过添加催化量的锰,可以再生活性钴催化剂,这提供了重新使用钴催化剂的可能性。