A Practical and General Amidation Method from Isocyanates Enabled by Flow Technology
作者:Jason D. Williams、William J. Kerr、Stuart G. Leach、David M. Lindsay
DOI:10.1002/anie.201807393
日期:2018.9.10
The addition of carbon nucleophiles to isocyanates represents a conceptually flexible and efficient approach to the preparation of amides. This general synthetic strategy has, however, been relatively underutilized owing to narrow substrate tolerance and the requirement for less favourable reaction conditions. Herein, we disclose a high‐yielding, mass‐efficient, and scalable method with appreciable
将碳亲核试剂加至异氰酸酯代表了制备酰胺的概念上灵活且有效的方法。然而,由于窄的底物耐受性和对较不利的反应条件的要求,这种通用的合成策略尚未得到充分利用。本文中,我们公开了一种高产率,质量高效且可扩展的方法,该方法通过格氏试剂与异氰酸酯的反应形成酰胺,具有相当的官能团耐受性。通过流动化学的应用和亚化学计量量的CuBr 2的使用,已开发出该方法以涵盖广泛的底物,包括发现与先前公布的程序不兼容的反应物。