Sterically Demanding Oxidative Amidation of α-Substituted Malononitriles with Amines Using O<sub>2</sub>
作者:Jing Li、Martin J. Lear、Yujiro Hayashi
DOI:10.1002/anie.201603399
日期:2016.7.25
An efficient amidation method between readily available 1,1-dicyanoalkanes and either chiral or nonchiral amines was realized simply with molecular oxygen and a carbonate base. This oxidative protocol can be applied to both sterically and electronically challenging substrates in a highly chemoselective, practical, and rapid manner. The use of cyclopropyl and thioether substrates support the radical
简单地使用分子氧和碳酸盐碱即可实现易于获得的1,1-二氰基烷烃与手性或非手性胺之间的高效酰胺化方法。该氧化方案可以高度化学选择性,实用和快速的方式应用于空间和电子挑战性底物。环丙基和硫醚底物的使用可支持α-过氧丙二腈物种的自由基形成,后者可以环化成二恶英,后者可以单价氧化丙二腈α-碳二酮以提供能够与胺亲核试剂反应的活化的酰基氰化物。