Photoinduced, Copper-Catalyzed Decarboxylative C–N Coupling to Generate Protected Amines: An Alternative to the Curtius Rearrangement
作者:Wei Zhao、Ryan P. Wurz、Jonas C. Peters、Gregory C. Fu
DOI:10.1021/jacs.7b07546
日期:2017.9.6
classic, powerful method for converting carboxylic acids into protected amines, but its widespread use is impeded by safety issues (the need to handle azides). We have developed an alternative to the Curtius rearrangement that employs a copper catalyst in combination with blue-LED irradiation to achieve the decarboxylativecoupling of aliphatic carboxylic acid derivatives (specifically, readily available
Curtius 重排是将羧酸转化为受保护胺的经典、强大的方法,但其广泛使用受到安全问题(需要处理叠氮化物)的阻碍。我们开发了 Curtius 重排的替代方案,它采用铜催化剂与蓝光 LED 照射相结合,实现脂肪族羧酸衍生物(特别是容易获得的 N-羟基邻苯二甲酰亚胺酯)的脱羧偶联,在温和条件下提供受保护的胺。这种 CN 键形成过程与多种官能团兼容,包括醇、醛、环氧化物、吲哚、硝基烷烃和硫化物。控制反应和机理研究与铜物种参与光化学和关键键形成步骤的假设一致,
An efficient synthesis of N-substituted phthalimides using SiO2-tpy-Nb as heterogeneous and reusable catalyst
A novel and efficient heterogeneous catalyst SiO2-tpy-Nb was developed, and its application in the preparation of N-substituted phthalimides from o-phthalic acids or anhydrides with amines provides the desired products in good to excellent yields. The catalyst was stable and recoverable for eight consecutive cycles without a significant loss in its activity. Furthermore, the catalyst is applicable