Iodine catalyzed synthesis of 2,5-substituted oxazoles from N-arylethylamides through intramolecular C(sp3)–H functionalization under metal-free conditions is described.
A one-potfacilesynthesis of disubstituted oxazoles has been achieved from vinyl azide and benzylamine. A coherent mixture of iodine and tert-butyl hydroperoxide (TBHP) efficiently promoted oxidative cascade cyclization to construct 2,5-disubstitutedoxazoles under aerobic conditions. Notably, the oxidative cyclization involves feasible C(sp3)-functionalization with the elimination of the azide group
Electrochemical construction of 2,5-diaryloxazoles via N–H and C(sp3)-H functionalization
作者:Tong Li、Leping Pan、Yan Zhang、Jihu Su、Kai Li、Kuiliang Li、Hu Chen、Qi Sun、Zhiyong Wang
DOI:10.1016/j.cclet.2023.108897
日期:2024.4
An efficient NH and C(sp)-H functionalization of aryl ketones with benzylamines/amino acids was developed under mild conditions by virtue of anodic oxidation. A variety of functionalized 2,5-diaryloxazoles were obtained with good to excellent yields. Moreover, some important natural products can be prepared by this method. The reaction features a broad substrate scope, scalability, metal-free and chemical