2,4,6-Trihydroxybenzoic Acid-Catalyzed Oxidative Ugi Reactions with Molecular Oxygen via Homo- and Cross-Coupling of Amines
作者:Chun-ping Dong、Akinori Uematsu、Shun Kumazawa、Yuki Yamamoto、Shintaro Kodama、Akihiro Nomoto、Michio Ueshima、Akiya Ogawa
DOI:10.1021/acs.joc.9b01422
日期:2019.9.20
Metal-free, oxidative four-component Ugi reactions (U-4CRs) were conducted to synthesize dipeptides from two different amines, isocyanides, and carboxylic acids using 2,4,6-trihydroxybenzoic acid catalyst in O2 atmosphere. The organocatalytic U-4CRs proceed via oxidative cross-coupling of benzylamines with other aliphatic or aromatic amines to form imines, followed by condensation with isocyanides
在O 2气氛中,使用2,4,6-三羟基苯甲酸催化剂,进行了无金属的氧化性四组分Ugi反应(U-4CR),由两种不同的胺,异氰酸酯和羧酸合成二肽。有机催化的U-4CR通过苄胺与其他脂肪族或芳香族胺的氧化交叉偶联反应形成亚胺,然后与异氰酸酯和羧酸缩合。通过胺的交叉偶联的U-4CR很少见,并且简单,无金属的方法对于进一步应用在药物和杂环合成中是有利的。