Cobalt‐Catalyzed Selective Transformation of Levulinic Acid and Amines into Pyrrolidines and Pyrrolidinones using Hydrogen
作者:Yixiao Pan、Zhenli Luo、Ji Yang、Jiahong Han、Jianbo Yang、Zhen Yao、Lijin Xu、Peng Wang、Qian Shi
DOI:10.1002/adsc.202200578
日期:2022.8.16
Cobalt-catalyzed selective transformation of levulinic acid and primary amines into pyrrolidines and pyrrolidinones under H2 has been developed. The catalyst system consisting of Co(NTf2)2, 1,1,1-tris(di(4-methoxyphenyl)phosphinomethyl) ethane ((p-anisyl)triphos) and Me3SiOTf works well for the synthesis of pyrrolidines via reductive amination/cyclization/deoxygenative reduction of amide, and using Co(NTf2)2/1
已经开发了在 H 2下钴催化的乙酰丙酸和伯胺选择性转化为吡咯烷和吡咯烷酮。由Co(NTf 2 ) 2、1,1,1-三(二(4-甲氧基苯基)膦甲基)乙烷((对茴香基)三膦)和Me 3 SiOTf组成的催化剂体系适用于通过还原反应合成吡咯烷酰胺的胺化/环化/脱氧还原,并使用Co(NTf 2 ) 21,1,1-三(二苯基膦基甲基)乙烷(triphos)在氢气减压下作为催化剂导致仅形成吡咯烷酮。芳基和烷基伯胺都是合适的底物,并且可以容忍多种官能团。同时,4-氧代-4-芳基丁酸、5-氧代己酸、6-氧代庚酸、2-甲酰基苯甲酸、2-乙酰基苯甲酸和2'-乙酰基-[1,1'-联苯]-2-羧酸是也适用,允许方便地获得具有不同环大小的环胺和内酰胺。