Construction of 3-amino-2-oxindoles by direct amination of aniline or α-amino-acid derivatives to 3-bromooxindoles
作者:Min Zhao、Nai-Kai Li、Ya-Fei Zhang、Feng-Feng Pan、Xing-Wang Wang
DOI:10.1016/j.tet.2016.01.039
日期:2016.3
The asymmetric amination of anilines to 3-bromooxindoles was developed in the presence of a bis(oxazoline)-Ni(dppp)Cl2 complex, to provide enantiomerically enriched 3-amino-2-oxindoles with quaternary stereocenters in up to 90% yield with 92:8 er. Simultaneously, direct stereoselective amination of α-amino-acid methyl esters to 3-bromooxindoles was also accomplished without any catalysts, which furnished
在双(恶唑啉)-Ni(dppp)Cl 2络合物的存在下,苯胺向3-溴恶吲哚的不对称胺化反应得以发展,以提供对映体富集的具有季立体中心的对映异构体富集的3-氨基-2-氧吲哚,产率高达90%, 92:8 er。同时,在没有任何催化剂的情况下,也完成了α-氨基酸甲酯对3-溴代吲哚的直接立体选择性胺化,这为3-氨基-2-氧吲哚衍生物提供了高收率和中等的非对映选择性。