Chiral <i>N</i>
,<i>N</i>
′-Dioxide/Scandium(III)-Catalyzed Asymmetric Alkylation of <i>N</i>
-Unprotected 3-Substituted Oxindoles
作者:Changqiang He、Weidi Cao、Jianlin Zhang、Shulin Ge、Xiaoming Feng
DOI:10.1002/adsc.201800877
日期:2018.11.16
An efficient enantioselective alkylation of N‐unprotected 3‐substituted oxindoles was realized by using a chiral N,N′‐dioxide/scandium(III) complex as the catalyst. A wide range of 3,3‐dialkyl substituted oxindoles with quaternary stereocenters were obtained in high yields and ee values (up to 98% yield and 99% ee).
通过使用手性N,N'-二氧化物/ scan(III)络合物作为催化剂,可以实现N未保护的3-取代的羟吲哚的有效对映选择性烷基化。以高收率和ee值(高达98%的收率和ee的99%)获得了具有季立体中心的各种3,3-二烷基取代的羟吲哚。