Enantioselective Radical Construction of 5-Membered Cyclic Sulfonamides by Metalloradical C–H Amination
作者:Yang Hu、Kai Lang、Chaoqun Li、Joseph B. Gill、Isaac Kim、Hongjian Lu、Kimberly B. Fields、McKenzie Marshall、Qigan Cheng、Xin Cui、Lukasz Wojtas、X. Peter Zhang
DOI:10.1021/jacs.9b08894
日期:2019.11.13
azides can be effectively activated by the cobalt(II) complexes of D2-symmetric chiral amidoporphyrins for enantioselective radical 1,5-C-H amination to stereoselectively construct 5-membered cyclic sulfonamides. In addition to C-H bonds with varied electronic properties, the Co(II)-basedmetalloradical system features chemoselectiveamination of allylic C-H bonds and is compatible with heteroaryl groups
'Salen' along: The iridium(III)–salen complex 1 efficiently catalyzes the title reaction of 2‐ethylbenzenesulfonyl azides to give five‐membered sultams with high enantioselectivity. Other 2‐alkyl‐substitued substrates lead to five‐ and six‐membered sultams with high enantioselectivity; the regioselectivity depends upon the substrate and the catalyst used. EDG=electron‐donating group.