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)-based metalloradical system features chemoselective amination of allylic C-H bonds and is compatible with heteroaryl groups
芳基磺酰基和烷基磺酰基叠氮化物都可以被 D2 对称手性酰氨基卟啉的钴 (II) 配合物有效活化,用于对映选择性自由基 1,5-CH 胺化以立体选择性地构建 5 元环磺酰胺。除了具有不同电子特性的 CH 键外,基于 Co(II) 的金属自由基系统还具有烯丙基 CH 键的化学选择性胺化,并与杂芳基相容,以高产率和高对映选择性生产官能化的 5 元手性环磺酰胺。Co(II) 催化的 CH 胺化的独特反应性和选择性归因于其潜在的逐步自由基机制,这得到了几条实验证据的支持。