Photoredox-Catalyzed Alkene Amination: C(sp2)-H/N-H Radical-Radical Cross Dehydrogenative Coupling

Org Lett. 2024 Mar 22;26(11):2326-2331. doi: 10.1021/acs.orglett.4c00682. Epub 2024 Mar 7.

Abstract

Direct alkene C-H/N-H cross dehydrogenative coupling is an infrequent, highly challenging transformation. Herein, a photoredox radical-radical cross-coupling reaction between ketene dithioacetal as a persistent alkene radical cation and azole nitrogen center radical (NCR) was developed. This direct alkene amination proceeded through a synergistic photoredox and cobalt catalysis, with only H2 evolution. The reaction showed excellent tolerance and highly regio- and stereospecific manner, expanding the scope of C(sp2)-N construction methods and radical cross-coupling modes.