Catalytic radical difluoromethoxylation of arenes and heteroarenes.

ABSTRACT: Intermolecular C-H difluoromethoxylation of (hetero)arenes remains a long-standing and unsolved problem in organic synthesis. Herein, we report the first catalytic protocol employing a redox-active difluoromethoxylating reagent 1a and photoredox catalysts for the direct C-H difluoromethoxylation of (hetero)arenes. Our approach is operationally simple, proceeds at room temperature, and uses bench-stable reagents. Its synthetic utility is highlighted by mild reaction conditions that tolerate a wide variety of functional groups and biorelevant molecules. Experimental and computational studies suggest single electron transfer (SET) from excited photoredox catalysts to 1a forming a neutral radical intermediate that liberates the OCF₂H radical exclusively. Addition of th

SUBMITTER: Lee JW 

PROVIDER: S-EPMC6429774 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature