PhI(OAc)2/I2‐Mediated Decarboxylative C4‐Amination of Coumarin‐3‐Carboxylic Acids via Csp2−H Dehydrogenative C−N Cross‐Coupling under Ambient Conditions

Abstract

AbstractAn efficient and straightforward protocol for accessing a new series of functionalized 4‐aminocoumarins from PIDA/I2‐mediated decarboxylative C4‐amination of coumarin‐3‐carboxylic acids via direct Csp2−H dehydrogenative C−N cross‐coupling with secondary amines under ambient conditions has been accomplished. The notable advantages of this protocol are the tolerance of diverse functional groups, mild reaction conditions at ambient temperature, moderate to good yields, short reaction times (in minutes), high regioselectivity, gram‐scale applicability, and eco‐friendliness. This is the first report of decarboxylative Csp2−H cross‐dehydrogenative C−N coupling of coumarin‐3‐carboxylic acids for synthesizing 4‐aminocoumarins.