A copper-catalyzed B–H bond insertion reaction of azide–ynamide with borane adducts via α-imino copper carbenes

A new copper-catalyzed B–H bond insertion reaction between azide–ynamides and borane adducts has been developed, which represents the first B–H bond insertion into α-imino metal carbenes. This protocol enables the facile and practical synthesis of valuable organoborons in moderate to good yields with wide substrate scope and good functional group tolerance.