Cobalt‐Catalyzed Twofold Direct C(sp2)−C(sp3) Bond Coupling: Regioselective C‐3 Alkylation of Coumarins with (Cyclo)alkyl Ethers

Abstract A cobalt‐catalyzed regioselective C‐3 alkylation of coumarins was realized under mild reaction conditions, during which a variety of substituted coumarins including those containing sensitive functional groups could smoothly undergo the selective C( sp 2 )−C( sp 3 ) bond formation with a series of cyclic or straight‐chain alkyl ethers. magnified image