A phosphine-promoted intermolecular annulation reaction of functionalized 3-benzoyl
coumarin with alkynone has been disclosed. This reaction was found to be highly dependent
on the nucleophilicity of the phosphine. Two classes of coumarin-fused cyclopentanones
were selectively afforded in moderate to good yields with excellent diastereoselectivities
under the mild reaction conditions.
Key words
diversity-oriented - cyclopentanone - phosphine - annulation