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Journal of the American Chemical Society, Vol.134, No.8, 3615-3618, 2012
Pd(II)/Bronsted Acid Catalyzed Enantioselective Allylic C-H Activation for the Synthesis of Spirocyclic Rings
A Pd(II)/Bronsted acid catalyzed migratory ring expansion for the synthesis of indene derivatives possessing a stereogenic spirocyclic carbon center was developed. This transformation is believed to mechanistically proceed via enantioselective allylic C-H activation with concomitant semipinacol ring expansion to the nascent pi-allylpalladium species. Enantioselectivities as high as 98% ee were attainable.