Catalytic asymmetrization of meso-3,7-bis-siloxycycloheptene by chiral rhodium(I)-binap [2,2′-bis(diphenylphosphino)-1,1′-binaphthyl] catalyst: the enantiocontrolled asymmetric synthesis of (–)-(S)-physoperuvine

Abstract

Catalytic asymmetrization of meso-3,7-bis-tert-butyldimethylsiloxycycloheptene occurs in the presence of a chiral rhodium(I) binap catalyst to give optically active 4-tert-butyldimethylsiloxycycloheptanone in 70% ee after hydrolytic workup, the (R)-enantiomer of which has been transformed into (-)–(S)-physoperuvine, the major alkaloid of Physalis peruviana.