Total synthesis of natural (+)-spatol. Confirmation of the absolute stereostructure
作者:Masahide Tanaka、Kiyoshi Tomioka、Kenji Koga
DOI:10.1016/s0040-4020(01)81205-9
日期:1994.1
synthesis of optically pure spatol (+)-1 was achieved by employing asymmetric (2+2) photocycloaddition of the optically pure butenolide 12 with cyclopentenone ethyleneketal. The two major photocycloadducts 14, 15 were separately converted into the cis,anti,cis-tricyclo-[5.3.0.0.2,6]decane 9 and then to the sulfonium 11. Coupling of 11 through ylide with optically active epoxyaldehyde 24 provided optically