Syntheses of isocarbacyclin (20) using highly regioselective alkylation of the new allylicalcohol intermediate 6 having an exocyclic double bond are described. The allylicalcohol 6 was prepared by (i) allylic rearrangement of the allylicalcohol 3 having an endocyclic double bond and (ii) reductive cyclization of γ-ethynyl aldehyde 11a which was synthesized from (R)-4-hydroxy-2- cyclopentenone derivative
Isocarbacyclin [(+)-9(O)-methano-Δ6(9α)-prostaglandin I1] (2) was synthesized from bicyclic synthons such as 2-phosphorylated, 2-(thio)phosphorylated, 2-tosylated, 2-methoxycarbonylated, and 2-chloro-3-methylenebicyclo[3.3,0]octanes via highly regioselective SN2′ alkylation with zinc-copper reagents 9 in excellent yields.
异卡巴环素[(+)-9(O)-亚甲基-Δ6 (9α)-前列腺素I 1 ](2)由双环合成子合成,例如2-磷酸化,2-(硫代)磷酸化,2-甲苯磺酸化,2-通过高区域选择性S N 2'烷基化与锌-铜试剂9进行甲氧基羰基化和2-氯-3-亚甲基双环[3.3,0]辛烷的合成,收率极高。