Palladium-catalyzed reaction of TBS ether of 4-cyclopentene-1,3-diol monoacetate (>95% ee) with an anion derived from methyl malonate and a base such as t-BuOK and LDA proceeded highly efficiently and reproducibly. The product obtained in >90% isolated yield was transformed in five steps into the key cyclopentenone possessing the α-chain at the γ position. Aldol reaction of this enone with the ω-chain aldehyde afforded
4-
环戊烯-1,3
-二醇单
乙酸酯(> 95%ee)的TBS醚与衍生自
丙二酸甲酯的阴离子和t- BuOK和
LDA等碱的
钯催化反应进行得非常高效且可重复。以> 90%的分离产率获得的产物经五步转化为在γ位具有α链的关键
环戊烯酮。该烯酮与ω-链醛的醛醇缩合反应得到醛醇加合物,并且将衍生的
甲磺酸酯暴露于Al 2 O 3提供了完整结构的交联二烯酮。最后,官能团操作布置Δ 12 -
PGJ 2有效。同样,15-脱氧Δ 12,14 -
PGJ 2合成了5,6-
乙炔类似物和5,6-二氢类似物。