Rosaprostol, an antiulcer drug, was prepared in five steps and in 36% overall yield starting from 3-(dimethoxyphosphorylmethyl)cyclopent-2-enone (6). The regioselective alkylation of 6 at C(2) with methyl 7-iodoheptanoate and subsequent Horner-Wittig reaction with pentanal constitute the key steps of this total synthesis.
从 3-(二甲氧基
磷酰甲基)环戊-2-烯酮(6)开始,通过五个步骤制备了抗溃疡药物罗沙前列醇,总收率为 36%。6 与 7-iodo heptanoate 甲酯在 C(2)处发生的区域选择性烷基化反应,以及随后与
戊醛发生的 Horner-Wittig 反应,构成了整个合成过程的关键步骤。