3-(Dimethoxyphosphorylmethyl)cyclopent-2-enone was converted into (+/-)-prostaglandin B1 methyl ester in two steps involving regioselective alkylation at C(2) with methyl 7-iodoheptanoate and subsequent Horner-Wittig reaction with dimer of 2-hydroxyheptanal (42% overall yield). The use of (R)- and (S)-2-(tert-butyldimethylsilyloxy)heptanal for the Horner olefination reaction gave, after deprotection
在两个步骤中,将3-(二甲氧基
磷酰基甲基)环戊-2-烯酮转化为(+/-)-
前列腺素B1甲酯,该步骤涉及在C(2)用7-
碘庚
庚酸甲酯进行区域选择性烷基化,随后进行与2-二聚体的霍纳-维蒂希反应。羟基
庚醛(42%的总收率)。将(R)-和(S)-2-(叔丁基二甲基甲
硅烷氧基)
庚醛用于霍纳烯化反应,在羟基脱保护后,得到对映体纯形式的标题化合物,总产率为28%。