In order to protect selectively the double bond of the allyl group at C-13 in 3-methoxy-13-allyl-8, 14-secogona-1, 3, 5 (10), 9-tetraene-14, 17-dione (I), the authors established the synthesizing route via 9α, 14α-epoxy-3-methoxy-13β-allyl-8, 14-secogona-1, 3, 5 (10)-trien-17-one (IV), which was converted into the diol (VI) or the dibromide (XXVI). Reaction of VI with acetic anhydride and p-toluenesulfonic acid gave the gonapentaene triacetate (X), but treatment of VI with hydrochloric acid in methanol yielded a novel steroid (VIII).
为了选择性保护3-甲氧基-13-烯丙基-8,14-secogona-1,3,5(10),9-四烯-14,17-二酮(I)中C-13的烯丙基双键,作者确定了通过9α,14α-环氧-3-甲氧基-13β-烯丙基-8,14-secogona-1,3,5(10)-
三烯-17-酮(IV)的合成路线,该化合物可转化为二醇(VI)或二
溴化物(XXVI)。VI与
乙酸酐和
对甲苯磺酸的反应产生了
三乙酸庚烯酯(X),但用
甲醇中的
盐酸处理VI则产生了一种新型的甾体(VIII)。