(+/-)-Yuehchukene (YCK) is a novel bis-indole alkaloid with potent anti-implantation activity in rats. The present paper reports the activity of YCK derivatives by substitution on the parent compound. Substitutions on the indole nitrogens or on 2- and 5'- positions of the indole moiety abolished activity. N-1'-methylation of the free indole only permitted a 30% residual activity. Saturation of the C-9-C-10 cyclohexenyl double bond did not affect activity at all. Hydroxylation, whether on the C-9-C-10 double bond, or at C2 or C5, rendered the hydroxylated derivatives inactive. This suggests that the active metabolite in anti-implantation was probably not a hydroxylated derivative carrying estrogenic activity.
(±)-Yuehchukene (YCK) 是一种具有强效抗着床活性的新型双
吲哚生物碱。本文报告了YCK衍
生物通过在母体化合物上进行的取代反应的活性。在
吲哚的氮原子或
吲哚基团的2-位和5'-位进行取代反应会使活性消失。仅对游离
吲哚进行N-1'-甲基化处理,活性仅保持30%。饱和C-9-C-10
环己烯基双键对活性没有任何影响。无论是对C-9-C-10双键、还是在C2或C5处进行羟基化处理,所得的羟基化衍
生物均失去活性。这表明在抗着床活性的代谢产物中,很可能并非是具有
雌激素活性的羟基化衍
生物。