Reaction of 6-methoxy-2-(p- methoxyphenyl )-3,4-dihydronaphthalen-1(2H)- one (9) with dimethylketene ethyl trimethylsilyl
acetal (10) in the presence of titanium tetrachloride
gave ethyl 2-methyl-2-[6?-methoxy- 2?-(p- methoxyphenyl )-3?,4?-dihydronaphthalen-1?-yl] propanoate (11) which upon treatment with methanesulfonic acid afforded the lactone
(13). Reduction of (11) with lithium/ammonia yielded mainly 6-methoxy- 2-(p- methoxyphenyl )-1,2,3,4-tetrahydronaphthalene (16), but
hydrogenation of (11) over palladium/charcoal gave 61% of ethyl
(1?RS,2?RS)-2-methyl-2-[6?-methoxy-2?-(p- methoxyphenyl )-1?,2?,3?,4?-
(tetrahydronaphthalen-1?-yl] propanoate (21a). Alternatively, the ester (21a) was
prepared in three steps from the ketone (9) by
reaction of the derived 1ξ-acetoxy-6-methoxy-2ξ-(p- methoxyphenyl )-1,2,3,4- tetrahydronaphthalene
(20b) with the ketene silyl acetal
(10) in the presence of zinc iodide. Treatment of the ester (21a) with methanesulfonic acid afforded 72% of
2,8-dimethoxy-5,5-dimethyl-cis-4b, 10b,11,12-tetrahydrochrysen-6(5H)-one (22)
which was converted into
2,8-dimethoxy-5,5-dimethyl-cis-4b,5,6,10b,11,12-hexahydrochrysene (23) in 63%
yield via the dithiolan (24). Demethylation
of (23) gave 5,5- dimethyl-cis-4b,5,6,10b,11,12-hexahydrochrysene-2,8-diol (3a).
��� Assays of the oestrogenic
activity of compound (3a), and of related hydrochrysenediols
are reported.
在四氯化钛存在下,6-甲氧基-2-(对甲氧基苯基)-3,4-二氢萘-1(2H)-酮(9)与二甲基乙烯基乙基三甲基硅缩醛(10)反应
乙缩醛 (10) 在四氯化钛存在下进行反应
得到 2-甲基-2-[6?-甲氧基-2?-(对甲氧基苯基)-3?,4?-二氢萘-1?-基] 丙酸乙酯 (11),用甲磺酸处理后得到内酯 (13)。
(13).锂/氨还原 (11) 主要得到 6-甲氧基-2-(对甲氧基苯基)-1,2,3,4-四氢萘 (16),但
在钯/炭上氢化 (11),得到 61% 的乙基(1?RS,2?
(1?RS,2?RS)-2-methyl-2-[6?-methoxy-2?-(p- methoxyphenyl )-1?,2?,3?,4?-
(四氢萘-1?-基] 丙酸酯 (21a)。或者,酯 (21a)
酯 (21a)是由酮 (9) 通过以下三个步骤制备的
将衍生的 1ξ-乙酰氧基-6-甲氧基-2ξ-(对甲氧基苯基)-1,2,3,4-四氢萘 (20b) 与酮反应制备酯 (21a)。
(20b) 与烯酮硅基缩醛 (10) 的反应
(10) 在碘化锌存在下反应。用甲磺酸处理酯 (21a),可得到 72% 的
2,8-dimethoxy-5,5-dimethyl-cis-4b, 10b,11,12-tetrahydrochrysen-6(5H)-one (22)
转化为
2,8-二甲氧基-5,5-二甲基-顺式-4b,5,6,10b,11,12-六氢菊苣烯 (23),收率为 63%。
二硫环戊烷 (24)。 去甲基化
23)的脱甲基反应得到 5,5-二甲基-顺式-4b,5,6,10b,11,12-六氢菊烯-2,8-二醇(3a)。
雌激素活性测定
报告了化合物(3a)以及相关的氢链烯二醇的雌激素活性。
报道。