Improved Synthesis and Molecular Modeling of 4.BETA.,19-Dihydroxyandrost-5-en-17-one, an Excellent Inhibitor of Aromatase.
作者:Mitsuteru Numazawa、Keiko Yamada、Yoko Watari、Momoko Ando
DOI:10.1248/cpb.50.703
日期:——
4β,19-Dihydroxyandrost-5-en-17-one (6) is an excellent competitive inhibitor of estrogen synthetase (aromatase). Alternate, improved synthesis of this inhibitor was established. Treatment of 19-(tert-butyldimethylsilyloxy)androst-4-en-17-one (8) with m-chloroperbenzoic acid gave a 1.4 : 1 mixture of 4α,5α-epoxide 9 and its 4β,5β-isomer 10. The mixture was reacted with dil. HClO4 in dioxane to produce principally 4β,5α-diol 11 (80%) of which acetylation followed by dehydration with SOCl2 yielded 4β,19-diacetoxy-5-ene compound 14 in good yield. Alkaline hydrolysis of diacetate 14 gave 4β,19-diol 6. The minimum energy conformation of the powerfull aromatase inhibitor 6 was obtained with the PM3 method and compared with that of the structurally related diol steroid, 4-ene-5β,19-diol 3, a weak competitive inhibitor.
4β,19-二羟基雄甾-5-烯-17-酮(6)是雌激素合成酶(芳香酶)的一种极好的竞争性抑制剂。已建立这种抑制剂的替代改进合成方法。用间氯过氧苯甲酸处理19-(叔丁基二甲基硅氧基)雄甾-4-烯-17-酮(8)得到1.4 : 1的4α,5α-环氧化物9及其4β,5β-异构体10的混合物。将混合物与二氧六环中的稀HClO4反应,主要生成4β,5α-二醇11(80%),对其乙酰化,然后用SOCl2脱水,得到4β,19-二乙酰氧基-5-烯化合物14,收率较高。对二乙酸酯14进行碱性水解,得到4β,19-二醇6。用PM3方法得到强效芳香酶抑制剂6的最小能量构象,并将其与结构相关的二醇类固醇4-烯-5β,19-二醇3(一种弱竞争性抑制剂)的构象进行比较。