Four epimeric 17-hydroxy-16-ethylestr-4-en-3-ones (11) having potent antiandrogenic activity were prepared stereoselectively starting from 16α-ethyl-16β, 17β-diol monoacetate (2). The nuclear magnetic resonance spectra of the four epimers and other 16-substituted estranes and androstanes were investigated in order to elucidate the possibility for the assignment of the unknown configurations at the positions of 16 and 17. The data of the coupling constants (J16, 17) and the chemical shifts (13-methyl protons and 17-proton) can be used for the determination of the configuration at the positions of 16 and 17.
从 16α-乙基-16β, 17β
-二醇单
乙酸酯 (2) 开始,立体选择性地制备了四种具有有效抗雄激素活性的差向异构 17-羟基-16-乙基酯-4-en-3-酮 (11)。研究了四种差向异构体和其他 16 取代雌烷和雄烷的核磁共振谱,以阐明 16 和 17 位未知构型分配的可能性。耦合常数数据 (J16, 17 )和
化学位移(13-甲基质子和17-质子)可用于确定16和17位的构型。