作者:JUNICHI GOTO、KENICHI SUDO、TOSHIO NAMBARA
DOI:10.1248/cpb.22.1140
日期:——
In order to examine the physiological activity the preparation of 3, 17-dihydroxy-19-nor-13α-pregna-1, 3, 5 (10)-trien-20-one 17-acetates (IIId, IXc) has been undertaken. The Grignard reaction of 13α-estrone (I) with ethynylmagnesium bromide provided two epimeric 17-ethynyl-17-ols (II, VIIIa), which on hydration were led to 3, 17-dihydroxy-19-nor-13α-pregnatrien-20-ones (IIIa, IXa). Elucidation of the stereochemistry at C-17 was attained by the degradative means. First, IIIa was submitted to metal hydride reduction, usual acetylation followed by Serini reaction to afford 19-nor-13α-pregnatrien-20-one (V). Upon treatment with base V was readily transformed into the thermody-namically much more stable 17α-epimer (VIb), whose structure was confirmed by leading to the known 13α-estratriene-3, 17α-diol (VIIa) employing Baeyer-Villiger reaction. The desired compounds were unequivocally obtained from the 3, 17-diacetates (IIIc, IXb) by partial hydrolysis, respectively.
为了研究生理活性,进行了3, 17-二羟基-19-去甲基-13α-孕-1, 3, 5 (10)-三烯-20-酮 17-乙酸酯(IIId, IXc)的制备。13α-雌酮(I)与乙炔镁溴化物的格氏反应生成了两种表异构体17-乙炔基-17-醇(II, VIIIa),经过水合反应转化为3, 17-二羟基-19-去甲基-13α-孕三烯-20-酮(IIIa, IXa)。通过降解的方法阐明了C-17的立体化学。首先,对IIIa进行金属氢化物还原,随后进行常规的乙酰化和Serini反应,得到19-去甲基-13α-孕三烯-20-酮(V)。在碱的处理下,V迅速转化为热力学上更加稳定的17α-表异构体(VIb),其结构通过Baeyer-Villiger反应生成已知的13α-雌三烯-3, 17α-二醇(VIIa)得到确认。所需化合物通过部分水解3, 17-二乙酸酯(IIIc, IXb)明确获得。