Synthesis and structure–activity studies of 8α- and 9β-analogues of 14,17-ethanoestradiol
作者:James R. Bull、Pieter D. de Koning
DOI:10.1039/a908375h
日期:——
Synthetic routes to the title compounds are described, commencing with readily available 19-norsteroid precursors. The reaction of 3-methoxy-8α-estra-1,3,5(10),14,16-pentaen-17-yl acetate 3 with phenyl vinyl sulfone at 150 °C proceeded in high yield, but with poor selectivity, to give a mixture of 14α,17-cycloadducts, which underwent convergent functional group modification, to furnish 14α,17α-ethano-8α-estradiol 13. The feasibility of performing similar cycloaddition chemistry on analogous 9β-precursors was demonstrated, but the preferred synthetic route entailed configurational inversion at C-9, of 14α,17α-ethanoestradiol 25, via moderately stereoselective hydrogenation of a 9,11-dehydro intermediate, leading to 14α,17α-ethano-9β-estradiol 32. The estrogen receptor binding affinities of 13 and 32 are reported, and discussed in terms of superimpositional modelling on estradiol.
标题化合物的合成路线被描述,起始于易得的19-去甾激素前体。3-甲氧基-8α-雌甾-1,3,5(10),14,16-五烯-17-醋酸酯3与苯基乙烯磺酰在150°C下反应,得到了高产率但选择性较差的产物,形成了一种14α,17-环加成物的混合物,这些产物经过收敛的官能团修饰,最终得到14α,17α-乙烯基-8α-雌二醇13。进行了类似的环加成化学反应的可行性研究,使用类似的9β-前体,但首选的合成路线涉及对C-9进行构象反转,通过对9,11-脱氢中间体的中等立体选择性氢化,最终得到14α,17α-乙烯基-9β-雌二醇32。报道了13和32的雌激素受体结合亲和力,并在雌二醇的重叠建模基础上进行了讨论。