Synthesis, Biological Activity, and Conformational Analysis of Four <i>seco</i>-<scp>d</scp>-15,19-<i>bisnor</i>-1α,25-Dihydroxyvitamin D Analogues, Diastereomeric at C17 and C20
作者:Xiaoming Zhou、Gui-Dong Zhu、Dirk Van Haver、Maurits Vandewalle、Pierre J. De Clercq、Annemieke Verstuyf、Roger Bouillon
DOI:10.1021/jm980736v
日期:1999.9.1
The synthesis of four CD-ring-modified 19-nor-1alpha, 25-dihydroxyvitamin D(3) derivatives lacking C15, referred to as 6C analogues, and diastereomeric at C17 and C20 is described. The synthesis involves an Ireland-Claisen rearrangement of a 3-methyl-substituted ester of (1R)-3-methyl-2-cyclohexen-1-ol as the key step, followed by elaboration of the side chain, transformation into a C8 cyclohexanone
描述了四种CD环修饰的19-nor-1alpha,25-二羟基维生素D(3)缺乏C15的衍生物的合成,称为6C类似物,在C17和C20处为非对映体。合成过程涉及(1R)-3-甲基-2-环己烯-1-醇的3-甲基取代的酯的爱尔兰-克莱森重排,这是关键步骤,然后精制侧链,转化为C8环己酮衍生物,以及最终的Wittig-Horner与19-nor A环氧化膦的偶联。尽管拥有比母体激素更灵活的侧链,但生物学评估显示,该非对映异构体具有超乎预期的超激动性抗增殖和分化活性(比1alpha,25(OH)(2)D(3)高10-50倍)在C17和C20具有“自然”配置。其他非对映异构体的活性降低了25-90%。所有四个类似物都显示出降低的结合亲和力(45%或更低),其钙化活性比1alpha,25(OH)(2)D(3)低4-400倍。使用分子力学计算研究了其侧链的构象行为,并将结果表示为体积图。通过从最活跃的类