2-Ethyl and 2-Ethylidene Analogues of 1α,25-Dihydroxy-19-norvitamin D<sub>3</sub>: Synthesis, Conformational Analysis, Biological Activities, and Docking to the Modeled rVDR Ligand Binding Domain
作者:Rafal R. Sicinski、Piotr Rotkiewicz、Andrzej Kolinski、Wanda Sicinska、Jean M. Prahl、Connie M. Smith、Hector F. DeLuca
DOI:10.1021/jm020007m
日期:2002.8.1
Novel 19-nor analogues of 1alpha,25-dihydroxyvitamin D(3) were prepared and substituted at C-2 with an ethylidene group. The synthetic pathway was via Wittig-Horner coupling of the corresponding A-ring phosphine oxides with the protected 25-hydroxy Grundmann's ketones. Selective catalytic hydrogenation of 2-ethylidene analogues provided the 2alpha- and 2beta-ethyl compounds. The 2-ethylidene-19-nor
制备新型的19-nor类似物1alpha,25-dihydroxyvitamin D(3),并在C-2处被亚乙基取代。合成途径是通过相应的A环膦氧化物与受保护的25-羟基Grundmann酮的Wittig-Horner偶联进行的。2-亚乙基类似物的选择性催化氢化提供了2α-和2β-乙基化合物。与亚乙基部分具有甲基的2-亚乙基-19-nor化合物与C(6)-C(7)键(E-异构体)成反式关系,比相应的Z-异构体和天然化合物更有效激素与维生素D受体结合。(20S)-2-亚乙基-19-norvitamin D(3)的两个几何异构体(E和Z)和2α-乙基-19-norvitamins的两个几何异构体(在20R和20S系列中)均具有更高的HL-60区分度活性比1alpha,25-(OH)(2)D(3)大。2-亚乙基维生素的两种E-异构体(20R和20S)的特征是大鼠的钙化活性非常高。还报告了大鼠维生