Stereoselective synthesis and structural establishment of (25S)-24,24-difluoro-1α,25,26-trihydroxyvitamin D3, a major metabolite of 24,24-difluoro-1α,25-dihydroxyvitamin D3
作者:Hiroshi Iwasaki、Ryuzo Hosotani、Yoichi Miyamoto、Yoshio Nakano、Keiko Yamamoto、Sachiko Yamada、Toshimasa Shinki、Tatsuo Suda、Kentaro Yamaguchi、Katsuhiro Konno、Hiroaki Takayama
DOI:10.1016/s0040-4020(98)00949-1
日期:1998.12
(25S)-24,24-Difluoro-1 alpha,25,26-trihydroxyvitamin D-3 (3a) and its (25R)-epimer (3b), either of which is expected to be a major metabolite of 24,24-difluoro-1 alpha,25-dihydroxyvitamin D-3 (2), were synthesized. Asymmetric addition to beta-ketosulfoxides (5a, 5b) of trimethylaluminum was used as a key process to construct the chiral tertiary alcohol moiety of 3a and 3b. The absolute configuration of the tertiary alcohol was determined by X-ray crystallographic analysis of 20 which is a CD-ring analog of the 3a intermediate. The configuration at the C(25) position of the metabolite was established as S by HPLC comparison between the metabolite and chemically synthesized 3a and 3b. (C) 1998 Elsevier Science Ltd. All rights reserved.
(25S)-24,24-二氟-1α,25,26-三羟基维生素D-3 (3a)及其(25R)-对映体(3b)被合成,其中任何一种预计成为24,24-二氟-1α,25-二羟基维生素D-3 (2)的主要代谢物。三甲基铝对β-酮砜(5a,5b)的不对称加成被用作构建3a和3b的三元醇手性基团的关键步骤。三元醇的绝对构型通过X射线晶体衍射分析确定,使用20作为3a中间体的CD环类似物。代谢物在C(25)位置的构型通过HPLC比较代谢物与化学合成的3a和3b确定为S。版权1998 Elsevier Science Ltd.保留所有权利。