Syntheses of 22- and 23-hydroxylated bile alcohols.
作者:TAIJU KURAMOTO、NAOKO MATSUMOTO、TAKAHIKO HOSHITA
DOI:10.1248/cpb.26.2788
日期:——
The syntheses of four new bile alcohols, 5β-cholestane-3α, 7α, 12α, 22α-tetrol, 5β-cholestane-3α, 7α, 12α, 22β-tetrol, 5β-cholestane-3α, 7α, 12α, 23α-tetrol, and 5β-cholestane-3α, 7α, 12α, 23β-tetrol, were described. The 22-hydroxy compounds were prepared from bisnorcholyl aldehyde by the Grignard reaction with 3-methylbutylmagnesium chloride. The 23-hydroxy compounds were prepared from norcholic acid by the condensation with diisobutylcadmium and the subsequent lithium aluminum hydride reduction of the resulting 3α, 7α, 12α-trihydroxy-5β-cholestan-23-one. One of the synthetic tetrols, 5β-cholestane-3α, 7α, 12α, 23β-tetrol was identical with a bile alcohol isolated from a patient with cerebrotendinous xanthomatosis.
介绍了四种新胆汁醇的合成:5β-胆甾烷-3α、7α、12α、22α-四醇、5β-胆甾烷-3α、7α、12α、22β-四醇、5β-胆甾烷-3α、7α、12α、23α-四醇和 5β-胆甾烷-3α、7α、12α、23β-四醇。22- 羟基化合物是由双正胆醛与 3-甲基丁基
氯化镁通过格氏反应制备的。23- 羟基化合物是以
去甲胆酸为原料,通过与
二异丁基镉缩合,然后用
氢化铝锂还原生成 3α,7α,12α-三羟基-5β-胆甾烷-23-酮制备的。其中一种合成四醇,即 5β-胆甾烷-3α,7α,12α,23β-四醇,与一种从脑黄疽患者体内分离出的胆汁醇相同。