2-Aryl-2-[1-(2-hydroxypropyl)]-1,3-dithianes as Versatile Building Blocks for the Preparation of Enantiomerically Pure Drugs
作者:Franz Bracher、Thomas Litz
DOI:10.1002/ardp.19953280306
日期:——
An efficient access to chiral, non racemic arylbutanols 1a–c (ee>98%) as drug intermediates is described. Thioacetalization of substituted benzaldehydes 3a–c with 1,3‐propanedithiol gave 2‐aryl‐1,3‐dithianes 4a–c. Lithiation of 4a–c followed by reaction with racemic, (R)‐ or (S)‐propylene oxide, respectively, gave racemic, (R)‐ or (S)‐hydroxyalkyldithianes 5a–c in high yields. Subsequent desulfurization
描述了一种有效获取手性非外消旋芳基丁醇 1a - c (ee> 98%) 作为药物中间体的方法。取代的苯甲醛 3a-c 与 1,3-丙二硫醇的硫缩醛化得到 2-芳基-1,3-二噻烷 4a-c。4a - c 锂化,然后分别与外消旋的 (R) - 或 (S) - 环氧丙烷反应,以高产率得到外消旋的 (R) - 或 (S) - 羟烷基二噻烷 5a - c。随后用三丁基氢化锡 (TBTH) 进行脱硫导致芳基丁醇 1a – c 的几乎定量形成。酮醇6通过羟烷基二噻烷5a的水解获得。