We report two different chemoenzymatic enantioselective syntheses of baclofen based on the distinction between enantiotopic ester groups in compounds bearing a prochiral centre. In the first approach, the key step is the highly stereoselective enzymatic hydrolysis of dimethyl 3-(4-chlorophenyl)glutarate by chymotrypsin in an aqueous medium. In the second approach, the key step is the enzyme-catalyzed esterification of 2-(4-chloropheny 1)-1,3-propanediol by acetic anhydride in the presence of a lipase in an organic medium.
我们报告了基于含有一个非手性中心的化合物中对映异构酯基团之间的区别,实现巴氯芬的两种不同的化学酶选择性合成方法。在第一种方法中,关键步骤是在水介质中由胰蛋白酶高度立体选择性地水解二甲基3-(4-氯苯基)戊二酸酯。在第二种方法中,关键步骤是在有机介质中,通过酶催化的方式,乙酸酐存在下,利用脂肪酶对2-(4-氯苯基)-1,3-丙二醇进行酯化。