β-Chlorolactic acid was condensed with toluene-α-thiol to give 2-hydroxy-3-benzylthiopropanoic acid. The optical isomers were prepared by resolution with brucine and quinine. Removal of benzyl groups yielded (+)- and (–)-2-hydroxy-3-mercaptopropanoic acid. Desulphurization with Raney nickel gave (+)- and (–)-lactic acid. Configuration and optical purity of all isomers have been determined.
将
β-氯乳酸与
甲苯-α-
硫醇缩合,得到2-羟基-3-苄基
硫代
丙酸。旋光异构体是通过苯丙
氨酸和
奎宁拆分而制备的。除去苄基得到(+)-和(-)-2-羟基-
3-巯基丙酸。用阮内
镍脱
硫得到(+)-和(-)-
乳酸。已经确定了所有异构体的构型和光学纯度。