A convenient chemoenzymatic enantioconvergent access to enantiomerically pure (+)- or (-)-4-hydroxy-3-methyl-2-cyclohexenone is described using a one-pot two-step kinetic resolution-stereoinversion protocol followed by hydrolysis. The key step of the sequence is the spontaneous elimination of an undesired stereocenter. The choice between enzymatic acyl transfer or ester alcoholysis of the corresponding racemic starting material, together with the selectivity of a lipase, determines the absolute configuration of the desired single enantiomer.
本研究介绍了一种方便的
化学酶法对映体转化方法,即通过
水解后的单锅两步动力学解析-立体转化方案,获得对映体纯度为(+)-或(-)-
4-羟基-3-甲基-2-
环己烯酮。该过程的关键步骤是自发消除一个不需要的立体中心。相应外消旋起始原料的酶酰基转移或酯醇解选择,加上
脂肪酶的选择性,决定了所需单一对映体的绝对构型。