Chemoenzymatic synthesis of enantiomerically enriched α-chiral 3-oxy-propionaldehydes by lipase-catalyzed kinetic resolution and desymmetrization
作者:Daniel Wiktelius、Emma K. Larsson、Kristina Luthman
DOI:10.1016/j.tetasy.2006.06.045
日期:2006.8
and leucine aldehyde analogues have been prepared by lipase catalyzed desymmetrization or kinetic resolution of 1,3-propanediol derivatives as key steps. Observations of unusual enantioselectivity were made, and most notably, Candida antarctica lipase B showed an opposite enantiopreference from other lipases, which was exploited in the synthesis. A thorough evaluation of chemoenzymatic routes to both
对映体富集的苯丙氨酸和亮氨酸醛类似物已通过脂肪酶催化的1,3-丙二醇衍生物的脱对称化或动力学拆分制备为关键步骤。观察到不寻常的对映选择性,最显着的是,南极假丝酵母脂肪酶B显示出与其他脂肪酶相反的对映异构体,其在合成中得到了利用。对目标α-手性3-氧-丙醛的两种对映体的化学酶促途径进行全面评估,得出简单,廉价且有效的方法,从五个步骤开始,通过五个步骤即可提供高达92%对映体过量和55%总收率的产品可访问的起始材料。