AbstractThe first enzyme-catalyzed kinetic resolution of tert-butyl-3-hydroxy-4-phenylpyrrolidine-1-carboxylate is presented. Enzyme, solvent and temperature optimization resulted in a new resolution method with E = 40 enantioselectivity. The acetate derivative of the (+)-(3S,4R) enantiomer formed while the (−)-(3R,4S) isomer remained intact. Very good enantioselectivities (E > 200) were achieved in the enzyme-catalyzed alcoholysis of the racemic acetate in i-propanol and t-butanol where the (+)-(3S,4R) enantiomer was prepared in pure form (ee > 99.7%). Absolute configuration of the (−)-(3R,4S)-enantiomer was determined by single crystal X-ray diffraction method.
摘要:本文介绍了第一个以酶催化的动力学分辨法对叔丁基-3-羟基-4-苯基吡咯烷-1-羧酸酯进行的研究。通过对酶、溶剂和温度的优化,得到了一种新的分辨方法,其对映选择性为 E = 40。在醋酸酯衍生物中,形成了(+)-(3S,4R)对映体,而(-)-(3R,4S)异构体保持不变。在酶催化的醇解反应中,使用异丙醇和叔丁醇,获得了非常好的对映选择性(E > 200),其中(+)-(3S,4R)对映体以纯形式制备(ee > 99.7%)。通过单晶X射线衍射方法确定了(-)-(3R,4S)-对映体的绝对构型。