Reverse Stereoselectivity in the Lipase-Catalyzed Hydrolysis of Diacetylated Pyrimidine Acyclonucleosides
作者:Renata Kołodziejska、Renata Studzińska
DOI:10.1002/cctc.201600931
日期:2016.12.7
prochiral acetyl groups of pyrimidine acyclonucleoside derivatives was catalyzed effectively by lipase Amano PS from Burkholderia cepacia (BCL) to give monoacetates with a high optical purity. The stereopreference of BCL depends on the structure of the substrates. The BCL‐catalyzed hydrolysis of the unsubstituted acyclonucleoside 2‐[2,4‐dioxo‐3,4,5,6,7,8‐hexahydroquinazolin‐1(2H)‐yl]methoxy}propane‐1,3‐diyl
嘧啶无环核苷衍生物的前手性乙酰基的酶促水解反应由洋葱伯克霍尔德氏菌(BCL)的脂肪酶Amano PS有效催化,可得到具有高旋光纯度的单乙酸酯。BCL的立体偏好取决于底物的结构。BCL催化的未取代无环核苷2-[2,4-二氧代-3,4,5,6,7,8-六氢喹唑啉-1(2 H)-基]甲氧基}丙烷} 1,3-二基的水解双乙酸盐具有对映体选择性(pro R)。反应后,对映体纯2- S获得异构体。与未取代的化合物相比,环上的另一个基团引起了酶催化的脱酰反应的立体选择性的显着变化,并且观察到了相反的手性偏好。2,4-二氧代-3,4,5,6,7,8-六氢喹唑啉环中C-6和C-8取代的无环核苷类似物的前手性酯基的酶促脱酰基作用导致2 R异构体(pro- S选择性)。