Chemoenzymatic Synthesis of Antiviral Carbocyclic Nucleosides: Asymmetric Hydrolysis of <i>meso</i>-3,5-Bis(acetoxymethyl)cyclopentenes Using <i>Rhizopus </i><i>delemar</i> Lipase
作者:Masakazu Tanaka、Yoshihiko Norimine、Toshiaki Fujita、Hiroshi Suemune、Kiyoshi Sakai
DOI:10.1021/jo9608230
日期:1996.1.1
norbornadienes were stereoselectively converted into the meso-3,5-bis(acetoxymethyl)cyclopentenes by a three-step sequence of ozonolysis, reduction, and acetylation. Rhizopus delemar lipase (RDL)-catalyzed asymmetric hydrolysis of meso-3,5-bis(acetoxymethyl)cyclopentenes afforded the monoalcohols of high enantiomeric purities (>95% ee) in good yields (64-95%). The obtained monoalcohols 11 and 14 could be
通过三步的臭氧分解,还原和乙酰化反应,将7位取代的降冰片二烯立体选择性地转化为内消旋3,5-双(乙酰氧基甲基)环戊烯。根瘤菌脂肪酶(RDL)催化的内消旋3,5-双(乙酰氧基甲基)环戊烯不对称水解可提供高对映体纯度(> 95%ee)的一元醇,收率良好(64-95%)。所得一元醇11和14可用于合成抗病毒碳环核苷(-)-carbovir和(-)-BCA。