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。