% ee. In explanation of these high enantioselectivities of RDL, the simple box-type active site model of enzyme was tentatively proposed. On the other hand, PFL-catalysed transesterification of meso-bis-(hydroxymethyl) cyclopentane (6) afforded (+)-16 of >99 % ee. The obtained (+) and (−)-16 were converted into the natural carbocyclic nucleoside (−)-aristeromycin (25), respectively.
德氏根霉的
脂肪酶(RDL)的
水解-催化的内消旋-1,3-二(乙酰氧基甲基)
环戊烷衍
生物(7,12)和荧光假单胞菌
脂肪酶(PFL)的
水解-催化7个,得到手性单
乙酸酯(15,16)的> 99%ee。为了解释RDL的高对映选择性,尝试性地提出了简单的盒型酶活性位点模型。另一方面,PFL催化的内消旋-双-(羟甲基)
环戊烷(6)酯交换反应得到的(+)- 16 ee> 99%。将获得的(+)和(-)- 16转化为天然碳环核苷(-)-
阿霉素(25)。