摘要:
Enantiomerically pure 4-oxo-2-cyclopentenyl derivatives were prepared by kinetic resolution with penicillin G acylase (EC 3.5.1.11) immobilized on an epoxy activated polymer. The enzyme selectively hydrolyzes the phenylacetyl ester of the (S)-enantiomer to give the (S)-alcohol. The enantioselectivity E increases from 12.4 in 0.05 M phosphate buffer, to E = 100-110 in acetonitrile-buffer (20% v/v) and E >200 in diisopropyl ether. The immobilized enzyme is stable and retains >90% of its activity after 10 recycles over one week at room temperature. (C) 2012 Elsevier Ltd. All rights reserved.