| 摘要 |
A process for the preparation of alpha -carboxy, 6, alpha -methoxy penicillin derivatives by the enzymatic hydrolysis of an esterified derivative. The process is for the preparation of a compound of formula (I): <IMAGE> (I) wherein R represents phenyl or 2- or 3-thienyl, which process comprises subjecting a compound of formula (IV): <IMAGE> (IV) where R1 is an aryl radical, to the action of an enzyme selected from bromelain, papain, gelatase, trypsin, pancreatin or an esterase-producing strain of Escherichia coli, Pseudomonas aeruginosa, Aspergillus niger or Saccharomyces sp. |
