Bacillus stearothermophilus alcohol dehydrogenase: A new catalyst to obtain enantiomerically pure bicyclic octen- and hepten-ols and -ones.
作者:Pier Paolo Giovannini、Stefania Hanau、Mario Rippa、Olga Bortolini、Marco Fogagnolo、Alessandro Medici
DOI:10.1016/0040-4020(95)00995-7
日期:1996.1
From the cells of Bacillusstearothermophilus a new enzyme has been isolated which catalyses the stereospecific redox reactions of bicyclicocten- and hepten- ols and -ones,
stereocontrolled strategy toward the total synthesis of isoprostanes based on a bicyclic alpha,beta-epoxy ketone intermediate 6. Bicyclo[3.3.0]octene scaffold permitted stereodirection of reagents allowing stereoselective epoxidation, diastereoselective ketone reduction, and regioselective epoxide opening otherwise not accessible with a simple cyclopentene framework.
A practical and economical resolution of endo-bicyclo[3.3.0]oct-7-en-2-ol and endo-bicyclo[3.3.0]oct-6-en-2-ol was accomplished via lipase-catalyzed enantioselective irreversible transesterification with vinyl acetate.
tested in the microbial reduction of methyl-substituted bicyclo[3.2.0]hept-3-en-6-ones 1a-c. The endo-alcohols 2a-c were obtained with good yields and enantiomeric excess. Lower yields are described for the exo-alcohols 3a-c which are normally enantiomerically pure. Comparisons with microbial reduction of bicyclo[3.2.0]hept-2-en-6-one 1d and bicyclo[3.3.0]oct-7-en-2-one 1e are also reported.
Enantiomers of endo-bicyclo[3.3.0]oct-7-en-2-ol have been resolved by an efficient and practical procedure based on the utilisation of (2S)- and (2R)-1-(4-toluenesulphonyl)pyrrolidine-2-carboxylic acid chlorides [(2S)-NTP-Cl and (2R)-NTP-Cl], easily available from, respectively, (2S)- and (2R)-proline, as resolving agents.