Abstract
A new strategy has been developed for the CAL-B catalysed kinetic resolution of tropic acid by which both enantiomers of tropic acid can be obtained in good enantiomeric excess. ( R)-Tropic acid was synthesised with 90% ee and ( S)-tropic acid butyl ester in 99% ee by the hydrolysis of tropic acid butyl ester. The other enantiomers were available through the enzymatically catalysed reaction of tropic acid lactone with butanol to give ( S)-tropic acid lactone and ( R)-tropic acid ester in >98% ee.
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