Lipase-mediated kinetic resolution of tricyclic acyloins, endo-3-hydroxytricyclo[4.2.1.02,5]non-7-en-4-one and endo-3-hydroxytricyclo[4.2.2.02,5]dec-7-en-4-one
摘要:
Kinetic resolution of tricyclic acyloins, endo-3-hydroxytricyclo[4.2.1.0(2,5)]non-7-en-4-one and endo-3-hydroxytricyclo[4.2.2.0(2,5)]dec-7-en-4-one, and their acetates has been examined using a lipase. It has been found that a facile and stereoselective kinetic resolution occurs both in organic solvent and an aqueous solution in enantiocomplementary ways to afford both enantiomers of the acyloins and their acetates in enantiomerically pure forms. Enantiomerization of (+)-acyloins leading to (-)-acyloin acetates has also been achieved by the same lipase in an organic solvent by addition of a catalytic amount of triethylamine. (C) 1997 Elsevier Science Ltd.