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.
SYNTHESIS AND [2+2]-CYCLOREVERSION OF CAGE KETONES
作者:Yoshiro Yamashita、Toshio Mukai
DOI:10.1246/cl.1984.1741
日期:1984.10.5
A series of pentacyclic cageketones 2b-d having no substituent was synthesized by the photochemical [2+2]-cycloaddition reaction of corresponding tricyclic dienones 1b-d. The cageketones 2b-d underwent thermal [2+2]-cycloreversion to give dienones 1b-d. The reactivities were dependent on the length of the bridge “X”.