An improved procedure for the lipase-catalysed kinetic resolution of endo-endo-cis-bicyclo[3.3.0]octane-2,6-diol—synthesis of potential C2-symmetric enantiomerically pure bidentate auxiliaries
摘要:
An improved procedure for the kinetic resolution of endo-endo-cis-bicyclo[3.3.0]octane-2,6-diol rac-1 by transesterification with vinyl acetate catalysed by lipase from Pseudomonas cepacia in an organic solvent which yields both enantiomers with an enantiomeric excess of > 95% is described. The configuration at both stereogenic centres bearing hydroxy groups has been inverted by treatment of the corresponding mesylates with caesium acetate in the presence of 18-crown-6 to afford, after deacetylation, the corresponding enantiomerically pure diastereoisomeric exo-exo-cis-diols. (C) 1997 Elsevier Science Ltd.
An improved procedure for the lipase-catalysed kinetic resolution of endo-endo-cis-bicyclo[3.3.0]octane-2,6-diol—synthesis of potential C2-symmetric enantiomerically pure bidentate auxiliaries
摘要:
An improved procedure for the kinetic resolution of endo-endo-cis-bicyclo[3.3.0]octane-2,6-diol rac-1 by transesterification with vinyl acetate catalysed by lipase from Pseudomonas cepacia in an organic solvent which yields both enantiomers with an enantiomeric excess of > 95% is described. The configuration at both stereogenic centres bearing hydroxy groups has been inverted by treatment of the corresponding mesylates with caesium acetate in the presence of 18-crown-6 to afford, after deacetylation, the corresponding enantiomerically pure diastereoisomeric exo-exo-cis-diols. (C) 1997 Elsevier Science Ltd.