Enzymatic resolution of norbor(NE)nylmethanols in organic media and an application to the synthesis of (+)- and (−)-endo-Norbornene lactone.
摘要:
The enzymatic resolution of some norbornene carboxylic acids, norbornenylmethanols and -methylamines was evaluated. The kinetic resolution of norbornyl- and norbornenylmethanols by Porcine Pancreatic Lipase (PPL)-catalyzed transesterification in methyl acetate as the solvent leads to corresponding acetates and remaining methanols both of high enantiomeric purity. A useful application is the synthesis of both enantiomers of endo-norbornene lactone 8n via transesterification of iodolactone 18. The influence of structural variations on the efficiency of the PPL-catalyzed resolution of lactone methanols 21, 23, 25 and 28, at the optimal reaction conditions established for iodolactone 18, was investigated.
Enzymatic resolution of norbor(NE)nylmethanols in organic media and an application to the synthesis of (+)- and (−)-endo-Norbornene lactone.
摘要:
The enzymatic resolution of some norbornene carboxylic acids, norbornenylmethanols and -methylamines was evaluated. The kinetic resolution of norbornyl- and norbornenylmethanols by Porcine Pancreatic Lipase (PPL)-catalyzed transesterification in methyl acetate as the solvent leads to corresponding acetates and remaining methanols both of high enantiomeric purity. A useful application is the synthesis of both enantiomers of endo-norbornene lactone 8n via transesterification of iodolactone 18. The influence of structural variations on the efficiency of the PPL-catalyzed resolution of lactone methanols 21, 23, 25 and 28, at the optimal reaction conditions established for iodolactone 18, was investigated.
Enzyme mediated optical resolution of endo-norbornene lactone
作者:A.J.M. Janssen、A.J.H. Klunder、B. Zwanenburg
DOI:10.1016/s0040-4039(00)97284-8
日期:1990.1
The enzymaticresolution of some norbornene esters, -carboxylic acids and -methanols was evaluated. Good results were obtained for the Porcine Pancreatic Lipase (PPL) catalyzed transesterification of norbornene methanols 12 and 13 in methyl acetate. A formal kinetic resolution of endo-norbornene lactone 7 could be achieved through the PPL-catalyzed transesterification of iodolactone 15 in methyl acetate
Enzymatic preparation of optically active bicyclo[2.2.1]heptene derivatives, building blocks for terpenoid natural products. An attractive alternative to enantioselective Diels–Alder syntheses
作者:J. Van der Eycken、M. Vandewalle、G. Heinemann、K. Laumen、M. P. Schneider、J. Kredel、J. Sauer
DOI:10.1039/c39890000306
日期:——
Bicyclo[2.2.1]heptenederivatives (1)–(3), buildingblocks for terpenoidnaturalproducts, have been prepared with high enantiometric purities by enzymatic hydrolysis of their racemic esters in the presence of porcine liver esterase (PLE) and an ester hydrolase from Pseudomonas sp. (SAM-II).