Kinetic Resolutions and Enantioselective Transformations of 5-(Acyloxy)pyrrolinones Using Candida antarctica Lipase B: Synthetic and Structural Aspects
摘要:
Various 5-(acyloxy)pyrrolinones have been prepared in enantiomerically pure form by means of an enzymatic resolution or an asymmetric transformation. Either enantiomer is obtained using the same enzyme, Candida antarctica lipase B, by modification of the procedure from transesterification to esterification. N-Acyl-5-(acyloxy)pyrrolinones 1 (R-2 = acyl) are synthesized by applying this method with 100% yield and >99% ee. To rationalize the observed enantioselectivity and the substituent effects of these reactions both empirical models and molecular modeling studies have been used, and a qualitative agreement was found between the results from these studies and the experimental results.
Lipase-Catalyzed Second-Order Asymmetric Transformations as Resolution and Synthesis Strategies for Chiral 5-(Acyloxy)-2(5<i>H</i>)-furanone and Pyrrolinone Synthons
作者:Hanneke van der Deen、Agnes D. Cuiper、Robert P. Hof、Arjan van Oeveren、Ben L. Feringa、Richard M. Kellogg
DOI:10.1021/ja953812h
日期:1996.4.24
By use of lipase R (Amano, Penicillium roqueforti) immobilized on Hyflo Super Cell it is possible to convert at ambient temperature 5-hydroxy-5H-furan-2-one (5) to acetic acid 5-oxo-2,5-dihydrofuran-2-yl ester (1b) by acylation with vinyl acetate in 1:1 cyclohexane−butyl acetate. At 90% conversion the enantiomeric excess of 1b is 100%. This is an example of an enzyme-catalyzed second-order transformation
Kinetic Resolutions and Enantioselective Transformations of 5-(Acyloxy)pyrrolinones Using <i>Candida antarctica </i>Lipase B: Synthetic and Structural Aspects
作者:Agnes D. Cuiper、Milou L. C. E. Kouwijzer、Peter D. J. Grootenhuis、Richard M. Kellogg、Ben L. Feringa
DOI:10.1021/jo991062e
日期:1999.12.1
Various 5-(acyloxy)pyrrolinones have been prepared in enantiomerically pure form by means of an enzymatic resolution or an asymmetric transformation. Either enantiomer is obtained using the same enzyme, Candida antarctica lipase B, by modification of the procedure from transesterification to esterification. N-Acyl-5-(acyloxy)pyrrolinones 1 (R-2 = acyl) are synthesized by applying this method with 100% yield and >99% ee. To rationalize the observed enantioselectivity and the substituent effects of these reactions both empirical models and molecular modeling studies have been used, and a qualitative agreement was found between the results from these studies and the experimental results.
Determination of the Absolute Configuration of 3-Pyrrolin-2-ones
作者:Agnes D. Cuiper、Malgorzata Brzostowska、Jacek K. Gawronski、Wilberth J. J. Smeets、Anthony L. Spek、Henk Hiemstra、Richard M. Kellogg、Ben L. Feringa