On the enhancement of stereoselection by cooperation between chiral auxiliaries. Asymmetric diels-alder reactions with fumaric acid bis ((S)-proline benzyl ester) amide
作者:H. Waldmann、M. Dräger
DOI:10.1016/s0040-4039(01)80696-1
日期:1989.1
Fumaric acid bis ((S)-proline benzyl ester) amide reacts with cyclopentadiene in thermal and Lewis acid catalyzed Diels-Alderreactions to give the cycloadducts with high yields and diastereomeric ratios up to 100:1.
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).