Practical enantioselective Diels-Alder and aldol reactions using a new chiral controller system
作者:E. J. Corey、Rene Imwinkelried、Stanislaw Pikul、Yi Bin Xiang
DOI:10.1021/ja00196a081
日期:1989.7
Catalyse par le complexe cyclique Al [−N(SO 2 CF 3 )(CHPh) 2 (CF 3 SO 2 )N-] R, R=i-Bu, CH 3
催化par le complexe cyclique Al [-N(SO 2 CF 3 )(CHPh) 2 (CF 3 SO 2 )N-] R, R=i-Bu, CH 3
Effect of clay calcination on clay-catalysed Diels-Alder reactions of cyclopentadiene with methyl and (−)-menthyl acrylates
作者:Carlos Cativiela、José M. Fraile、José I. García、José A. Mayoral、Elisabeth Pires、François Figueras、Louis C. de Mènorval
DOI:10.1016/s0040-4020(01)88236-3
日期:1992.1
10-montmorillonites, activated by several methods, are used as catalysts in the reaction between methyl acrylate and cyclopentadiene. Calcined clays are better catalysts than dried clays. Zn(II) clays, dried and calcined, are compared as catalysts of the asymmetric Diels-Alderreaction between (−)-methyl acrylate and cyclopentadiene. Calcined clay again shows a higher catalytic activity and leads to better
Zn(II)-exchanged K10 montmorillonite is shown to be an efficient catalyst for the reaction between cyclopentadiene and (−)-menthyl acrylate, leading to the 1R,2R-cycloadduct with good chemical yield, high % d.e. and excellent endo/exo selectivity.
The chiral induction in the Diels-Alder addition 1 → 2, assessed reliably by 19F-NMR-spectroscopy of the endo-esters 4, varied between 47 - 93% in favor of the 2-(R)-adducts 2 depending on the auxiliary chiral group and the Lewis-acid catalyst.
The reaction of optically active menthyl acrylate with cyclopentadiene on γ-alumina
作者:George Hondrogiannis、Richard M. Pagni、George W. Kabalka、Robert Kurt、Danielle Cox
DOI:10.1016/s0040-4039(00)79909-6
日期:1991.5
The Diels-Alder reaction of optically activementhyl acrylate with cyclopentadiene is catalyzed by γ-alumina. The reaction is very selective, yielding large endo to exo ratios of products and diasteroemeric excesses for the endo adduct.