Diels-Alder reactions in aqueous solutions. Enforced hydrophobic interactions between diene and dienophile
作者:Wilfried Blokzijl、Michael J. Blandamer、Jan B. F. N. Engberts
DOI:10.1021/ja00011a029
日期:1991.5
The intermolecular as well as the intramolecular Diels-Alderreaction are characterized by large rate accelerations upon going from an organic solvent to water as the reaction medium. A model for solvation effects on rate constants for Diels-Alderreactions in aqueous solutions is developed. The typical, huge rate enhancements for Diels-Alderreactions in water and in highly aqueous binary mixtures are
Use of bis(oxazoline)-metal complexes as chiral catalysts for asymmetric Diels-Alder reactions using 2-acetyl-1,4-naphthoquinone as a dienophile
作者:Margaret A. Brimble、John F. McEwan
DOI:10.1016/s0957-4166(97)00562-4
日期:1997.12
Asymmetric Diels-Alder reactions of 1,4-naphthoquinone and 2-acetyl-1,4-naphthoquinone with cyclopentadiene catalyzed by bis(oxazoline)-metal complexes afforded the corresponding Diels-Alder adducts. Moderate levels of enantiomeric excess were obtained and a number of different reaction conditions evaluated. (C) 1997 Elsevier Science Ltd. All rights reserved.