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.
cis,cis-Spiro[4.4]nonane-1,6-diol: A new chiral auxiliary for the asymmetric Diels-Alder reaction
作者:James A. Nieman、Brian A. Keay
DOI:10.1016/s0957-4166(96)00459-4
日期:1996.12
The use of a mono-pivalate mono-acrylate bis-ester of (+)-1S,5S,6S-spiro[4.4]nonane-1,6-diol in an asymmetric Diels-Alderreaction with cyclopentadiene (2 equiv. BCl3, −85°C, CH2Cl2) provided the expected endo bicyclo adduct in >97% de. Iodolactonization of the bicyclo adduct provided the (+)-lactone (5) with a 1S,4S,6S,8R,9S configuration (97% ee). The de's obtained from using various types and amounts
Asymmetric Diels-Alder Reactions of Chiral Acrylates of Cholic Acid Derivatives
作者:Packiarajan Mathivanan、Uday Maitra
DOI:10.1021/jo00107a015
日期:1995.1
Influence of polar groups in thermal and Lewis acid promoted asymmetric diels-alder additions: lactic acid derivatives as practical highly selective and configurationally dichotomic reagents