An Entry to a Chiral Dihydropyrazole Scaffold: Enantioselective [3 + 2] Cycloaddition of Nitrile Imines
摘要:
We have developed a versatile strategy to access dihydropyrazoles in highly enantioenriched form. Dipolar cycloaddition of electron-deficient acceptors and in situ-generated nitrile imines proceeds with high regio- and enantioselectivity using 10 mol % chiral Lewis acid catalyst. A variety of dihydropyrazoles that incorporate functionality for further manipulation have been prepared.
Enantioselective Diels–Alder reactions of 3-(acyloxy)acrylates
作者:Mukund P. Sibi、Hirofumi Matsunaga
DOI:10.1016/j.tetlet.2004.05.090
日期:2004.7
Diels-Alder reactions with 3-(acyloxy)acrylates using chiral Lewis acid catalysts have been successfully carried out. These reactions proceed with high enantioselectivity when a chiral Lewis acid derived from Cu(OTf)(2) and a bisoxazoline is used. The facility of the reaction is dependent on the nature of the acyloxy group in the dienophile. (C) 2004 Elsevier Ltd. All rights reserved.
Enantioselective Conjugate Radical Addition toβ-Acyloxy Acrylate Acceptors: An Approach to Acetate Aldol-Type Products
作者:Mukund P. Sibi、Jake Zimmerman、Tara Rheault
DOI:10.1002/anie.200352096
日期:2003.9.29
An Entry to a Chiral Dihydropyrazole Scaffold: Enantioselective [3 + 2] Cycloaddition of Nitrile Imines
作者:Mukund P. Sibi、Levi M. Stanley、Craig P. Jasperse
DOI:10.1021/ja051650b
日期:2005.6.1
We have developed a versatile strategy to access dihydropyrazoles in highly enantioenriched form. Dipolar cycloaddition of electron-deficient acceptors and in situ-generated nitrile imines proceeds with high regio- and enantioselectivity using 10 mol % chiral Lewis acid catalyst. A variety of dihydropyrazoles that incorporate functionality for further manipulation have been prepared.