Copper-Catalyzed Enantioselective Henry Reactions of α-Keto Esters: An Easy Entry to Optically Active β-Nitro-α-hydroxy Esters and β-Amino-α-hydroxy Esters
作者:Christina Christensen、Karsten Juhl、Rita G. Hazell、Karl Anker Jørgensen
DOI:10.1021/jo025690z
日期:2002.7.1
The catalytic enantioselective Henry reaction of alpha-keto esters with nitromethane has been developed. The reaction conditions have been optimized by the screening of different chiral Lewis acids, solvents, and bases, and it was found that the copper(II)-tert-butyl bisoxazoline complex in combination with triethylamine catalyzed a highly enantioselective reaction giving opticallyactive beta-nitro-alpha-hydroxy