Asymmetric Synthesis of β-Amino Esters by Aza-Michael Reaction of α,β-Unsaturated Amides Using (<i>S</i>,<i>S</i>)-(<i>+</i>)-Pseudoephedrine as Chiral Auxiliary
作者:Juan Etxebarria、Jose L. Vicario、Dolores Badia、Luisa Carrillo
DOI:10.1021/jo0357768
日期:2004.4.1
Chiral nonracemic β-amino esters were prepared in good yields and enantioselectivities using the diastereoselective conjugate addition of nitrogen nucleophiles to α,β-unsaturated amides derived from (S,S)-(+)-pseudoephedrine as the key step. In this way, several β-amino amide adducts were prepared using different conjugate acceptors and two different lithium benzylamides as nucleophiles. These adducts