Cycloaddition Reaction of 2-Azadienes Derived from β-Amino Acids with Electron-Rich and Electron-Deficient Alkenes and Carbonyl Compounds. Synthesis of Pyridine and 1,3-Oxazine Derivatives
作者:Francisco Palacios、Esther Herrán、Gloria Rubiales、Jose María Ezpeleta
DOI:10.1021/jo016273+
日期:2002.4.1
Functionalized keto-enamines 6 were obtained by nucleophilic addition of enol ethers to the imine moiety of 2-azadienes derived from dehydroaspartic esters 4. Reactions of 2-azadiene 4c containing three electron-withdrawing substituents (CO(2)R) with enol ethers 5 in the presence of lithium perchlorate led to the formation of tetrahydropyridine derivatives7 in a regio- and stereoselective fashion