Access to Chiral N-Substituted 1,4-Dihydropyridines Through the One-Pot Domino Michael-Azacyclization Process

The one-pot domino Michael-azacyclization process was applied to the synthesis of chiral Nsubstituted1,4-dihydropyridines. Chiral enaminoesters were reacted with alkylidene malonate olefins or α,β-ethylenic aldehydes. The crucial role of the a-substituent of the starting enaminoester both on thediastereoselectivity and on the orientation of the reaction was clearly evidenced.