A process for the preparation of dihydropyridines

Details A process for the preparation of dihydropyridines A process for the preparation of dihydropyridines

C - Chemistry, Metallurgy

07

D

C07D 211/90 (2006.01) C07C 67/343 (2006.01) C07C 69/738 (2006.01) C07C 201/12 (2006.01) C07C 205/56 (2006.01)

Patent

CA 2263601

A process for the preparation of dihydropyridines of formula (V) by Knoevenagel condensation of a benzaldehyde with an acetoacetic ester in the presence of .beta.-alanine as a catalyst, and subsequent cyclocondensation of the resulting benzylidene acetoacetic ester with an amino crotonic ester.

L'invention a pour objet la préparation de dihydropyridines présentant la formule (V). Ce procédé comprend la condensation Knoevenagel d'un benzaldéhyde avec un ester acétoacétique en présence de .beta.-alanine comme catalyseur; suivie de la cyclocondensation de l'ester acétoacétique de benzylidène ainsi obtenu avec un ester amino crotonique.

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