Process for preparation of 4h-4-oxo-quinolizine-3-carboxylic...

Details Process for preparation of 4h-4-oxo-quinolizine-3-carboxylic... Process for preparation of 4h-4-oxo-quinolizine-3-carboxylic...

C - Chemistry, Metallurgy

07

D

C07D 455/02 (2006.01)

Patent

CA 2281734

A process for the preparation of a compound having formula (a) wherein R1, R2, R3, R4, and R5 are defined, from an enamine by chain expansion and ring closure followed by additional derivatization, treatment with a 3-alkoxyl- acryloyl compound, another ring closure, and converting a hydroxyl group to a leaving group.

L'invention porte sur un procédé de préparation d'un composé de formule (a) dans laquelle R?1¿, R?2¿, R?3¿, R?4¿ et R?5¿ sont obtenus à partir d'une énamine par expansion en chaîne et fermeture du cycle, suivie de dérivations additionnelles, puis d'un traitement par un composé 3-alkoxyle-acryloyle, puis d'une autre fermeture du cycle, puis de la conversion du groupe hydroxyle en groupe partant.

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