Thionyl Chloride → HCID 13435046, compound

Participants

Reaction Steps

2-trans-[2-(2-methyl-phenyl)-ethenyl]-3-propyl-4-oxo-4H-pyrido[1,2-a]pyrimidine-7-carboxylic acid (1,2 g) was reacted with thionyl chloride (0.6 ml) in dioxane (12 ml) at reflux temperature for 1 hour, then the mixture was evaporated to dryness in vacuo. The residue was reacted with excess methanol at 50° C. for 30 minutes, then the solution was concentrated in vacuo and the residue diluted with ice water. Filtration of the precipitate gave 1.2 g of 2-trans-[2-(2-methyl-phenyl)-ethenyl]-3-propyl-4-oxo-4H-pyrido[1,2-a]pyrimidine7-carboxylic acid, methyl ester, m.p. 190°-193° C. By proceeding analogously the following compounds were prepared:

Provenance & Evidence