Hydrochloric Acid → HCID 56978109, compound

Participants

Reaction Steps

To a mixture of 2.5 g. (0.02 mole) of p-chloroaniline and 10 ml. of a 1:1 diluted aqueous hydrochloric acid a solution of 1.4 g. (0.01 mole) of sodium nitrite and 10 ml. of water is slowly added dropwise at 0°-5° C. under stirring. To the reaction mixture 12.0 g. of solid sodium acetate are added in portions, whereupon a solution of 4.7 g. (0.02 mole) of ethyl-6-methyl-4-oxo-6,7,8,9-tetrahydro-4H-pyrido(1,2-a)pyrimidine-3-carboxylate and 10 ml. of water is slowly added dropwise under vigorous stirring. The reaction mixture is stirred at 0°-5° C. for 2-3 hours, whereupon it is allowed to stand in a refrigerator overnight. The precipitated crystals are filtered off and washed with a small amount of water. After recrystallization from ethanol 4.2 g. (56.0%) of ethyl-9-(p-chloro-phenyl-hydrazono)-6-methyl-4-oxo-6,7,8,9-tetrahydro-4H-pyrido(1,2-a)pyrimidine-3-carboxylate are obtained. Mp.: 177°-178° C.

Provenance & Evidence