Dimethyl[[6-(2-methylpropionamido)-4-quinazolinylamino]methylene]propanedioate → methyl 4-oxo-10-(2-methylpropionamido)-4H-pyrimido[1,2-C]quinazoline-3-carboxylate

Participants

Reaction Conditions

Reaction Steps

A mixture of dimethyl[[6-(2-methylpropionamido)-4-quinazolinylamino]methylene]propanedioate (8.4 g) in diphenyl ether (42 ml) was stirred at 255° C. for 15 minutes. The reaction mixture was cooled to ambient temperature to give crystals which were filtered off, washed with hexane and dried. There were obtained 6.9 g of the crude crystals. The crude crystals were dissolved in a mixture of chloroform and methanol (4:1) under heating. Insoluble materials were removed by filtration. The filtrate was concentrated under reduced pressure to about 150 ml. After cooling, there was obtained crystalline methyl 4-oxo-10-(2-methylpropionamido)-4H-pyrimido[1,2-C]quinazoline-3-carboxylate (5.85 g).

Provenance & Evidence