Diphenyl Ether → HCID 13060552, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of dimethyl [{6-pivalamido--4-quinazolinylamino}methylene]propanedioate (24.5 g) and diphenyl ether (150 ml) was heated at 260° C. for 20 minutes and cooled to ambient temperature. To the reaction mixture was added hexane to give crystals, which were filtered off, washed with hexane and dissolved in chloroform (400 ml) under heating. Insoluble materials were removed by filtration. The filtrate was concentrated under reduced pressure to 200 ml and allowed to stand under cooling. The precipitated crystals were filtered off and washed with chloroform to give crystalline methyl 4-oxo-10-pivalamido--4H-pyrimido[1,2-c]quinazoline-3-carboxylate (18.29 g). The mother liqour was concentrated under reduced pressure to give crystals, which were purified by a column chromatography on silica gel (50 g) (Developing solvent: 5% methanol-chloroform solution) and recrystallized from chloroform to give the same object compound (3.2 g).

Provenance & Evidence