[C:1](Cl)(Cl)=[O:2].[Cl:5][C:6]1[CH:11]=[CH:10][CH:9]=[C:8]([Cl:12])[C:7]=1[NH:13][CH2:14][C:15]1[C:16]([NH2:23])=[N:17][C:18]([S:21][CH3:22])=[N:19][CH:20]=1.C(N(CC)CC)C.[Cl-].[NH4+]>O1CCCC1>[Cl:12][C:8]1[CH:9]=[CH:10][CH:11]=[C:6]([Cl:5])[C:7]=1[N:13]1[CH2:14][C:15]2[C:16](=[N:17][C:18]([S:21][CH3:22])=[N:19][CH:20]=2)[NH:23][C:1]1=[O:2]
A stirred solution, cooled in ice, of 5.8 ml (11.2 mmol) of phosgene (20% in toluene) in 80 ml of tetrahydrofuran was treated dropwise with a solution of 1.76 g (5.6 mmol) of 5-(2,6-dichlorophenyl)aminomethyl-4-amino-2-methylthiopyrimidine and 1.6 ml (11.2 mmol) of triethylamine in 80 ml of tetrahydrofuran. The mixture was stirred for 1 hour. 50 ml of tetrahydrofuran and 50 ml of saturated aqueous ammonium chloride solution were added. The phases were separated and the organic phase was washed with saturated aqueous ammonium chloride solution, dried over magnesium sulfate, filtered and evaporated to give 1.7 g (89%) of 3-(2,6-dichlorophenyl)-7-methylthio-3,4-dihydropyrimido[4,5-d]pyrimidin-2(1H)-one as a white solid.
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