Cl[S:2]([C:5]1[CH:10]=[CH:9][C:8]([C:11]2[N:12]=[C:13]3[N:18]=[CH:17][CH:16]=[CH:15][N:14]3[CH:19]=2)=[CH:7][CH:6]=1)(=[O:4])=[O:3].[CH3:20][NH:21][CH3:22]>O>[CH3:20][N:21]([CH3:22])[S:2]([C:5]1[CH:10]=[CH:9][C:8]([C:11]2[N:12]=[C:13]3[N:18]=[CH:17][CH:16]=[CH:15][N:14]3[CH:19]=2)=[CH:7][CH:6]=1)(=[O:4])=[O:3]2.9 g (0.01 mol) of 2-(4-Chlorosulphonyl-phenyl)-imidazo[1,2-a]pyrimidine are suspended in 60 ml of a 40% solution of dimethylamine in water. The mixture is heated to 50° C. for 30 minutes, diluted with 50 ml of water, extracted with ethyl acetate, then the ethyl acetate extract is dried and evaporated to dryness. The residue is recrystallised from dimethylformamide.
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