[Cl:1][C:2]1[C:7]([C:8](Cl)=[O:9])=[C:6]([O:11][CH3:12])[N:5]=[C:4]([S:13][CH3:14])[N:3]=1.C(Cl)Cl.[NH2:18][CH2:19][C:20]1[N:25]=[CH:24][CH:23]=[CH:22][N:21]=1.C(N(CC)CC)C>O>[Cl:1][C:2]1[C:7]([C:8](=[O:9])[NH:18][CH2:19][C:20]2[N:25]=[CH:24][CH:23]=[CH:22][N:21]=2)=[C:6]([O:11][CH3:12])[N:5]=[C:4]([S:13][CH3:14])[N:3]=1To a mixture of whole amount of 4-chloro-5-chloroformyl-6-methoxy-2-methylthiopyrimidine (prepared in the above (4)) and methylene chloride 10 ml is dropped a mixture of 2-aminomethylpyrimidine 930 mg, triethylamine 2.38 ml and methylene chloride 10 ml over a period of 5 minutes on an ice bath, and the mixture is stirred for 20 minutes. The mixture is further stirred at room temperature for 40 minutes. The reaction mixture is diluted with water and the water layer is extracted with methylene chloride. The organic layer is dried and concentrated in vacuo. The residue is separated with silica gel chromatography (solvent; chloroform:ethyl acetate 1:1) and recrystallized from a mixture of methylene chloride, ethyl acetate and isopropyl ether to give 4-chloro-5-[N-(2-pyrimidinylmethyl)carbamoyl]-6-methoxy-2-methylthiopyrimidine as a colorless crystalline powder, 1.56 g. mp 176–177° C.
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