[CH3:1][NH:2][NH2:3].Cl[C:5]1[C:10]([C:11]([O:13][CH2:14][CH3:15])=[O:12])=[CH:9][N:8]=[C:7]([S:16][CH3:17])[N:6]=1.O>C(O)C>[CH2:14]([O:13][C:11]([C:10]1[C:5]([N:2]([CH3:1])[NH2:3])=[N:6][C:7]([S:16][CH3:17])=[N:8][CH:9]=1)=[O:12])[CH3:15]A solution of methyl hydrazine (4.0 g, 0.087 mol, 2 eq) in ethanol (50 mL) was slowly added to a solution of ethyl 4-chloro-2-methylthio-5-pyrimidinecarboxylate (10 g, 0.043 mol) in ethanol (50 mL) while keeping the reaction temperature below 15° C. After the addition was completed, the reaction mixture was stirred for 2 hours at the room temperature. Water (100 mL) was then added and the formed product was isolated by filtration. After drying, the product was recrystalized from a 1:1 toluene-hexane mixture to give 7.3 g (69%) of the desired 4-(N-methyl-hydrazino)-2-methylsulfanyl-pyrimidine-5-carboxylic acid ethyl ester; LC/MS (m/e)=243.1 (MH+), Rt=1.15 min.
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