[CH3:1][I:2].[CH3:3][O:4][C:5]1[CH:6]=[CH:7][CH:8]=[C:9]2[C:14]=1[NH:13][C:12](=[S:15])[NH:11][CH:10]2[CH3:16]>CC(C)=O>[IH:2].[CH3:3][O:4][C:5]1[CH:6]=[CH:7][CH:8]=[C:9]2[C:14]=1[N:13]=[C:12]([S:15][CH3:1])[NH:11][CH:10]2[CH3:16]Methyl iodide (1.92 g, 14 mmol) was added to a solution of 8-methoxy-4-methyl-3,4-dihydro-1H-quinazoline-2-thione (940 mg, 5 mmol) in acetone (6 ml), and the mixture was stirred for 3 h at r.t. The precipitated title compound (1.2 g, 76%) was filtered off and was used without further purification in the next step.
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