Methyl iodide → 2-Benzylimino-6-(3,4-dimethoxyphenyl)-1,3-dimethyl-1,2,3,4-tetrahydro-4-(2,4,6-trimethylphenylimino)pyrimidine

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To a solution of 3,4-dihydro-6-(3,4-dimethoxyphenyl)-3-methyl-2-(N-methyl-N-benzylamino)-4-(2,4,6-trimethylphenylimino)pyrimidine (1.0 g) in tetrahydrofuran (20 ml) was added methyl iodide (2.58 ml). The solution was refluxed for 10 hours and cooled to ambient temperature. The reaction mixture was evaporated in vacuo and the residue was chromatographed on silica gel using chloroform to give 2-benzylimino-6-(3,4-dimethoxyphenyl)-1,3-dimethyl-1,2,3,4-tetrahydro-4-(2,4,6-trimethylphenylimino)pyrimidine (0.62 g).

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