C(=O)([O-])[O-].[K+].[K+].Cl[C:8]1[N:13]=[CH:12][CH:11]=[CH:10][N:9]=1.[CH3:14][O:15][C:16]1[CH:23]=[C:22]([O:24][CH3:25])[CH:21]=[CH:20][C:17]=1[CH2:18][NH2:19]>C(#N)C>[CH3:14][O:15][C:16]1[CH:23]=[C:22]([O:24][CH3:25])[CH:21]=[CH:20][C:17]=1[CH2:18][NH:19][C:8]1[N:13]=[CH:12][CH:11]=[CH:10][N:9]=1Potassium carbonate (2.97 g, 21.5 mmol) was added to a mixture of 2-chloropyrimidine (2.1 g, 17.9 mmol), 2,4-dimethoxybenzylamine (3.0 g, 17.9 mmol) and acetonitrile (20 mL). The reaction mixture was heated at reflux for 16 h, allowed to cool to ambient temperature and partitioned between ethyl acetate (150 mL) and water (10 mL). The organic phase was washed with water (2 10 mL) and brine (10 mL), dried over anhydrous sodium sulphate, filtered and concentrated in vacuo. The residue was triturated in diethyl ether (20 mL), washed with hexanes (20 mL) and purified by column chromatography, eluting with a 0-100% gradient of ethyl acetate in hexanes to afford N-(2,4-dimethoxybenzyl)pyrimidin-2-amine as a pale yellow solid in 84% yield (3.70 g): MS (ES+) m/z 245.9 (M+1).
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