Sodium hydride → 6-(Bis(4-methoxybenzyl)amino)-4-methylnicotinonitrile

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To a stirred mixture of 6-amino-4-methylnicotinonitrile 4-2, which was prepared by using a similar method described in WO199618616 (669 mg, 5.02 mmol) and N,N-dimethylformamide (15.0 mL) at 0° C. under an atmosphere of nitrogen gas was added sodium hydride (60% dispersion in mineral oil; 605 mg, 15.1 mmol). To the mixture was added 4-methoxybenzyl chloride (1.70 mL, 12.5 mmol) at 0° C. The resulting mixture was stirred at 0° C. for 2 hours under an atmosphere of nitrogen gas. The reaction mixture was quenched with methanol (5.0 mL) and concentrated under reduced pressure. To the resulting residue was added water (50 mL) and the resulting mixture was extracted with dichloromethane (60 mL, 30 mL×2). The combined organic extracts were washed with brine (30 mL), dried over sodium sulfate, and concentrated under reduced pressure. The resulting residue was purified by column chromatography (silica gel 30 g, step gradient eluting with 10:1, 5:1, and 2:1 hexane/ethyl acetate) to give 1.78 g (95%) of 4-3 as a pale brown solid: 1H NMR (300 MHz, CDCl3) δ 8.39 (1H, s), 7.11 (4H, m), 6.85 (4H, m), 6.32 (1H, s), 4.71 (4H, br s), 3.79 (6H, s), 2.33 (3H, s); ESI-MS m/z 374 [C23H23N3O2+H]+.

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