Ammonium Chloride → N-[5-[(3,5-Dimethoxyphenyl)methoxy]-2H-pyrazol-3-yl]-5-(4-methylpiperazin-1-yl)pyridine-2-carboxamide

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Reaction Steps

NaHMDS (1M solution in THF, 0.45 ml, 0.451 mmol, 1.5 eq) was added dropwise to a stirred suspension of tert-butyl 5-amino-3-[(3,5-dimethoxyphenyl)methoxy]pyrazole-1-carboxylate (105 mg, 0.301 mmol, 1 eq) and methyl 5-(4-methylpiperazin-1-yl)pyridine-2-carboxylate (85 mg, 0.361 mmol, 1.2 eq) in dry THF (2.5 ml) under nitrogen. The solution was stirred at room temperature for 1 h. The solution was neutralised with satd. aq. NH4Cl and diluted with water (5 ml). The aqueous phase was extracted with ethyl acetate (3×8 ml) and the combined organic extracts were dried over MgSO4, filtered and evaporated. The reaction was repeated as above on a 0.338 mmol scale. The crude extracts were combined with those above and purified on by silica column chromatography, eluting with 0-6% MeOH in DCM, to afford the title compound as a pale brown solid (92 mg, 35% yield); 1H NMR (399.902 MHz, DMSO) δ 2.25 (s, 3H), 2.45-2.50 (m, 4H), 3.37-3.43 (m, 4H), 3.75 (s, 6H), 5.08 (s, 2H), 5.88 (bs, 1H), 6.45 (t, 1H), 6.60 (d, 2H), 7.45-7.49 (m, 1H), 7.94 (d, 1H), 8.35 (d, 1H), 10.89 (bs, 1H), 11.36 (bs, 1H) MS: m/z 453 (MH+)

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