Triethylamine → 1-Methyl-3-trifluoromethyl-1H-pyrazole-4-sulfonic acid {1-[4-(5-fluoro-2-methoxy-pyridin-3-yl)-phenyl]-ethyl}-amide

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Reaction Steps

The organic phase was washed with water, brine and dried over anhydrous magnesium sulfate. The solvent was evaporated and the residue chromatographed on silica gel to give to give 2-{1-[4-(5-fluoro-2-methoxy-pyridin-3-yl)-phenyl]-ethyl}-isoindole-1,3-dione (0.31 g, 0.82 mmol, 41%). To a solution of 2-{1-[4-(5-fluoro-2-methoxy-pyridin-3-yl)-phenyl]-ethyl}-isoindole-1,3-dione (0.31 g, 0.8 mmol) in dioxan/methanol (1:1, 10 ml) was added hydrazine hydrate (0.83 g, 46.5 mmol). The reaction was stirred at room temperature for 24 h. The solvent was evaporated and dichloromethane added. The resultant white solid was filtered off and dried to give 1-[4-(5-fluoro-2-methoxy-pyridin-3-yl)-phenyl]-ethylamine (0.21 g, 0.8 mmol, 100%) as a clear oil. To a solution of 1-[4-(5-fluoro-2-methoxy-pyridin-3-yl)-phenyl]-ethylamine (0.1 g, 0.4 mmol) in dichloromethane (2 ml) was added triethylamine (123 mg, 1.2 mmol) and 1-methyl-3-(trifluoromethyl)-1H-pyrazole-4-sulfonylchloride (111 mg, 0.45 mmol). The reaction mixture was agitated for 16 h and quenched with saturated aqueuos sodium bicarbonate solution. The organic phase was washed with water, brine and dried over anhydrous magneium sulfate. The residue was chromatographed on silica gel to give the title compound (42 mg, 0.1 mmol, 25%). 1H NMR (400 MHz, CDCl3): δ 8.00 (d, 1H), 7.45 (m, 3H), 7.35 (dd, 1H), 7.21 (d, 2H), 4.86 (d, 1H), 4.60 (q, 1H), 3.96 (s, 3H), 3.75 (s, 3H), 1.50 (b, 3H) ppm; MS (ESI) m/z: 459.3 [M+H]+.

Provenance & Evidence