Hydrochloric Acid → 5-Methoxy-4-oxo-1-(2,2,3,3,7-pentafluoro-2,3-dihydro-1,4-benzodioxin-6-yl)-1,4-dihydropyridazine-3-carboxylic acid

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Reaction Steps

To a solution of methyl 5-methoxy-4-oxo-1-(2,2,3,3,7-pentafluoro-2,3-dihydro-1,4-benzodioxin-6-yl)-1,4-dihydropyridazine-3-carboxylate (2.58 g, 6.31 mmol) in MeOH (26 mL) was added 1 M NaOH aqueous solution (13 mL) at 0° C. The mixture was stirred at room temperature for 90 min. To the mixture was added 1 M HCl aqueous solution (13 mL) at 0° C. The mixture was concentrated in vacuo. The precipitates were collected by filtration, washed with water and dried in vacuo at 60° C. to yield the title compound (2.33 g, 94% yield) as a white solid: 1H NMR (DMSO-d6, 300 MHz): δ ppm 3.86 (3H, s), 8.06 (1H, d, J=10.2 Hz), 8.17 (1H, d, J=6.8 Hz), 8.82 (1H, s), 14.66 (1H, brs).

Provenance & Evidence