Sodium Hydroxide → 3-(8-(6-(2-Methylpyrrolidin-1-yl)pyridin-2-ylamino)imidazo[1,2-b]pyridazin-6-yl)benzoic acid

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Reaction Conditions

Reaction Steps

To a solution of methyl 3-(8-(6-(2-methylpyrrolidin-1-yl)pyridin-2-ylamino)imidazo[1,2-b]pyridazin-6-yl)benzoate (210 mg, 0.49 mmol) in dioxane (10 mL) and water (10 mL) was added NaOH (150 mg, 3.75 mmol), The mixture was heated to 40° C. with stirring for 2 h. The solution was concentrated in vacuo, washed with dichloromethane (10 mL×3), then additional water (10 mL) was added and this solution was adjusted to pH=4 by addition of concentrated HCl. The solid formed was filtered to give 3-(8-(6-(2-methylpyrrolidin-1-yl)pyridin-2-ylamino)imidazo[1,2-b]pyridazin-6-yl)benzoic acid (0.160 g, 78%) as a light yellow solid. 1H NMR (300 MHz, DMSO): δ 13.25 (s, 1H), 9.74 (s, 1H), 8.85 (s, 1H), 8.50 (s, 1H), 8.26-8.08 (m, 3H), 7.72-7.67 (m, 2H), 7.53-7.44 (m, 1H), 6.75 (d, 1H, J=7.8 Hz), 6.09 (d, 1H, J=8.1 Hz), 4.25-4.21 (m, 1H), 3.62-3.57 (m, 1H), 2.13-1.98 (m, 3H), 1.70-1.68 (m, 2H), 1.12 (d, 3H, J=6.0 Hz). LC-MS: [M+H]+, 415, tR=1.68 min, HPLC: 98.2% at 214 nm, 98.37% at 254 nm, tR=6.21 min.

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