反应详情

To a stirred solution of methyl 3-(8-(6-(2-(methoxymethyl)pyrrolidin-1-yl)pyridin-2-ylamino)imidazo[1,2-b]pyridazin-6-yl)benzoate (0.155 g, 0.34 mmol) in dioxane (10 mL) and H2O (4 mL) was added NaOH (135 mg, 3.4 mmol) at 40° C. After 4 h the mixture was washed with ether (10 mL), the aqueous layer adjusted to pH=4 with concentrated HCl, then was concentrated and filtered. The collected solid was washed with ether and dried to afford 3-(8-(6-(2-(methoxymethyl)pyrrolidin-1-yl)pyridin-2-ylamino)imidazo[1,2-b]pyridazin-6-yl)benzoic acid (0.037 g, 28% over two steps) as a yellow solid. 1H NMR (300 MHz, CD3OD): δ 8.80 (s, 1H), 8.54 (s, 1H), 8.20-8.08 (m, 3H), 7.72 (d, 1H, J=1.5 Hz), 7.59 (t, 1H, J=7.8 Hz), 7.45 (t, 1H, J=7.8 Hz), 6.31 (d, 1H, J=7.5 Hz), 6.17 (d, 1H, J=8.4 Hz), 4.21 (brs, 1H), 3.62-3.58 (m, 1H), 3.51-3.42 (m, 2H), 3.34-3.32 (m, 1H), 3.11 (s, 3H), 2.10-2.00 (m, 4 h). LC-MS: [M+H]+, 445, tR=1.714 min, HPLC: 95.14% at 214 nm, 95.00% at 254 nm, tR=5.9 min.

1. washAfter 4 h the mixture was washed with ether (10 mL)
2. concentrationwas concentrated
3. filtrationfiltered
4. washThe collected solid was washed with ether
5. customdried