Sodium Hydroxide → 3,6-Dichloro-4-[methyl(oxan-4-yl)amino]pyridine-2-carboxylic acid

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Reaction Steps

To a stirred solution of methyl 3,6-dichloro-4-[methyl(oxan-4-yl)amino]pyridine-2-carboxylate (114 mg, 0.36 mmol) in THF (5 ml) was added 2M aqueous NaOH (0.89 ml, 1.79 mmol) and the reaction mixture was left to stir at room temperature for 20 h after which time the THF was evaporated in vacuo. The aqueous phase was then treated with an aqueous 10% citric acid solution to pH 5-6 and then extracted with EtOAc (3×50 ml) followed by a solution of 1:1 IPA/CHCl3 (2×50 ml), the combined organic phases were then washed with brine (50 ml) dried with Na2SO4 and evaporated to give the title compound as a white solid (85 mg, 78%). LC-MS 100%, 1.47 min (3.5 minute LC-MS method), m/z=305.5/306.9, 1H NMR (500 MHz, Methanol-d4) δ 7.10 (s, 1H), 4.03 (dd, J=11.5, 4.4 Hz, 2H), 3.99-3.86 (m, 1H), 3.47 (t, J=11.0 Hz, 2H), 2.90 (s, 3H), 2.05-1.90 (m, 2H), 1.74 (d, J=12.4 Hz, 2H).

Provenance & Evidence