(3-Bromo-7-fluoro-quinolin-6-yl)-acetic acid methyl ester → (3-Bromo-7-fluoro-quinolin-6-yl)-acetic acid

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Reaction Steps

A suspension of (3-bromo-7-fluoro-quinolin-6-yl)-acetic acid methyl ester (13.9 g, 46.6 mmol) in 72 mL of aqueous NaOH (2N) was heated to reflux for 2 hrs then cooled to r.t. The mixture was washed with dichloromethane (50 mL×2) and the aqueous phase acidified with 5N hydrochloric acid to pH 4. The white precipitate was collected via filtration, washed with water and dried. 11.0 g of the title compound was obtained as white powder in 83.3% yield. 1H NMR (DMSO-d6): δ 12.64 (s, 1H), 8.94˜8.95 (d, 1H), 8.72˜8.72 (m, 1H), 7.94˜7.97 (d, 1H), 7.77˜7.81 (d, 1H), 3.85 (s, 2H). LC-MS: 283.9 (M++1).

Provenance & Evidence