Hydrochloric Acid → HCID 178498606, compound

Participants

Reaction Conditions

Reaction Steps

To a stirred suspension of dimethyl 7-chloro-4-hydroxyquinoline-2,3-dicarboxylate (1.0 g, 3.38 mmol) in water (20 mL) was added an aqueous solution of sodium hydroxide (0.27 g, 6.75 mmol). Upon addition, the suspension dissolved. The reaction mixture was warmed to 60° C. for 1 hour. After this time the reaction was cooled to room temperature and acidified with concentrated hydrochloric acid. The product was then extracted into diethyl ether and ethyl acetate. The organic extracts were dried over MgSO4, filtered and concentrated in vacuo to provide the title compound as a solid (900 mg). This material was purified by recrystallization employing an ethyl acetate/hexane co-solvent system to provide the title compound (571 mg, 60%) as a white solid mp 296° C. (dec); MS (CI)=238 (M+H). Analysis for C12H8NO5Cl.0.45 CH3CO2CH2CH3.0.10 H2O: Calc'd: C, 51.30; H, 3.68; N 4.34, Found: C, 51.28; H, 3.62; N 3.97 1H NMR 8.22 (d, J=8.7 Hz, 1H), 7.92 (d, J=1.8 Hz, 1H), 7.28 (dd, J=8.7, 1.8 Hz, 1H), 3.90 (s, 3H).

Provenance & Evidence