It is a common heterocyclic compound, the naphthyridine compound, 7-Chloro-1,8-naphthyridin-2-ol, cas is 15944-34-0 its synthesis route is as follows.
Preparation B 7-methoxy-1H-[1,8]naphthyridin-2-one To a solution of 7-chloro-1H-[1,8]naphthyridin-2-one (prepared as described in J. Org. Chem. (1990), 55, 4744; 5.36 g, 29.68 mmol) in MeOH (98 mL) was added NaOMe (25 wt % in MeOH, 161 mL). The resulting solution was stirred at reflux for 15 h. The solvent was removed in vacuo. Water (100 mL) and EA (80 mL) were added. The phases were separated and the aq. layer was extracted with EA (8*80 mL). The combined org. layers were washed with brine (50 mL), dried over MgSO4, filtered and evaporated under reduced pressure. The title compound was obtained as a beige solid (5.22 g, 100% yield). 1H NMR (d6DMSO) delta: 11.96 (s, 1H); 7.96 (d, J=8.5 Hz, 1H); 7.81 (d, J=9.4 Hz, 1H); 6.63 (d, J=8.5 Hz, 1H); 6.34 (d, J=9.4 Hz, 1H); 3.90 (s, 3H).
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Reference£º
Patent; Actelion Pharmaceuticals Ltd.; US2012/40989; (2012); A1;,
1,8-Naphthyridine – Wikipedia
1,8-Naphthyridine | C8H6N2 – PubChem