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0 °C

A solution of 1,6-naphthyridin-5(6H)-one (3.2 g, 21.9 mmol) in phosphoryl trichloride (50 mL) was stirred at 100° C. overnight. The solvent was removed under vacuum. The residue was cooled to 0° C. Sodium hydroxide (saturated aqueous solution) was added to adjust the pH to 9. The mixture was extracted with EtOAc (200 mL×3). The combined organic layers were dried over sodium sulfate and concentrated under vacuum to give 3.3 g of the crude product as a yellow solid. MS (ESI): m/z 165 [M+H]+.

1. customThe solvent was removed under vacuum
2. additionSodium hydroxide (saturated aqueous solution) was added
3. extractionThe mixture was extracted with EtOAc (200 mL×3)
4. dry with materialThe combined organic layers were dried over sodium sulfate
5. concentrationconcentrated under vacuum