Diphenyl Ether → 7-(3,5-Dimethylisoxazol-4-yl)-6-methoxyquinolin-4-ol

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Reaction Steps

7-(3,5-Dimethyl-4-isoxazolyl)-6-(methyloxy)-4-oxo-1,4-dihydro-3-quinolinecarboxylic acid (for a preparation see Intermediate 5) (8 g, 25.5 mmol) was added in small portions to refluxing diphenyl ether (150 ml) and the resulting solution was stirred for 30 min, then allowed to cool to 35° C. before addition of diethyl ether (200 ml). The resulting suspension was filtered and the solid product washed with ether (100 ml) to give 7-(3,5-dimethyl-4-isoxazolyl)-6-(methyloxy)-4(1H)-quinolinone (6.9 g, 25.5 mmol, 100% yield) as a beige solid. LCMS (formate) Rt 0.61, MH+ 271.

Provenance & Evidence