[OH:1][CH:2]1[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][N:10]=2)[N:5]=[CH:4][CH:3]1C(O)=O>N1C2C(=CC=CC=2)C=CC=1>[N:5]1[C:6]2[C:11](=[N:10][CH:9]=[CH:8][CH:7]=2)[C:2]([OH:1])=[CH:3][CH:4]=14-hydroxy-3,4-dihydro-1,5-naphthyridine-3-carboxylic acid (1.4 g, 7.3 mmol) was dissolved in quinoline (50 ml). The mixture was heated to 200° C. for 2 hours, and then cooled to room temperature. The reaction mixture was filtered to give 1,5-naphthyridin-4-ol.
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