Water → 7-Fluoro-3,4-dihydro-1,4-benzoxazepin-5(2H)-one

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Reaction Steps

6-Fluoro-chroman-4-one (539 mg, 3.24 mmol) was dissolved in Sulfuric acid (6.0 mL) and Sodium azide (258 mg, 3.97 mmol) was added at room temperature. The reaction was stirred for 30 h, then poured into water. The solids were collected by filtration, washing with 50 mL water. After drying, 7-Fluoro-3,4-dihydro-2H-b enzo[f][1,4]oxazepin-5-one was isolated as a white solid (395 mg, 67%). 1H-NMR (CDCl3): 7.65 (m, 1H), 7.15 (m, 1H), 7.01 (m, 1H), 6.74 (s, 1H),

Provenance & Evidence