Sodium Hydroxide → 7-amino-2,3,4,5-tetrahydro-1H-benzo[c]azepin-1-one

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6-Amino-3,4-dihydro-2H-naphthalen-1-one oxime (1.80 g, 10.2 mmol) and polyphosphoric acid (30 ml) were mixed together. The viscous mixture was heated to 100° C. with vigorous stirring as the mixture became homogeneous. After cooling to room temperature, the mixture was diluted with water (30 ml). 15% aqueous sodium hydroxide was added until the mixture became basic. Extraction with ethyl acetate (50 ml), drying over anhydrous magnesium sulfate, and concentration yielded a brown oil. Preparative TLC (5% MeOH/CH2Cl2) afforded 7-Amino-2,3,4,5-tetrahydro-benzo[c]azepin-1-one (Bioorganic & Medicinal Chem. Lett., 2003, 13 4197) as a light brown oil, 21 mg. 1H NMR (400 MHz, DMSO-d6) δ 7.53 (s, 1H), 7.14-7.22 (m, 1H), 6.42-6.47 (m, 1H), 6.33 (s, 1H), 5.44 (s, 2H), 2.87-2.93 (m, 2H), 2.53-2.60 (m, 2H), 1.78-1.87 (m, 2H); MS (m/e) 177 (M+1).

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