Hydrazine hydrate (1:1) → 2H-1-Benzazepin-2-one, 8-amino-1-ethyl-1,3,4,5-tetrahydro-

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Reaction Steps

To a solution of 1-ethyl-8-nitro-1,3,4,5-tetrahydro-benzo[b]azepin-2-one (920 mg, 3.9 mmol, WO2002100327A2) in EtOH (13 mL) was sequentially added 10% Pd/C (155 mg) and hydrazine-monohydrate (3 mL). The solution was warmed to reflux for 2.5 h, cooled, filtered through celite, and repeatedly evaporated from toluene to remove residual hydrazine to afford 8-amino-1-ethyl-1,3,4,5-tetrahydro-benzo[b]azepin-2-one (805 mg, 100%) that had the following properties: LC/MS (ESI+): 205 (M+H); 1H-NMR (CDCl3, 400 MHz): δ 6.97 (d, J=7.8, 1H), 6.55 (s, 1H), 6.52 (d, J=7.8, 1H), 3.95 (br s, 2H), 3.67 (br s, 2H), 2.60 (br s, 2H), 2.29 (m, 2H), 2.11 (m, 2H), 1.15 (t, J=6.2, 3H).

Provenance & Evidence