Sodium Azide → 8-methoxy-2,3,4,5-tetrahydro-1H-1-benzazepin-2-one

Participants

Reaction Conditions

Reaction Steps

Combined 7-Methoxy-1-tetralone (5.0 g, 0.028 mol) with Polyphosphoric acid (80 g, 0.7 mol) in 2-neck 500 ml Flask fit with overhead mechanical stirrer and septa under nitrogen flow. Sodium azide (2.2 g, 0.034 mol) added portionwise over 5 min and the reaction was heated to 55° C. Continue stirring overnight. The mixture was poured into water and a white precipitate ensued. The mixture was filtered and washed with water then hexane and dried over 60 h. 8-Methoxy-1,3,4,5-tetrahydro-benzo[b]azepin-2-one obtained as a white solid (3.34 g, 62%). MP: 103-104° C.; 1H-NMR (CDCl3, 400 MHz) δ 7.45 (broad s, 1H), 7.13 (d, J=8.3 Hz, 1H), 6.72-6.69 (m, 1H), 6.54 (d, J=2.1 Hz, 1H), 3.81 (s, 3H), 2.76 (t, J=7.2 Hz, 2H), 2.38 (t, J=7.3 Hz, 2H), 2.25-2.18 (m, 2H); LC/MS: 192.07 (M+H).

Provenance & Evidence