Sodium → 7-Methoxy-2,3,4,5-tetrahydro-1h-3-benzazepine

Participants

Reaction Steps

7-Methoxy-3-(toluene-4-sulfonyl)-2,3,4,5-tetrahydro-1H-benzo[d]azepine (3.9 g/11.8 mmol) was placed in a round bottom flask and cooled to −78 C (external CO2/acetone bath). Ammonia (ca. 20 mL) was condensed into the flask and freshly cut sodium (3 g) was carefully added in small pieces (dark blue color observed) and the reaction allowed to stir for one hour. The reaction was quenched by the addition of solid ammonium chloride followed by careful addition of diethyl ether (30 mL). The reaction was then allowed to warm to room temperature and the ammonia allowed to boil off. Water was then carefully added (50 mL) and the layers separated. The organic layer was extracted with 1 N hydrochloric acid (2×50 mL). The aqueous extracts were basified with 33% aqueous sodium hydroxide and extracted with 10% methanol/methylene chloride (3×50 mL). The combined organic extracts were dried (magnesium sulfate), filtered and concentrated to afford 7-Methoxy-2,3,4,5-tetrahydro-1H-benzo[d]azepine as a colorless oil (1.7 g/81%). 1H NMR (400 MHz, CDCl3) δ 7.02 (d, J=8.0 Hz, 1H), 6.68-6.61 (m, 2H), 3.81 (s, 3 H), 2.99-2.82 (m, 8H).

Provenance & Evidence