Sulfuric Acid → 7-Hydroxy-1,2,4,5-tetrahydro-benzo[d]azepine-3-carboxylic acid ethyl ester

Participants

Reaction Conditions

Reaction Steps

Into a 250 ml flask, the product from step (b) (3 g, 12.82 mmol) dissolved in water (15 ml) and concentrated H2SO4 (1.02 ml, 19.23 mmol) was added The reaction mixture was heated to 70° C. and stirred for 15 minutes. A solution of NaNO2 (1.01 g, 14.74 mmol) in water (30 ml) was quickly added, followed by addition of THF (45 ml). The reaction mixture was stirred at 70° C. for 30 minutes and then allowed to cool to room temperature. The reaction mixture was extracted with EtOAc (3×). The combined EtOAc extracts were washed with brine, dried over Na2SO4, and solvent evaporated in vacuo to give the sub-title compound as a yellow solid (2.0 g) that was used without further purification. MS: ESI (positive): 236 (M+H).

Provenance & Evidence