Methanol → 5,5-Dimethyl-7-nitro-2,3,4,5-tetrahydro-1H-benzo[b]azepine

Participants

Reaction Steps

Combined 5,5-Dimethyl-7-nitro-1,3,4,5-tetrahydrobenzo[b]azepin-2-one (89 mg, 0.38 mmol), Borane-THF complex, 1M in THF (1.9 mL, 1.9 mmol) and 3 mL anhydrous THF. Heated reaction to reflux for 1 hour. Let reaction cool to room temperature, added methanol and concentrated under reduced pressure. Dissolved residue in methylene chloride and washed with saturated sodium bicarbonate solution. Purified with normal phase chromatography eluting with 10% ethyl acetate in hexane to yield a yellow solid, 5,5-Dimethyl-7-nitro-2,3,4,5-tetrahydro-1H-benzo[b]azepine (60 mg, 72%). mp 99° C.; LCMS: m/z=221.06 (M+H+), 1H NMR (400 MHz, CDCl3) δ 8.26 (d, 1H, J=2.3 Hz), 7.91 (dd, 1H, J=8.6, 2.5 Hz), 6.68 (d, 1H, J=8.8 Hz), 4.28 (br s, 1H), 3.16 (m, 2H), 1.91 (m, 2H), 1.72 (m, 2H), 1.41 (s, 6H).

Provenance & Evidence