Pyridine → HCID 59003137, compound

Participants

Reaction Conditions

Reaction Steps

Add 3,5-bis(trifluoromethyl)benzylamine (1.49 g, 6.13 mmol) followed by titanium isopropoxide (1.60 mL, 5.47 mmol) to a solution of tert-butyl 8-bromo-5-oxo-2,3,4,5-tetrahydro benzo[b]azepine-1-carboxylate (1.49 g, 4.38 mmol) in tetrahydrofuran (17.5 mL) at room temperature under nitrogen and stir the solution for 14 h. Dilute the reaction with methanol (35 mL) and slowly add sodium borohydride (0.248 g, 6.57 mmol) to the reaction and stir at room temperature for 3 h. Add 2 N NaOH (20 mL) and water (20 mL) to the reaction and stir for 0.5 h. Filter the mixture and wash the solids with ethyl acetate (3×75 mL). Separate the filtrate and wash the organic layer with brine (25 mL), then dry the solution over sodium sulfate, filter and remove the solvent under reduced pressure to afford tert-butyl 5-(3,5-bistrifluoromethylbenzylamino)-8-bromo-2,3,4,5-tetrahydrobenzo[b]azepine-1-carboxylate as a white solid. Add acetic anhydride (6.0 mL, 64.0 mmol) dropwise to a suspension of tert-butyl 5-(3,5-bistrifluoromethylbenzylamino)-8-bromo-2,3,4,5-tetrahydrobenzo[b]azepine-1-carboxylate (2.42 g, 4.26 mmol) and pyridine (5.2 mL, 64.0 mmol) in dichloromethane (17 mL) under nitrogen cooled to 0° C. After the addition is complete, remove the cooling bath and warm the reaction to room temperature and stir for 12 h. Dilute the mixture with dichloromethane (25 mL) and wash with 2 M potassium hydrogen sulfate and saturated aqueous sodium bicarbonate (25 mL each). Dry the organic layer over sodium sulfate, filter and remove the solvent under reduced pressure. Purify the residue using chromatography on silica gel, eluting with hexanes/ethyl acetate (60:40), to afford the title compound as a white solid.

Provenance & Evidence