Triethylamine → N-[(6S,9R)-6-(2,3-difluorophenyl)-3-(2,2,2-trifluoroethyl)-6,7,8,9-tetrahydro-5H-imidazo[1,2-a]azepin-9-yl]-2,4-dioxo-1,3,8-triazaspiro[4.5]decane-8-carboxamide

Participants

Reaction Conditions

Reaction Steps

Triethylamine (12 μL, 0.087 mmol) was added to a solution of (6S,9R)-6-(2,3-difluorophenyl)-3-(2,2,2-trifluoroethyl)-6,7,8,9-tetrahydro-5H-imidazo[1,2-a]azepin-9-amine (30 mg, 0.087 mmol) and 4-nitrophenyl chloroformate (18 mg, 0.091 mmol) in tetrahydrofuran (1 mL) at 0° C. After 1 h, 1,3,8-triazaspiro[4.5]decane-2,4-dione (15 mg, 0.091 mmol), triethylamine (48 μL, 0.348 mmol) and N,N-dimethylformamide (1 mL) were added and the mixture heated to 40° C. After 18 h, saturated aqueous sodium carbonate was added and the mixture was extracted with dichloromethane. The organic layer was washed with saturated aqueous sodium bicarbonate (3×), saturated brine, dried over sodium sulfate, filtered and concentrated. Purification by silica gel chromatography [100% dichloromethane→88% dichloromethane/methanol] gave the title compound (12 mg). MS 541.1955 (M+1).

Provenance & Evidence