Hydrogen Bromide → 4-(1-(5-(2-Bromoacetyl)-4-cyclobutyl-2-methylbenzoyl)piperidin-4-yl)benzonitrile

Participants

Reaction Conditions

Reaction Steps

To a solution of TMSCHN2 (2 M in hexane) (0.476 mL, 2.00 equiv) in dichloromethane (10 mL) under nitrogen at 0° C. was added dropwise a solution of 5-(4-(4-cyanophenyl)piperidine-1-carbonyl)-2-cyclobutyl-4-methylbenzoyl chloride (compound 235.1, 200 mg, 0.480 mmol, 1.00 equiv) in dichloromethane (3 mL). The resulting mixture was stirred overnight at 25° C. HBr (40%) (0.154 mL, 1.50 equiv) was then added dropwise at 0° C. and the mixture was stirred for another 2 h at 0° C., then diluted with 50 mL of dichloromethane. The organic layer was washed with 2×20 mL of water and 1×20 mL of brine, dried over anhydrous sodium sulfate and concentrated in vacuo. The residue was purified using silica gel column chromatography with ethyl acetate/petroleum ether (0:1-1:50-1:5) as eluent to furnish 200 mg (88%) of 4-(1-(5-(2-bromoacetyl)-4-cyclobutyl-2-methylbenzoyl)piperidin-4-yl)benzonitrile as a yellow oil.

Provenance & Evidence