Oxalyl chloride → HCID 66816452, compound

Participants

Reaction Conditions

Reaction Steps

Oxalyl chloride (0.20 ml, 2.3 mmol) and dimethylformamide (8 μl) were added to a solution of 1-trifluoromethyl-cyclopropanecarboxylic acid (308 mg, 2.00 mmol) in dichloromethane (2.1 ml) at 0° C. The mixture was stirred at 0° C. for 30 minutes and then stirred at room temperature for two hours. The reaction mixture was concentrated under reduced pressure. A solution of the resulting residue in dichloromethane (1.5 ml) was added dropwise to a solution of 4-amino-4-cyanopiperidine-1-carboxylic acid tert-butyl ester (377 mg, 1.67 mmol) and diisopropylethylamine (0.42 ml, 2.4 mmol) in dichloromethane (2.0 ml) over three minutes at 0° C., and the mixture was stirred at room temperature for 13 hours. The reaction mixture was diluted with dichloromethane, and the organic layer was then washed with water, dried over MgSO4 and concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography (hexane/ethyl acetate=3/1→2/1) to give 4-cyano-4-[(1-trifluoromethyl-cyclopropanecarbonyl)-amino]-piperidine-1-carboxylic acid tert-butyl ester as a colorless solid (519 mg, 86%).

Provenance & Evidence