1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → Tert-butyl 3-[(4-{[(3,4-dichlorophenyl)amino]carbonyl}piperazin-1-yl)carbonyl]piperidine-1-carboxylate

Participants

Reaction Steps

To a mixture of N-(3,4-dichlorophenyl)piperazine-1-carboxamide hydrochloride (1.0 g) in dichloromethane (100 mL) was added N,N-di-iso-propylethylamine (0.56 mL) at room temperature. After 10 minutes N-[3-(dimethylamino)propyl]-N′-ethylcarbodiimide (617 mg) was added followed by 1-(tert-butoxycarbonyl)piperidine-3-carboxylic acid (671 mg) and 1-hydroxybenzotriazole (435 mg). The reaction was stirred overnight at room temperature. The reaction mixture was partitioned between dichloromethane and water and the organic layer was washed with brine. The organic extract was dried over magnesium sulfate and evaporated. The residue was purified by silica column chromatography, eluting with a gradient of 0 to 15% ethyl acetate in hexane to give the title compound as a white foam (1.4 g, 99%).

Provenance & Evidence