1-Hydroxybenzotriazole → Tert-butyl 4-[2-(3-{[(2-bromoethyl)amino]carbonyl}phenyl)ethyl]piperidine-1-carboxylate

Participants

Reaction Steps

A DMF (15 ml) solution of 3-{2-[1-(tert-butoxycarbonyl)-4-piperidinyl]ethyl]benzoic acid (1.25 g), 1-[3-(dimethylamino)propyl]-3-ethylcarbodiimide hydrochloride (863 mg) and 1-hydroxybenzotriazole (608 mg) was stirred at room temperature for 1 hour, and then a TEA (1.6 ml) solution of 2-bromoethylamine hydrobromide (2.30 g) was added thereto, followed by stirring overnight. Aqueous saturated sodium hydrogencarbonate solution was added to the reaction liquid, followed by extraction with EtOAc, then washed with saturated brine, and dried over anhydrous magnesium sulfate, and the solvent was evaporated to obtain a crude product of tert-butyl 4-[2-(3-{[(2-bromoethyl)amino]carbonyl}phenyl)ethyl]piperidine-1-carboxylate.

Provenance & Evidence