To a solution of tert-butyl 2-aminoethylcarbamate (481 mg) in dehydrated chloroform (3 ml) were added sodium carbonate (212 mg) and (3-bromopropyl)tritylamine (694 mg), and the mixture was stirred under reflux for 3.5 hours. To the reaction mixture were added diethyl ether and hexane, and the solution was washed with water. The mixture was extracted with 5% aqueous citric acid solution, and the aqueous layer was washed with diethyl ether. The aqueous solution was then made alkaline with sodium hydrogencarbonate followed by extraction with diethyl ether. The organic layer was washed with brine, dried over anhydrous sodium sulfate, filtered and concentrated in vacuo to give tert-butyl 2-{[3-(tritylamino)propyl]amino}ethylcarbamate (410 mg) as a viscous oil.
