To a 1000 mL three-neck flask was added 34.8 g of tert-butyl (2-(2-(2-hydroxyethoxy)ethoxy)ethyl)carbamate (1.0 eq.), 150 mL of toluene, and 150 mL of THF, 58.2 g of bromoacetic acid (3 eq.), and stirred to mix. The reaction mixture was heated to 4550°C followed by the slow addition of 33.5 g of sodium hydroxide (6 eq.). The reaction was continued at room temperature overnight. The progress of the reaction was monitored by TLC. After completion of the reaction, the solvent was removed by evaporation. The residue was separated by extraction with water and ethyl acetate. The aqueous phase was adjusted to pH 3 with hydrochloric acid and subsequently extracted with dichloromethane. The dichloromethane layers were combined, dried over anhydrous sodium sulfate, filtered and concentrated to give 18 g of 5,8,11-trioxa-2-azatridecanedioic acid 1-tert-butyl ester (BP103a05) as an oil.
![(2-[2-(2-HYDROXY-ETHOXY)-ETHOXY]-ETHYL)-CARBAMIC ACID TERT-BUTYL ESTER](/CAS/GIF/139115-92-7.gif)
