Triethylamine → tert-butyl N-{2-[2-(methanesulfonyloxy)ethoxy]ethyl}carbamate

Participants

Reaction Steps

Under a nitrogen atmosphere, a solution of tert-butyl 2-(2-hydroxyethoxy)ethylcarbamate (89.0 g, 434 mmol) in dichloromethane (1.5 L) was cooled to 0° C.; triethylamine (90.7 mL, 650 mmol) was added dropwise. Methanesulfonyl chloride (36.9 mL, 477 mmol) was then added over a period of 45 minutes. A precipitate formed, and the reaction became yellow. The reaction was allowed to warm to room temperature and stirred overnight. Saturated aqueous sodium bicarbonate (750 mL) was added. The organic layer was then sequentially washed with water (3×500 mL) and brine (250 mL), dried over magnesium sulfate, filtered, and concentrated under reduced pressure to provide 119.2 g of 2-{2-[(tert-butoxycarbonyl)amino]ethoxy}ethyl methanesulfonate as a light orange oil.

Provenance & Evidence