Triethylamine → 2-(Benzyloxycarbonylamino)propyl methanesulfonate

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In tetrahydrofuran (400 ml) were dissolved 46.5 g (222 mmol) of benzyl (2-hydroxy-1-methylethyl)carbamate and 26.96 g (266 mmol) of triethylamine, and a solution of 27.96 g (244 mmol) of methanesulfonyl chloride in tetrahydrofuran was slowly dropped thereinto at 0° C. After the resulting mixture was stirred at room temperature for 5 hours, the triethylamine hydrochloride precipitated was filtered under reduced pressure and washed with ethyl acetate. The filtrate was concentrated under reduced pressure and water was added thereto, followed by three runs of extraction with ethyl acetate. The extract solution was washed with saturated aqueous sodium hydrogencarbonate solution and then saturated aqueous sodium chloride solution, and dried over anhydrous sodium sulfate. The solvent was distilled off and the crude crystals thus obtained were washed twice with a solvent (hexane:ethyl acetate=4:1) to obtain 49.5 g (yield 78%) of 2-(benzyloxycarbonylamino)propyl methanesulfonate.

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