[OH:1][CH2:2][CH2:3][CH2:4][N:5]([CH3:13])[C:6](=[O:12])[O:7][C:8]([CH3:11])([CH3:10])[CH3:9].C(N(CC)CC)C.C(=O)([O-])O.[Na+].[CH3:26][S:27](Cl)(=[O:29])=[O:28]>C(OCC)(=O)C>[CH3:26][S:27]([O:1][CH2:2][CH2:3][CH2:4][N:5]([C:6]([O:7][C:8]([CH3:10])([CH3:9])[CH3:11])=[O:12])[CH3:13])(=[O:29])=[O:28]To a solution of tert-butyl N-(3-hydroxypropyl)-N-methylcarbamate (12.0 g) and triethylamine (11.5 ml) in ethyl acetate (300 ml), methanesulfonyl chloride (5.4 ml) was added under cooling with ice. After 2 hours' stirring, saturated aqueous sodium hydrogencarbonate solution was added to the reaction liquid and extracted with ethyl acetate. The organic layer was washed with saturated brine, dried over anhydrous sodium sulfate and condensed under reduced pressure to provide 3-[(tert-butoxycarbonyl)-(methyl)amino]propyl methanesulfonate (14.8 g) as an oily substance.
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