Dimethylformamide → tert-butyl (3R)-3-(2-fluoroethoxy)pyrrolidine-1-carboxylate

참여 물질

반응 단계

Sodium hydride (55% oiliness, 140 mg, 3.2 mmols) was added to DMF (5 mL) solution of tert-butyl (3R)-3-hydroxypyrrolidine-1-carboxylate (501.2 mg, 2.7 mmols) and stirred at room temperature for 30 minutes, followed by addition of 2-fluoroethyl p-toluenesulfonate (1.17 g, 5.4 mmols) and further 24 hours' stirring at the same temperature. Ethyl acetate was added to the reaction liquid which then was washed with saturated aqueous sodium hydrogencarbonate solution, water and saturated brine, and dried over anhydrous magnesium sulfate. Concentrating the solvent under reduced pressure, the residue was purified on silica gel column chromatography (KP-Sil Sil FLASH 25+M, ethyl acetate:hexane=1:10→2:8) to provide the title compound (253 mg, 41%).

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