反应详情

To 10 ml of anhydrous tetrahydrofuran was added 0.34 g (0.0085 mole) of a 60% sodium hydride-mineral oil, and while stirring the mixture at 45° to 50° C., 1.21 g (0.0085 mole) of methyl iodide was added thereto. To the mixture was added dropwise a solution of 2.37 g of 1-t-butoxycarbonyl-3-hydroxy-4-phenylaminopyrrolidine obtained in Reference example 17 (1) dissolved in 10 ml of anhydrous tetrahydrofuran, and the mixture was further stirred at the same temperature for 1 hour. After the mixture was cooled to room temperature, the solvent was removed under reduced pressure, and the residue was spplied to silica gel column chromatography (the eluent used was a mixture of methyl acetate:toluene=1:4) to obtain 1.98 g of 1-t-butoxycarbonyl-3-methoxy-4-phenylaminopyrrolidine as white crystals.

1. stirringthe mixture was further stirred at the same temperature for 1 hour
2. customthe solvent was removed under reduced pressure
3. additiona mixture of methyl acetate