[Si:1]([O:8][C@H:9]1[CH2:13][N:12]([C:14]([O:16][C:17]([CH3:20])([CH3:19])[CH3:18])=[O:15])[C@H:11]([CH2:21]OS(C)(=O)=O)[CH2:10]1)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].[H-].[Al+3].[Li+].[H-].[H-].[H-].O.[OH-].[Na+]>O1CCCC1>[Si:1]([O:8][C@H:9]1[CH2:13][N:12]([C:14]([O:16][C:17]([CH3:20])([CH3:19])[CH3:18])=[O:15])[C@H:11]([CH3:21])[CH2:10]1)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2]To a solution of (2S,4R)-4-(tert-butyldimethylsilyloxy)-1-(tert-butoxycarbonyl)-2-methanesulfonyloxymethylpyrrolidine (6.0 g) in tetrahydrofuran (60 ml) was added slowly lithium aluminum hydride (1.11 g) at 0° C. And then, the reaction mixture was allowed to warm to 40° C. and stirred for one hour. To the reaction mixture were added dropwise water (1.11 ml), 4N-aqueous sodium hydroxide (1.11 ml) and water (3.33 ml). The precipitate was filtered off, and the solvent was removed in vacuo to give (2R,4R)-4-(tert-butyldimethylsilyloxy)-1-(tert-butoxycarbonyl)-2-methylpyrrolidine (4.0 g).
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