[Si:1]([O:8][C@H:9]1[CH2:14][NH:13][CH2:12][C@H:11]([OH:15])[CH2:10]1)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].[CH3:16][CH2:17][O:18][C:19](C)=[O:20]>O1CCOCC1.O>[Si:1]([O:8][C@@H:9]1[CH2:10][C@@H:11]([OH:15])[CH2:12][N:13]([C:19]([O:18][CH2:17][C:16]2[CH:12]=[CH:11][CH:10]=[CH:9][CH:14]=2)=[O:20])[CH2:14]1)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2]To a solution of (3R,5R)-5-(tert-butyldimethylsilyloxy)piperidin-3-ol (1 eq) in 20 mL of 1,4-dioxane and 8 mL of water was added benzyl chloro formate (1.5 eq). The mixture was stirred at room temperature for 4 hours. The crude mixture was diluted with 100 mL of EtOAc, washed with brine, then dried over anhydrous MgSO4, filtered, and concentrated in vacuo. The crude residue was purified by flash chromatography (EtOAc:hexanes=1:3) to yield (3R,5R)-benzyl 3-(tert-butyldimethylsilyloxy)-5-hydroxypiperidine-1-carboxylate (74%). LC/MS (m/z): 366.2 (MH+).
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