[OH:1][C@@H:2]1[CH2:7][N:6]([C:8]([O:10][CH2:11][C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=2)=[O:9])[C@H:5]([CH3:18])[CH2:4][CH2:3]1.C[N+]1([O-])CCOCC1>C(Cl)Cl.[Ru]([O-])(=O)(=O)=O.C([N+](CCC)(CCC)CCC)CC>[CH3:18][C@@H:5]1[CH2:4][CH2:3][C:2](=[O:1])[CH2:7][N:6]1[C:8]([O:10][CH2:11][C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1)=[O:9]Benzyl (2R,5S)-5-hydroxy-2-methylpiperidine-1-carboxylate (6.8 g, 27.3 mmol) was dissolved in DCM (100 mL) containing crushed molecular sieves. N-methylmorpholine N-oxide (4.15 g, 35.5 mmol) and tetrapropylammonium perruthenate (0.48 g, 1.36 mmol) were added, and the reaction was stirred at room temperature for 1.5 hours. The mixture was filtered through a celite pad and concentrated. The residue was purified by silica gel chromatography (0-30% ethyl acetate/hexanes, linear gradient) to afford benzyl (2R)-2-methyl-5-oxopiperidine-1-carboxylate. MS ESI calc'd. for C14H17NO3 [M+H]+ 248. found 248.
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