[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][CH:11]([CH:14]([OH:23])[C:15]2[CH:20]=[CH:19][C:18]([O:21][CH3:22])=[CH:17][CH:16]=2)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].C1C=C[NH+]=CC=1.[O-][Cr](Cl)(=O)=O>C(Cl)Cl>[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][CH:11]([C:14](=[O:23])[C:15]2[CH:16]=[CH:17][C:18]([O:21][CH3:22])=[CH:19][CH:20]=2)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2]To a solution of the above alcohol (3.40 g, 10.6 mmol) in CH2Cl2 (50 mL) at room temperature was added SiO2 (13.60 g) and PCC (6.84 g, 31.70 mmol). The resulting mixture was stirred under N2 for 2 hours to afford 4-(4-methoxy-benzoyl)-piperidine-1-carboxylic acid tert-butyl ester as a yellow solid (3.00 g, 88%) after purification.
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