[CH3:1][O:2][C:3]1[N:8]=[C:7]2[C:9]([CH3:23])([CH3:22])[N:10](CC3C=CC(OC)=CC=3)[C:11](=[O:12])[C:6]2=[CH:5][CH:4]=1.[N+]([O-])([O-])=O.[NH4+].O.[CH3:30]COC(C)=O>CC#N>[CH2:1]([O:2][C:3]1[N:8]=[C:7]2[C:9]([CH3:23])([CH3:22])[NH:10][C:11](=[O:12])[C:6]2=[CH:5][CH:4]=1)[CH3:30]To solution of 2-methoxy-6-(4-methoxy-benzyl)-7,7-dimethyl-6,7-dihydro-pyrrolo[3,4-b]pyridin-5-one (0.33 g, 1.0 mmol) in CH3CN (5 mL) was added eerie ammonium nitrate (1.64 g, 3.0 mmol) at room temperature. The reaction mixture was stirred at room temperature for 3 hours before water and EtOAc were added into the mixture. The organic layer was separated, dried over anhy. Na2SO4, filtered and concentrated in vacuo to give a crude product which was then purified by silica gel column chromatography to give the title compound (0.15 g, 72%) as a solid. MS: 207.1 (M+H+).
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