[Cl:1][C:2]1[C:7]2[C:8](=[O:21])[N:9](C(C)(C3C=CC=CC=3)C)[CH:10](O)[C:6]=2[CH:5]=[C:4]([CH3:22])[N:3]=1.FC(F)(F)C(O)=O.C([SiH](CC)CC)C>[N+](C)([O-])=O>[Cl:1][C:2]1[C:7]2[C:8](=[O:21])[NH:9][CH2:10][C:6]=2[CH:5]=[C:4]([CH3:22])[N:3]=1In a similar manner to Step 4 of Example 16, 4-chloro-1-hydroxy-6-methyl-2-(1-methyl-1-phenylethyl)-1,2-dihydropyrrolo[3,4-c]pyridine-3-one (70.0 mg, 0.220 mmol) was dissolved in nitromethane (3.5 mL), and the solution was treated with trifluoroacetic acid (0.509 mL, 6.60 mmol) and triethylsilane (0.141 mL, 0.880 mmol), followed by purification by slurry using isopropylether/hexane to obtain 4-chloro-6-methyl-1,2-dihydropyrrolo[3,4-c]pyridine-3-one (25.5 mg, yield 63%).
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