CO[CH:3]=[C:4]1[C:13]2[C:8](=[CH:9][CH:10]=[CH:11][CH:12]=2)[C:7](=[O:14])[NH:6][C:5]1=[O:15].[OH:16][C:17]1[CH:18]=[C:19]([CH:21]=[CH:22][C:23]=1[OH:24])[NH2:20]>CN(C)C=O>[OH:16][C:17]1[CH:18]=[C:19]([NH:20][CH:3]=[C:4]2[C:13]3[C:8](=[CH:9][CH:10]=[CH:11][CH:12]=3)[C:7](=[O:14])[NH:6][C:5]2=[O:15])[CH:21]=[CH:22][C:23]=1[OH:24]To a suspension of 4-Methoxymethylene-4H-isoquinoline-1,3-dione (40.6 mg, 0.2 mmol) in N,N-dimethylformamide (0.5 mL) is added 3,4-dihydroxyaniline (25 mg, 0.2 mmol). The reaction mixture is shaken at 115° C. for 1.5 hours. The reaction mixture is diluted to 2 mL with N,N-dimethylformamide and purified by C18 reverse phase HPLC. The pure fractions were combined and concentrated to yield the title compound (15.6 mg).
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