[CH3:1][N:2]1[CH:6]=[CH:5][N:4]=[C:3]1[C:7]([OH:9])=O.[NH2:10][C:11]1[CH:19]=[C:18]2[C:14]([C:15]([CH3:23])([CH3:22])[C:16](=[O:21])[N:17]2[CH3:20])=[CH:13][CH:12]=1.CN(C(ON1N=NC2C=CC=NC1=2)=[N+](C)C)C.F[P-](F)(F)(F)(F)F.CCN(C(C)C)C(C)C.C(=O)([O-])[O-].[Na+].[Na+]>CN(C=O)C.C(OCC)(=O)C>[CH3:1][N:2]1[CH:6]=[CH:5][N:4]=[C:3]1[C:7]([NH:10][C:11]1[CH:19]=[C:18]2[C:14]([C:15]([CH3:23])([CH3:22])[C:16](=[O:21])[N:17]2[CH3:20])=[CH:13][CH:12]=1)=[O:9]To a solution of 1-methyl-1H-imidazole-2-carboxylic acid (99.4 mg, 788 μmol) and 6-amino-1,3,3-trimethylindolin-2-one (100 mg, 526 μmol) in DMF (3 ml) were added HATU (400 mg, 1.05 mmol) and DIPEA (347 mg, 468 μl, 2.63 mmol). The reaction mixture was stirred for 3 hours at room temperature and then poured into ethyl acetate and 1 M aqueous sodium carbonate solution. The aqueous phase was extracted with ethyl acetate. The combined organic layers were dried over sodium sulfate and the solvent was removed under reduced pressure. The crude material was purified by silica gel chromatography using ethyl acetate/heptane as eluent followed by reversed phase preparative HPLC. The title compound was obtained as off-white crystals (135 mg).
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