[CH3:1][O:2][C:3]1[CH:12]=[CH:11][C:6]2[C:7](=[O:10])[CH2:8][O:9][C:5]=2[C:4]=1[CH2:13][N:14]1[CH2:19][CH2:18][O:17][CH2:16][CH2:15]1.[NH:20]1[C:28]2[C:23](=[CH:24][CH:25]=[CH:26][CH:27]=2)[C:22]([CH:29]=O)=[N:21]1.N1CCCCC1>CO>[NH:20]1[C:28]2[C:23](=[CH:24][CH:25]=[CH:26][CH:27]=2)[C:22](/[CH:29]=[C:8]2\[O:9][C:5]3[C:4]([CH2:13][N:14]4[CH2:19][CH2:18][O:17][CH2:16][CH2:15]4)=[C:3]([O:2][CH3:1])[CH:12]=[CH:11][C:6]=3[C:7]\2=[O:10])=[N:21]1A solution of 6-methoxy-7-(morpholinomethyl)benzofuran-3(2H)-one (0.131 g, 0.500 mmol) in methanol (2 mL) was added with 1H-indazole-3-carboxaldehyde (0.0877 g, 0.600 mmol) and piperidine (0.00425 g, 0.0500 mmol), and the mixture was stirred at 60° C. for 2 hours. The reaction mixture was concentrated, and the resulting residue was subjected to silica gel column chromatography (chloroform/methanol), and the resulting crude product was crystallized from ethyl acetate. The precipitated solid was collected by filtration, and then suspended in acetonitrile and thereby washed to obtain the objective (Z)-2-[(1H-indazol-3-yl)methylene]-6-methoxy-7-(morpholinomethyl)benzofuran-3(2H)-one (0.0238 g). Further, the filtrate was concentrated, and the resulting residue was purified again by silica gel column chromatography (chloroform/methanol) to obtain the objective (Z)-2-[(1H-indazol-3-yl)methylene]-6-methoxy-7-(morpholinomethyl)benzofuran-3(2H)-one (0.0254 g) (0.0492 g, 25% in total).
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