[Cl:1][C:2]1[CH:3]=[CH:4][C:5]([O:10][CH:11]([CH3:13])[CH3:12])=[C:6]([CH:9]=1)[CH:7]=O.[Cl:14][C:15]1[CH:23]=[C:22]2[C:18]([CH2:19][C:20](=[O:24])[NH:21]2)=[CH:17][CH:16]=1.N1CCCC1>CO>[Cl:14][C:15]1[CH:23]=[C:22]2[C:18](/[C:19](=[CH:7]/[C:6]3[CH:9]=[C:2]([Cl:1])[CH:3]=[CH:4][C:5]=3[O:10][CH:11]([CH3:13])[CH3:12])/[C:20](=[O:24])[NH:21]2)=[CH:17][CH:16]=15-Chloro-2-isopropoxy-benzaldehyde (3 g, 15.1 mmol) and 6-chlorooxindole (2 g, 12.6 mmol) were mixed in anhydrous methanol (30 mL) at room temperature. Then pyrrolidine (1.07 g, 15.1 mmol) was added slowly. The reaction mixture was heated at 70° C. for 3 h. Then the mixture was cooled to room temperature and filtered. The precipitate was dried and collected to give E/Z-6-chloro-3-(5-chloro-2-isopropoxy-benzylidene)-1,3-dihydro-indol-2-one as a yellow solid (3.4 g).
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