[Cl:1][C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][CH:10]=1)[NH:7][C:6](=[O:11])[CH2:5]2.[N:12]1[CH:17]=[CH:16][CH:15]=[CH:14][C:13]=1[CH:18]=O>N1CCCCC1.C(O)C>[Cl:1][C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][CH:10]=1)[NH:7][C:6](=[O:11])[C:5]2=[CH:18][C:13]1[CH:14]=[CH:15][CH:16]=[CH:17][N:12]=1A 5 mL of ethanol solution containing 5-chlorooxindole (167 mg, 1 mmol), 2-pyridine-carboxaldehyde (129 mg, 1.2 mmol) and 3 drops of piperidine was stirred at 80° C. for 6 hours. After cooling the solution to 5° C., yellow precipitate was obtained (200 mg, 78%). MS: m/z 257 [M+1]+.
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