[CH3:1][C:2]([C:4]1[CH:9]=[CH:8][C:7]([F:10])=[C:6]([O:11][CH3:12])[CH:5]=1)=O.Cl.[N:14]1[O:15][N:16]=[C:17]2[CH:22]=[C:21]([CH2:23][O:24][NH2:25])[CH:20]=[CH:19][C:18]=12.N1C=CC=CC=1>C(O)C>[N:14]1[O:15][N:16]=[C:17]2[CH:22]=[C:21]([CH2:23][O:24][N:25]=[C:2]([C:4]3[CH:9]=[CH:8][C:7]([F:10])=[C:6]([O:11][CH3:12])[CH:5]=3)[CH3:1])[CH:20]=[CH:19][C:18]=12A solution of 4-fluoro-3-methoxyacetophenone (0.056 g, 0.332 mmol), (benzo[c][1,2,5]oxadiazol-5-yl)methoxyamine hydrochloride (0.072 g, 0.359 mmol) and pyridine (0.10 ml, 1.24 mmol) in ethanol (5 ml) was stirred at reflux under nitrogen for 4 h and cooled to room temperature. The solution was concentrated to a pale yellow oil which was diluted with dichloromethane/water. The resultant mixture was extracted with dichloromethane (×3). The combined organic phases were washed with water and brine, dried over magnesium sulphate, filtered and concentrated to a white solid. The crude product was purified by column chromatography (SiO2), eluting with 9:1 petrol/ethyl acetate, to give a 4′-fluoro-3′-methoxyacetophenone-O-[(benzo[c][1,2,5]oxadiazol-5-yl)methyl]oxime (CP9-129) as a white solid (0.078 g, 74%), m.p. 65°.
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