[F:1][C:2]1[CH:3]=[C:4]([C:8]2[N:13]=[N:12][C:11]([NH:14][NH2:15])=[CH:10][CH:9]=2)[CH:5]=[CH:6][CH:7]=1.[Cl:16][CH2:17][C:18](Cl)=O>>[Cl:16][CH2:17][C:18]1[N:12]2[N:13]=[C:8]([C:4]3[CH:5]=[CH:6][CH:7]=[C:2]([F:1])[CH:3]=3)[CH:9]=[CH:10][C:11]2=[N:14][N:15]=1As for Example 2, 6-(3-fluorophenyl)-3-hydrazinopyridazine (prepared in a manner similar to that described in Example 1) is reacted with chloroacetyl chloride to give the product of the Example.
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