[Cl:1][C:2]1[N:7]=[C:6]([CH2:8][C:9]([C:11]2[CH:16]=[CH:15][C:14]([F:17])=[CH:13][CH:12]=2)=[O:10])[CH:5]=[CH:4][N:3]=1.CO[CH:20](OC)[N:21]([CH3:23])[CH3:22]>>[Cl:1][C:2]1[N:7]=[C:6](/[C:8](=[CH:20]\[N:21]([CH3:23])[CH3:22])/[C:9]([C:11]2[CH:16]=[CH:15][C:14]([F:17])=[CH:13][CH:12]=2)=[O:10])[CH:5]=[CH:4][N:3]=1A mixture of the compound prepared in step 2 (4.7 g, 0.017 mol) in 100 mL of dimethylformamide dimethyl acetal was stirred at room temperature overnight. Excess dimethylformamide dimethyl acetal was removed under vacuum to give 4.5 g of crude product as a thick brown oil, which was used without further purification.
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