2-Bromo-1-fluoro-4-nitrobenzene → 4-Difluoromethoxy-3-(4-nitro-2-bromophenoxy)benzaldehyde

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a solution of 4-(difluoromethoxy)-3-hydroxy benzaldehyde (8.6 g, 0.046 mol) in dimethylsulphoxide (15 mL) was added potassium fluoride (5.36 g, 0.092 mol) at room temperature. Then it was refluxed to 100-120° C. To this 2-bromo-1-fluoro-4-nitrobenzene (20.3 g, 0.093 mol) in dimethylsulphoxide (10 mL) was added dropwise at 100-120° C. The heating was continued for 5 hours. The reaction mixture was poured into the crushed ice and stirred for 1 hour. Then the aqueous layer was decanted. The solid obtained was dissolved in ethyl acetate (500 mL). The organic layer was washed with water (3×200 mL). The organics were dried over sodium sulphate and filtered. The solvents were removed in vacuum to give the crude product. The product was purified by column chromatography by using gradient (0-2) % of ethyl acetate in hexane. The solid obtained was washed with hexane and dried. Yield—66%. 1H-NMR (DMSO-d6) δ: 7.06 (d, 1H), 7.23-7.41-7.59 (t, 1H), 7.67 (d, 1H), 7.82 (d, 1H), 7.96-7.98 (m, 1H), 8.20-8.23 (m, 1H), 8.61 (d, 1H), 9.97 (s, 1H); HPLC (purity): 99.5%; Mass calculated for C14H8BrF2NO5-388.1, observed—388.1; Rf—0.47 (Ethyl acetate:Hexane (3:7).

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