Br[C:2]1[CH:7]=[CH:6][CH:5]=[C:4]([F:8])[CH:3]=1.C(=O)([O-])[O-].[K+].[K+].[CH3:15][O:16][C:17]1[CH:22]=[CH:21][C:20](B(O)O)=[CH:19][CH:18]=1.O>CC(C)=O>[F:8][C:4]1[CH:3]=[C:2]([C:20]2[CH:21]=[CH:22][C:17]([O:16][CH3:15])=[CH:18][CH:19]=2)[CH:7]=[CH:6][CH:5]=11-Bromo-3-fluorobenzene (28.8 g, 0.165 mol), potassium carbonate (50 g, 0.362 mol), 4-methoxybenzene boronic acid (27.6 g, 0.182 mol), water (100 ml) and acetone (300 ml) were placed in 1 L round-bottom three necked flask equipped with condenser, thermometer, mechanical stirrer and nitrogen inlet and outlet. The reaction flask was flushed with nitrogen and minor flow was held during whole reaction time. The mixture was heated up to the boiling point to 40° C. to degas the reaction system and then cooled down and the catalyst palladium acetate (0.1 g) was added. The temperature has increased of few degrees and the solution turned brown. The mixture was refluxed for 6 hours, then was cooled down, poured on cold water and the precipitated gray solid was filtered off. The raw product was recrystallized from ethanol (500 ml). The product (28.9 g) in a form of white crystals was obtained, 88% of theor. yield. The melting point 63-64° C.
Wird geladen…
