[CH3:1][O:2][C:3]1[CH:10]=[CH:9][C:6]([CH:7]=[O:8])=[CH:5][C:4]=1Br.C(=O)([O-])[O-].[Na+].[Na+].[S:18]1[CH:22]=[CH:21][CH:20]=[C:19]1B(O)O>C1(C)C=CC=CC=1.C(O)C.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH3:1][O:2][C:3]1[CH:10]=[CH:9][C:6]([CH:7]=[O:8])=[CH:5][C:4]=1[C:19]1[S:18][CH:22]=[CH:21][CH:20]=1Tetrakis(triphenylphosphine)palladium(0) (0.24 g, 0.21 mmol) was added to a solution of 4-methoxy-3-bromobenzaldehyde (1.5 g, 6.98 mmol) in toluene (15 mL) and ethanol (15 mL), followed by a 2 M aqueous solution of sodium carbonate (14 mL, 28 mmol). To this mixture was added thiophene-2-boronic acid (0.98 g, 7.68 mmol), and the mixture was heated to reflux. After 3 hours, the reaction was partitioned between water (100 mL) and ethyl acetate (250 mL). The organic layer was washed with saturated aqueous sodium bicarbonate (75 mL) and brine (75 mL), dried with magnesium sulfate and concentrated. Chromatography (silica, 20% ethyl acetate/hexanes) afforded 1.3 g (87%) of 4-methoxy-3-thiophen-2-yl-benzaldehyde as a yellow oil.
読み込み中…
