Br[C:2]1[C:9]([CH3:10])=[CH:8][C:5]([C:6]#[N:7])=[C:4]([F:11])[CH:3]=1.C(OC)(=O)[CH2:13][C:14]([O:16][CH3:17])=[O:15].C(=O)([O-])[O-].[K+].[K+].C(=O)([O-])O.[K+]>C(OCC)(=O)C.F[B-](F)(F)F.C([PH+](C(C)(C)C)C(C)(C)C)(C)(C)C>[C:6]([C:5]1[C:4]([F:11])=[CH:3][C:2]([CH2:13][C:14]([O:16][CH3:17])=[O:15])=[C:9]([CH3:10])[CH:8]=1)#[N:7]Combined 4-bromo-2-fluoro-5-methylbenzonitrile (4 g, 18.69 mmol) and dimethyl malonate (29.9 mL, 262 mmol). While purging the mixture with nitrogen, added potassium carbonate (3.87 g, 28.0 mmol), potassium hydrogencarbonate (2.81 g, 28.0 mmol), tri-tert-butylphosphonium tetrafluoroborate (0.119 g, 0.411 mmol), and bis(dibenzylidineacetone)palladium (0) (0.118 g, 0.206 mmol). The reaction mixture was heated in an oil bath at 170° C. for 3 hours, then cooled, diluted with ethyl acetate, and filtered through Celite®. The filtrate was concentrated and the residue dissolved in EtOAc, extracted with 1M aqueous sodium hydroxide (2×), twice with 10% aqueous sodium chloride, and brine. The organic phase was dried over sodium sulfate, filtered, and concentrated in vacuo, then purified by flash chromatography to give the title compound (1.67 g, 43%) as a clear colorless oil. 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 2.30 (s, 3 H) 3.67 (s, 2 H) 3.72 (s, 3 H) 7.10 (d, J=9.60 Hz, 1 H) 7.42 (d, J=6.32 Hz, 1 H).
読み込み中…
