6-Bromo-3-pyridinecarboxaldehyde → 5-Formylpyridine-2-carbonitrile
反応式
Br[C:2]1[CH:7]=[CH:6][C:5]([CH:8]=[O:9])=[CH:4][N:3]=1.[Cu][C:11]#[N:12]>CN(C=O)C>[CH:8]([C:5]1[CH:6]=[CH:7][C:2]([C:11]#[N:12])=[N:3][CH:4]=1)=[O:9]参加物
4
反応条件
- 温度
- 120 °C
実験手順
A suspension of 2-bromo-5-formylpyridine (940 mg, 5.05 mmol) and copper (I) cyanide (233 μL, 7.58 mmol) in DMF (8.4 mL) was stirred at 120° C. for 1.5 hours, cooled to RT, and partitioned between water and EtOAc. The solids were removed from the aqueous layer by filtration, and the filtrate was extracted with ethyl acetate. The combined organic layers were washed with brine, dried over anhydrous magnesium sulfate, filtered and concentrated. The crude product was purified by silica-gel chromatography, eluting with a gradient of 40%-60% (40% ethyl acetate in heptane) in heptane, to provide the title compound (236 mg, 1.786 mmol) as white solid. LC/MS (ESI+) m/z=133 (M+H).