反应详情

2-Chloro-6-bromobenzaldehyde (200 mg, 0.91 mmol), pyridine-4-boronic acid (125 mg, 1.0 mmol), dichlorobis(triphenylphosphine)palladium (II) (5 mol %, 30 mg), acetonitrile (2 mL) and aqueous sodium carbonate (2 molar solution, 2 mL) were combined in a microwave vial and sealed with a crimp seal. The mixture was microwaved at 150° C. for 5 min. The crude reaction mixture was then poured over Celite and washed with acetonitrile. The mixture was concentrated under reduced pressure and taken up in ethyl acetate. This organic solution was successively washed with water and brine, then dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The resulting residue was purified by flash column chromatography on silica gel, eluting with 98:2 methylene chloride:methanol to provide 2-chloro-6-(4-pyridyl)benzaldehyde (100 mg, 51% yield). NMR (300 MHz, CDCl3): 10.3 (s, 1H), 8.65 (m, 2H), 7.55 (m, 2H), 7.2 ppm (m, 3H).

1. customsealed with a crimp
2. customseal
3. customThe mixture was microwaved at 150° C. for 5 min
4. customThe crude reaction mixture
5. additionwas then poured over Celite
6. washwashed with acetonitrile
7. concentrationThe mixture was concentrated under reduced pressure
8. washThis organic solution was successively washed with water and brine
9. dry with materialdried over anhydrous sodium sulfate
10. filtrationfiltered
11. concentrationconcentrated under reduced pressure
12. customThe resulting residue was purified by flash column chromatography on silica gel
13. washeluting with 98:2 methylene chloride