반응 #7224

반응 방정식

2-Bromo-3-but-3-enyloxy-pyridine

triphenylphosphine

potassium acetate

→

title compound

수율 52.8%

4-Methylene-3,4-dihydro-2H-pyrano[3,2-b]pyridine

수율 52.8%

반응 조건

후처리

1. 1
   기타degassed DMF (2 mL)
2. 2
   기타to seal the tube
3. 3
   기타the contents were then flushed several times with argon
4. 4
   기타closed tightly with a cap
5. 5
   온도cooled to room temperature
6. 6
   workup.ADDITIONthen diluted with 200 mL ethyl acetate
7. 7
   세척The organic layer was washed with sat. NaHCO3
8. 8
   건조brine and dried over Na2SO4
9. 9
   기타Evaporation of the solvent and purification of the residue by flash chromatography on silica gel

실험 절차

A reaction tube was charged with 2-Bromo-3-but-3-enyloxy-pyridine (106 mg, 0.45 mmol), triphenylphosphine (35 mg, 0.133 mmol), palladium acetate (10 mg, 0.044 mmol), potassium acetate (223 mg, 2.27 mmol), tetraethylammonium chloride hydrate (151 mg, 0.91 mmol) and degassed DMF (2 mL). A rubber septum was used to seal the tube and the contents were then flushed several times with argon, then closed tightly with a cap. The mixture was heated at 110° C. under argon for 18 hours, cooled to room temperature then diluted with 200 mL ethyl acetate. The organic layer was washed with sat. NaHCO3, then brine and dried over Na2SO4. Evaporation of the solvent and purification of the residue by flash chromatography on silica gel, using 5% ethyl acetate in hexanes, afforded the title compound (35 mg, 52%) as white solid. 1H NMR (CDCl3) □ 2.79–2.84 (m, 2H), 4.25 (t, 2H, J=5.7 Hz), 5.06–5.08 (m, 1H), 6.19 (d, 1H, J=1.6 Hz), 7.08–7.17 (m, 2H), 8.20 (dd, 1H, J=1.6, 4.7 Hz); ES-MS m/z 148.0 (M+H).

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