反应详情

A solution of 3-phenyl-2-(1H)-pyridone (VIII; 20.0 g, 0.12 mole) and phosphorus oxychloride (300 mL) was refluxed for 6 hr and then slowly poured over crushed ice (300 mL). The resulting solution was made basic with ammonium hydroxide which led to formation of a precipitate. The mixture was extracted with ethyl ether (3×500 mL) and the combined organic extracts were dried (Na2SO4). Concentration in vacuo gave a solid which was recrystallized from ethyl acetate to yield 7.0 g (31%) of 2-chloro-3-phenylpyridine (VI), m.p. 52°-56°.

1. additionslowly poured
2. extractionThe mixture was extracted with ethyl ether (3×500 mL)
3. dry with materialthe combined organic extracts were dried (Na2SO4)
4. concentrationConcentration in vacuo
5. customgave a solid which
6. customwas recrystallized from ethyl acetate