Réaction #8587

Équation de réaction

Boron trifluoride

7-chloro-2-(4-fluorophenyl)pyrazolo[1,5-α]pyridine

acetic anhydride

→

1-[7-chloro-2-(4-fluorophenyl)pyrazolo[1,5-α]pyridin-3-yl]ethanone

Rendement 77.0%

Solvants

toluene

Conditions de réaction

Traitement

1. 1
   Températureto reflux for 3.5 hours
2. 2
   Autrequenched by the dropwise addition of aqueous sodium bicarbonate
3. 3
   workup.ADDITIONEther was added
4. 4
   Lavagethe organic layer was washed with brine
5. 5
   ExtractionThe aqueous layer was extracted with ether
6. 6
   Séchagethe-combined organics were dried over magnesium sulfate
7. 7
   Filtrationfiltered
8. 8
   Concentrationconcentrated
9. 9
   AutreThe residue was purified by recrystallization from ethyl acetate-hexanes

Mode opératoire

To a solution of 7-chloro-2-(4-fluorophenyl)pyrazolo[1,5-α]pyridine (10.0 g, 40.5 mmol) in toluene (225 mL) at room temperature was added acetic anhydride (4.6 mL, 48.6 mmol). Boron trifluoride diethyletherate (5.6 mL, 44.6 mmol) was then added dropwise and the resultant solution was heated to reflux for 3.5 hours. The reaction mixture was cooled to room temperature and quenched by the dropwise addition of aqueous sodium bicarbonate. Ether was added and the organic layer was washed with brine. The aqueous layer was extracted with ether and the-combined organics were dried over magnesium sulfate, filtered and concentrated. The residue was purified by recrystallization from ethyl acetate-hexanes to give 1-[7-chloro-2-(4-fluorophenyl)pyrazolo[1,5-α]pyridin-3-yl]ethanone (9.0 g, 77%) as redish needles.1H NMR (CDCl3): δ 8.41 (d, 1 H), 7.59 (m, 2 H). 7.45 (dd,1 H), 7.26–7.13 (m 3 H), 2.15 (s, 3 H); 19F NMR (CDCl3) δ −112.06; MS m/z 289 (M+1).

Source