Reaktion #8586

Reaktionsgleichung

triethylamine

2-(6-chloro-2-pyridinyl)-1-(4-fluorophenyl)ethanone oxime

trifluoroacetic anhydride

→

7-chloro-2-(4-fluorophenyl)pyrazolo[1.5-α]pyridine

Ausbeute 68.3%

Lösungsmittel

1,2-dimethoxyethane

1,2-dimethoxyethane

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigethe temperature below 10° C
2. 2
   workup.ADDITIONAfter the addition
3. 3
   TemperaturThe solution was then cooled to 4° C.
4. 4
   TemperaturAfter warming to room temperature
5. 5
   Temperaturthe reaction was heated
6. 6
   Temperaturto reflux for 3 hours
7. 7
   EinengenThe reaction was concentrated
8. 8
   Sonstigethe resulting solid was recrystallized from ethyl acetate-hexanes

Vorschrift

To a solution of 2-(6-chloro-2-pyridinyl)-1-(4-fluorophenyl)ethanone oxime (109.2 g, 414 mmol) in 1,2-dimethoxyethane (500 mL) at 0° C. was added trifluoroacetic anhydride (59 mL, 414 mmol), keeping the temperature below 10° C. After the addition was complete, the reaction was warmed to 15° C. The solution was then cooled to 4° C. and a solution of triethylamine (116 mL, 828 mmol) in 1,2-dimethoxyethane (60 mL) was added over 0.5 hours. After warming to room temperature, the mixture was stirred for 1.5 hours. To this was added iron(II) chloride (0.52 g, 4.1 mmol) and the reaction was heated to reflux for 3 hours. The reaction was concentrated and the resulting solid was recrystallized from ethyl acetate-hexanes to give 7-chloro-2-(4-fluorophenyl)pyrazolo[1.5-α]pyridine (69.7 g. 68%) as off-white needles. 1H NMR (CDCl3): δ 8.03 (m, 2 H), 7.54 (d, 1 H), 7.16 (m, 3 H), 6.93 (d, 1 H), 6.91 (s, 1 H); MS m/z 247 (M+1); mp 156–157° C.

Quelle