Реакция #8586

Уравнение реакции

triethylamine

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

trifluoroacetic anhydride

→

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

Выход 68.3%

Растворители

1,2-dimethoxyethane

1,2-dimethoxyethane

Условия реакции

Обработка

1. 1
   Другоеthe temperature below 10° C
2. 2
   workup.ADDITIONAfter the addition
3. 3
   ТемператураThe solution was then cooled to 4° C.
4. 4
   ТемператураAfter warming to room temperature
5. 5
   Температураthe reaction was heated
6. 6
   Температураto reflux for 3 hours
7. 7
   КонцентрированиеThe reaction was concentrated
8. 8
   Другоеthe resulting solid was recrystallized from ethyl acetate-hexanes

Методика

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.

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