反应 #8586

反应方程式

triethylamine

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

trifluoroacetic anhydride

→

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

收率 68.3%

溶剂

1,2-dimethoxyethane

1,2-dimethoxyethane

反应条件

后处理

1. 1
   其他the temperature below 10° C
2. 2
   workup.ADDITIONAfter the addition
3. 3
   温度The solution was then cooled to 4° C.
4. 4
   温度After warming to room temperature
5. 5
   温度the reaction was heated
6. 6
   温度to reflux for 3 hours
7. 7
   浓缩The reaction was concentrated
8. 8
   其他the resulting solid was recrystallized from ethyl acetate-hexanes

实验过程

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.

来源