反应 #1964662

反应方程式

[2-trifluoromethylpyridin-5-yl]boronic acid

caesium carbonate

dichloromethane

4-trifluoromethanesulphonyloxycarbazole

→

4-[6-(trifluoromethyl)pyridin-3-yl]-9H-carbazole

收率 49.6%

溶剂

dioxane

water

反应条件

后处理

1. 1
   温度The reaction mixture is refluxed for 5 hours
2. 2
   过滤filtered through celite and
3. 3
   浓缩concentrated under reduced pressure
4. 4
   其他The residue is subsequently purified by silica gel chromatography, elution
5. 5
   workup.ADDITIONbeing carried out with a mixture of cyclohexane and ethyl acetate (85/15 by volume) so as

实验过程

0.96 g of [2-trifluoromethylpyridin-5-yl]boronic acid, 4.55 g of caesium carbonate and 0.13 g of 1,1′-bis(diphenylphosphino)ferrocenepalladium(II) dichloride as a complex with dichloromethane (1/1) [PdCl2(dppf).CH2Cl2] are successively added, under argon, to a solution of 1.1 g of 4-trifluoromethanesulphonyloxycarbazole, obtained in stage 1 of Example 1, in a mixture of 50 ml of dioxane and 17 ml of water. The reaction mixture is refluxed for 5 hours, filtered through celite and concentrated under reduced pressure. The residue is subsequently purified by silica gel chromatography, elution being carried out with a mixture of cyclohexane and ethyl acetate (85/15 by volume) so as to give 0.54 g of 4-[6-(trifluoromethyl)pyridin-3-yl]-9H-carbazole in the form of a pale yellow oil, the characteristics of which are the following:

来源