反応 #595379

反応方程式

Tert-butyl 3-bromo-1H-indazole-1-carboxylate

1-(4-methoxybenzyl)-5-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)-1H-tetrazole

Sodium carbonate

→

3-(4-(1-(4-methoxybenzyl)-1H-tetrazol-5-yl)phenyl)-1H-indazole

溶媒

1

1,1,1,3,3,3-hexafluoro-2-(4-(1-(2-(trifluoromethyl)phenylsulfonyl)-1H-indazol-3-yl)phenyl)propan-2-ol

1,4-dioxane

water

water

反応条件

後処理

1. 1
   その他the system was purged with nitrogen
2. 2
   温度the reaction mixture was heated overnight
3. 3
   温度at reflux temperature under a nitrogen atmosphere
4. 4
   抽出extracted with ethyl acetate
5. 5
   洗浄The combined organic phases were washed with brine
6. 6
   乾燥dried over magnesium sulfate
7. 7
   ろ過After filtration the solvent
8. 8
   その他was removed under reduced pressure
9. 9
   その他The residue was purified on SiO2 using 20 to 30% ethyl acetate in hexane as the eluent

実験手順

Tert-butyl 3-bromo-1H-indazole-1-carboxylate (5.0 g, 16.8 mmol) and a mixture of the regio-isomers of 1-(4-methoxybenzyl)-5-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)-1H-tetrazole (Example 19, step ii) (7.92 g, 20.2 mmol) were dissolved in 100 ml of a 1 to 1 mixture of 1,4-dioxane and water under a nitrogen atmosphere. Sodium carbonate (5.35 g, 50.5 mmol) was added and the system was purged with nitrogen. Then Pd(PPh3)4 (486 mg, 0.42 mmol) was added and the reaction mixture was heated overnight at reflux temperature under a nitrogen atmosphere. After cooling to room temperature the mixture was diluted with water and extracted with ethyl acetate. The combined organic phases were washed with brine, dried over magnesium sulfate. After filtration the solvent was removed under reduced pressure. The residue was purified on SiO2 using 20 to 30% ethyl acetate in hexane as the eluent to give 3-(4-(1-(4-methoxybenzyl)-1H-tetrazol-5-yl)phenyl)-1H-indazole as a mixture of two regioisomers in a 2 to 1 ratio (2.8 g) as a white solid.

出典