反应详情

温度

80 °C

To a 500 ml round bottom flask equipped with a magnetic stir bar was added 3-bromo-5-nitro-1-trityl-1H-indazole (13.13 g, 27.1 mmol), followed by the additions of 4-pyridine boronic acid (5.00 g, 40.7 mmol), PdCl2(dppf) (2.21 g, 2.7 mmol) and K3PO4 (14.39 g, 67.8 mmol). The mixture was dissolved in a mixture of 160 ml of dioxane and 40 ml of H2O and stirred overnight at 80° C. Upon completion, the reaction mixture was filtered through a pad of celite and washed with water (3×100 ml). The organic phase was then dried over anhydrous MgSO4, filtered and concentrated to give a crude product. The crude product was column purified (30% EtAOc/Hexane) to give 5-nitro-3-(pyridin-4-yl)-1-trityl-1H-indazole (10.7 g) as a yellow solid.

1. customTo a 500 ml round bottom flask equipped with a magnetic stir bar
2. filtrationUpon completion, the reaction mixture was filtered through a pad of celite
3. washwashed with water (3×100 ml)
4. dry with materialThe organic phase was then dried over anhydrous MgSO4
5. filtrationfiltered
6. concentrationconcentrated
7. customto give a crude product
8. custompurified (30% EtAOc/Hexane)