反应详情

温度

115 °C

6-Bromo-1H-indazol-4-amine (10 g) (available from Sinova Inc.) and 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indole (16.05 g) (available from Frontier Scientific, Europe Ltd) were dissolved in 1,4-dioxane (60 ml) and water (60 ml). 2M sodium carbonate (70.7 ml) and Pd(dppf)Cl2-DCM adduct (1.93 g) were added and the mixture was heated at 115° C. for 18 h. The reaction mixture was diluted with DCM (200 ml) and the organic and aqueous layers were separated using a hydrophobic frit. The aqueous layer was extracted with further quantities of DCM (2×200 ml), using a hydrophobic frit to separate the layers. The organic layers were combined and silica (80 g) was added. The solvent was removed in vacuo to give a crude material that was purified by chromatography on silica gel (750 g cartridge, Flashmaster II) eluting with 0-100% ethyl acetate in cyclohexane over 60 min. The oil was dried in vacuo on a drying rack overnight. The yellow foam was dissolved in DCM (3×400 ml), removing the solvent in vacuo after each dissolution. ethyl acetate (50 ml) was then added and the solvent was removed in vacuo. The solid obtained was dried in a vacuum oven to afford the title compound (12.8 g) as a yellow foam.

1. customthe organic and aqueous layers were separated
2. extractionThe aqueous layer was extracted with further quantities of DCM (2×200 ml)
3. customto separate the layers
4. additionsilica (80 g) was added
5. customThe solvent was removed in vacuo
6. customto give a crude material that
7. customwas purified by chromatography on silica gel (750 g cartridge, Flashmaster II)
8. washeluting with 0-100% ethyl acetate in cyclohexane over 60 min
9. customThe oil was dried in vacuo on a drying rack overnight
10. dissolutionThe yellow foam was dissolved in DCM (3×400 ml)
11. customremoving the solvent in vacuo
12. dissolutionafter each dissolution
13. additionethyl acetate (50 ml) was then added
14. customthe solvent was removed in vacuo
15. customThe solid obtained
16. customwas dried in a vacuum oven