反应详情

温度

90 °C

To solution of 2-bromopyridin-4-ol (0.4 g, 2 mmol) and 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-pyrazole (0.99 g, 3 mmol) in Dioxane/H2O (3 ml/1.5 ml) was added PEPSI-IPr catalyst (0.078 g, 0.115 mmol) and followed by the addition of Cs2CO3 (1.65 g, 5 mmol). The reaction mixture was stirred at 90° C. for 30 minutes. The reaction mixture was diluted with EtOAc and washed with HCl (1N). Two phases were separated and the aqueous phase was extracted with EtOAc (3×). Organic phase were combined and concentrated down under vacuo. The residue was purified by silicone gel column. And 2-(1-((2-(trimethylsilyl)ethoxy)methyl)-1H-pyrazol-4-yl)pyridin-4-ol was obtained (0.61 g, 91.1%). LCMS-ESI+ (m/z): [M+H]+ calcd. for C26H30N5O3: 292.42; found: 292.11.

1. washwashed with HCl (1N)
2. customTwo phases were separated
3. extractionthe aqueous phase was extracted with EtOAc (3×)
4. concentrationconcentrated down under vacuo
5. customThe residue was purified by silicone gel column