反应详情

温度

110 °C

A flask was charged with 2-bromo-5H-pyrrolo[2,3-b]pyrazine (9.5 g, 48 mmol), 3,4,5-trimethoxyphenylboronic acid (13.22, 62 mmol), and K2CO3 (19.9, 144 mmol). Dioxane (213 ml) and water (71 ml) were added, and the solution was vacuum degassed under argon. [1,1′-bis(Diphenylphosphino)ferrocene]dichloro-palladium(ll) (3.92 g, 4.8 mmol) was added, and the reaction mixture was refluxed (110° C.) overnight. The reaction mixture was filtered through a plug of celite using dichloromethane, and the filtrate was concentrated giving a black oil. The oil was purified by silica gel chromatography using 5%-60% EtOAc in hexanes as eluant to provide 12.12 g (89%) of 2-(3,4,5-trimethoxy-phenyl)-5H-pyrrolo[2,3-b]pyrazine.

1. customdegassed under argon
2. filtrationThe reaction mixture was filtered through a plug of celite
3. concentrationthe filtrate was concentrated
4. customgiving a black oil
5. customThe oil was purified by silica gel chromatography