反应详情

温度

90 °C

Nitrogen was bubbled through a solution of 3-methoxyphenyl boronic acid (393 mg, 2.59 mmol), 2-amino-5-bromopyrazine (300 mg, 1.72 mmol), sodium carbonate (603 mg, 5.69 mmol), dimethoxyethane (10 mL), and water (3 mL) for 15 min. After this time, the solution was treated with dichlorobis(triphenylphosphine)palladium(II) (121 mg, 0.17 mmol), and the resulting reaction mixture was heated at 90° C. for 2 d. The reaction was then poured into water (50 mL) and extracted with ethyl acetate (3×50 mL). The combined organic layers were dried over magnesium sulfate, filtered, and concentrated in vacuo. Biotage chromatography (FLASH 40S, Silica, 40/60 hexanes/ethyl acetate) afforded 5-(3-methoxy-phenyl)-pyrazin-2-ylamine (218 mg, 63%) as a light yellow solid: mp 113.2–115.5° C.; EI-HRMS m/e calcd for C11H11N3O (M+) 201.0902, found 201.0905.

1. customthe resulting reaction mixture
2. extractionextracted with ethyl acetate (3×50 mL)
3. dry with materialThe combined organic layers were dried over magnesium sulfate
4. filtrationfiltered
5. concentrationconcentrated in vacuo