反应详情

温度

150 °C

Ethyl 2-(3,5-dibromopyrazin-2-ylamino)acetate (See Example 6.B) (30.0 g, 88 mmol), trans-4-methoxycyclohexanamine (17.15 g, 133 mmol), N,N-diisopropylethylamine (30.8 mL, 177 mmol) and dimethylsulfoxide (70.8 mL) were combined in a reaction vial with a stirbar and heated in an oil bath at 150° C. for 16 h with stirring. The resulting mixture was diluted with ethyl acetate and the volatiles removed under reduced pressure. The residue was purified using silica gel chromatography on a Biotage SP1 (12% ethyl acetate in hexanes). Fractions containing the desired product were combined and organic volatiles removed under reduced pressure. The residue was triturated with 5% ethyl acetate in hexane. Solids were collected by vacuum filtration, washed with hexane and dried under vacuum to afford ethyl the title compound (15.37 g, 39.7 mmol, 44.8% yield) as an off-white solid. MS (ESI) m/z 387.0 [M]+, 389.0 [M+2]+.

1. customthe volatiles removed under reduced pressure
2. customThe residue was purified
3. additionFractions containing the desired product
4. customorganic volatiles removed under reduced pressure
5. customThe residue was triturated with 5% ethyl acetate in hexane
6. filtrationSolids were collected by vacuum filtration
7. washwashed with hexane
8. customdried under vacuum