反应详情

温度

150 °C

Ethyl 2-(3,5-dibromopyrazin-2-ylamino)acetate (See Example 1.C) (1.06 g, 3.13 mmol), (2,4-dimethoxyphenyl)methanamine (0.601 g, 3.60 mmol), N,N-diisopropylethylamine (1.63 mL, 9.38 mmol) and dimethylsulfoxide (1.6 mL) were combined in a microwave vial with a stirbar and heated in a microwave reactor at 150° C. for 2 h. The resulting mixture was purified using flash chromatography (5-60% ethyl acetate in hexane). Fractions containing the desired product were combined and concentrated nearly to dryness under reduced pressure. Ethyl acetate (2 mL) and hexane (18 mL) was added. The resulting solids were collected by vacuum filtration, washed with hexane and dried under high vacuum to give the desired product (0.636 g, 1.495 mmol, 48% yield) as a light pink solid. 1H NMR (300 MHz, DMSO-d6) δ (ppm) 7.24 (s, 1H), 7.19 (d, J=8.52 Hz, 1H), 7.11 (t, J=5.63 Hz, 1H), 6.84 (t, J=4.81 Hz, 1H), 6.59 (d, J=2.47 Hz, 1H), 6.50 (dd, J=2.20, 8.24 Hz, 1H), 4.37 (d, J=4.67 Hz, 2H), 3.96-4.15 (m, 4H), 3.81 (s, 3H), 3.75 (s, 3H), 1.17 (t, 3H); MS (ESI) m/z 425.3 [M]+, 426.9 [M+2]+.

1. customThe resulting mixture was purified
2. additionFractions containing the desired product
3. concentrationconcentrated nearly to dryness under reduced pressure
4. additionEthyl acetate (2 mL) and hexane (18 mL) was added
5. filtrationThe resulting solids were collected by vacuum filtration
6. washwashed with hexane
7. customdried under high vacuum