反应详情

A mixture of 6-Bromoquinoxaline (1.05 g, 5.02 mMol), tetrakis(triphenylphosphine)palladium (0.232 g, 0.2 mMol), and lithium chloride (0.639 g, 15.1 mMol) in dry toluene (50 mL) under nitrogen was treated with tributylvinyl tin (4.4 mL, 15.1 mMol) and heated to one hundred degrees for three hours. After cooling to room temperature the mixture was partitioned between ethyl acetate (200 mL) and water (100 mL). The aqueous layer was discarded and the organics washed with brine (2×100 mL), dried with magnesium sulfate, filtered, and concentrated to dryness on a rotary evaporator. Purification by flash column chromatography on silica gel using 10% ethyl acetate in dichloromethane as eluant yielded 680 mg (87% yield) of 6-vinylquinoxaline as a light orange solid. 1H NMR (DMSO-d6): δ=8.92 (dd, 2H, J=14.1, 1.9 Hz), 8.10 (m, 3H), 7.03 (dd, 1H, J=17.7, 10.9 Hz), 6.15 (dd, 1H, J=17.7, 0.4Hz), 5.52 (d, 1H, J=11.1 Hz). LC/MS (Method A), rt=1.14 mins., purity=99%, calculated mass=156, [M+H]+=157.

1. temperatureheated to one hundred degrees for three hours
2. customwas partitioned between ethyl acetate (200 mL) and water (100 mL)
3. washthe organics washed with brine (2×100 mL)
4. dry with materialdried with magnesium sulfate
5. filtrationfiltered
6. concentrationconcentrated to dryness on a rotary evaporator
7. customPurification by flash column chromatography on silica gel using 10% ethyl acetate in dichloromethane as eluant