反应详情

A mixture of 6-chloro-N-[(1S)-1-phenylethyl]pyrazin-2-amine (1.10 g, 4.71 mmol), 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl) aniline (1.10 g, 5.02 mmol), (PPh3)4Pd (580 mg, 0.5 mmol) and a Na2CO3 solution (2.6 ml, 2M solution) in toluene (20 ml) was heated under reflux for 40 h. Upon cooling, the mixture was diluted with water (30 mL) and the product extracted with ethyl acetate (3×40 ml). The organic layers were combined, washed with brine (30 ml), dried (Na2SO4), and the solvent removed in vacuo. The residue was purified by column chromatography, eluting with a hexane-ethyl acetate (2:3) to furnish the desired product from the polar fractions (0.86 g, 63%).

1. temperatureunder reflux for 40 h
2. temperatureUpon cooling
3. extractionthe product extracted with ethyl acetate (3×40 ml)
4. washwashed with brine (30 ml)
5. dry with materialdried (Na2SO4)
6. customthe solvent removed in vacuo
7. customThe residue was purified by column chromatography
8. washeluting with a hexane-ethyl acetate (2:3)