反应详情

A solution of 2,6-dichloropyrazine (1 g, 62 mmol) and aniline (1.25 g, 13.4 mmol) in ethoxyethanol (20 mL) containing DIPEA (2.5 mL, 13.4 mmol) was heated at reflux for 3 days under N2. The solution was concentrated under reduced pressure and the residue dissolved in EtOAc (50 mL) and washed successively with H2O (50 mL), 1M HCl (2×50 mL), H2O (50 mL) and brine (50 mL). After drying (Na2SO4) the solvent was removed under reduced pressure and the residue chromatographed eluting with EtOAc-hexane (20:80-50:50) to separate pure product from the lower fractions (230 mg, 17%).

1. temperaturewas heated
2. temperatureat reflux for 3 days under N2
3. concentrationThe solution was concentrated under reduced pressure
4. dissolutionthe residue dissolved in EtOAc (50 mL)
5. washwashed successively with H2O (50 mL), 1M HCl (2×50 mL), H2O (50 mL) and brine (50 mL)
6. dry with materialAfter drying (Na2SO4) the solvent
7. customwas removed under reduced pressure
8. customthe residue chromatographed
9. washeluting with EtOAc-hexane (20:80-50:50)
10. customto separate pure product from the lower fractions (230 mg, 17%)