反应详情

To a stirred solution of 4-amino-2,3-dichlorophenol (1.00 g, 5.62 mmol) in dry DMF (20 mL) under N2 was added K2CO3 (854 mg, 6.18 mmol) and the mixture kept at RT for 10 min and then treated with a solution of 4-chloro-3-nitropyridin-2-amine (1.024 g, 5.90 mmol) in dry DMF (5.0 mL) in a single portion. The reaction mixture was maintained at RT for 19 hr and was then partitioned between EtOAc (100 mL) and water (100 mL). The aq layer was separated and was extracted with EtOAc (4×70 mL) and the combined organic extracts were dried and evaporated in vacuo. The residue was purified by flash column chromatography (SiO2, 80 g, EtOAc in isohexane, 0-70%, gradient elution) to afford 4-(4-amino-2,3-dichlorophenoxy)-3-nitropyridin-2-amine as a dark solid (1.28 g, 70%); Rt 1.85 min (Method 2); m/z 315 (M+H)+ (ES+).

1. customwas then partitioned between EtOAc (100 mL) and water (100 mL)
2. customThe aq layer was separated
3. extractionwas extracted with EtOAc (4×70 mL)
4. customthe combined organic extracts were dried
5. customevaporated in vacuo
6. customThe residue was purified by flash column chromatography (SiO2, 80 g, EtOAc in isohexane, 0-70%, gradient elution)