反应详情

To a solution of (2-methyl-5-nitro-phenyl)-(5-pyridin-3-yloxazol-2-yl)-amine (600 mg, 2.02 mmol) in ethanol (20 mL) was added tin(II) chloride dihydrate (2.50 g, 10 mmol). The reaction mixture was heated under reflux for 6 h. The mixture was then concentrated, saturated aqueous NaHCO3 was added and the resultant suspension was extracted with ethyl acetate (3×20 mL). The combined organic layers were washed with brine (20 mL), dried over anhydrous MgSO4 and concentrated. The residue was silica gel column chromatographed (dichloromethane/ethanol:97/3). 350 mg (65%) of (2-methyl-5-amino-phenyl)-(5-pyridin-3-yl-oxazol-2-yl)-amine was obtained as pale yellow powder.

1. temperatureThe reaction mixture was heated
2. temperatureunder reflux for 6 h
3. concentrationThe mixture was then concentrated
4. additionsaturated aqueous NaHCO3 was added
5. extractionthe resultant suspension was extracted with ethyl acetate (3×20 mL)
6. washThe combined organic layers were washed with brine (20 mL)
7. dry with materialdried over anhydrous MgSO4
8. concentrationconcentrated
9. customchromatographed (dichloromethane/ethanol:97/3)