反应详情

温度

110 °C

A mixture of ethyl 2-amino-4-[3-(methyloxy)phenyl]-3-thiophene carboxylate (Description 39) (5 g, 18.03 mmol) and 20% aqueous solution of potassium hydroxide (100 mL, 18.03 mmol) in ethanol (100 mL) was heated at 110° C. for 24 h. After cooling to RT the ethanol was removed under reduced pressure. The residue was poured into water (100 mL) and extracted with ethyl acetate (50 mL×3). The organic layers were combined, washed with brine (100 mL), dried over MgSO4, filtered and evaporated in vacuo. The residue was purified by chromatography on silica, eluting with a gradient of 0-25% ethyl acetate in cyclohexane, to give the title compound (1.83 g). LCMS (A) m/z: 206 [M+1]+, Rt 1.14 min (acidic).

1. customwas removed under reduced pressure
2. additionThe residue was poured into water (100 mL)
3. extractionextracted with ethyl acetate (50 mL×3)
4. washwashed with brine (100 mL)
5. dry with materialdried over MgSO4
6. filtrationfiltered
7. customevaporated in vacuo
8. customThe residue was purified by chromatography on silica
9. washeluting with a gradient of 0-25% ethyl acetate in cyclohexane