反应详情

Thionyl chloride (0.34 mL, 4.7 mmol) was added to the mixture of methyl 4-(2-benzoylhydrazino)-4-oxobutanoate (900 mg, 4 mmol), Pyridine (0.87 mL, 0.011 mol) in tetrahydrofuran (20 mL) at room temperature. After stirring for 3 hours, the reaction mixture was concentrated. The residue was mixed with toluene (20 mL) and refluxed overnight. The reaction was diluted with water and extracted with ethyl acetate three times. The combined organic layers were dried with sodium sulfate, filtered, and concentrated in vacuo. The residue was purified by flash column chromatography to yield the desired product (600 mg, 72%). LCMS calculated for C12H13N2O3 (M+H): 233.1. found: 233.1.

1. concentrationthe reaction mixture was concentrated
2. additionThe residue was mixed with toluene (20 mL)
3. temperaturerefluxed overnight
4. additionThe reaction was diluted with water
5. extractionextracted with ethyl acetate three times
6. dry with materialThe combined organic layers were dried with sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated in vacuo
9. customThe residue was purified by flash column chromatography