反应详情

To a solution (400 ml) of N′-(4-methoxybenzo(b)furan-2-ylcarbonyl)acetohydrazide (15.6 g) in 1,2-dichloroethane were added triethylamine (21 ml) and triphenylphosphine (19.8 g) and the reaction temperature was set to 5° C. To this reaction mixture was added dropwise diethyl azodicarboxylate (40% toluene solution) (33 ml) over 15 min. The reaction temperature was set to room temperature and the mixture was stirred for 1.5 hr and washed with saturated aqueous solution of ammonium chloride. After partitioning, the obtained organic layer was dried over anhydrous magnesium sulfate and the solvent was evaporated under reduced pressure. The obtained residue was concentrated under reduced pressure and purified by silica gel column chromatography (chloroform/ethyl acetate) to give the title compound (4.6 g) as pale-yellow crystals.

1. customwas set to 5° C
2. customwas set to room temperature
3. washwashed with saturated aqueous solution of ammonium chloride
4. customAfter partitioning
5. dry with materialthe obtained organic layer was dried over anhydrous magnesium sulfate
6. customthe solvent was evaporated under reduced pressure
7. concentrationThe obtained residue was concentrated under reduced pressure
8. custompurified by silica gel column chromatography (chloroform/ethyl acetate)