反应详情

To an ethanol (70 ml) and water (25 ml) mixed solution of 2.5 g of 1-[6-(3,4-dimethoxyphenyl)pyridine-2-carbonyl]-4-(4-nitrophenyl)piperazine were added 0.15 g of ammonium chloride and 3.1 g of reduced iron, followed by 2 hours of heating under reflux. The reaction solution was filtered through celite and the filtrate was concentrated under reduced pressure. An aqueous sodium hydrogen carbonate solution was added to thus obtained residue, followed by extraction with chloroform. The organic layer was washed with brine and then dried over anhydrous magnesium sulfate, and thereafter, the solvent was evaporated. The residue was purified by silica gel column chromatography (chloroform-methanol) and further, crystallization was carried out from acetonitrile-ethyl acetate to obtain 2.1 g of 1-[6-(3,4-dimethoxyphenyl)pyridine-2-carbonyl]-4-(4-aminophenyl) piperazine as pale pink crystals.

1. temperatureof heating
2. temperatureunder reflux
3. filtrationThe reaction solution was filtered through celite
4. concentrationthe filtrate was concentrated under reduced pressure
5. additionAn aqueous sodium hydrogen carbonate solution was added to thus obtained residue
6. extractionfollowed by extraction with chloroform
7. washThe organic layer was washed with brine
8. dry with materialdried over anhydrous magnesium sulfate
9. customthe solvent was evaporated
10. customThe residue was purified by silica gel column chromatography (chloroform-methanol)
11. customfurther, crystallization