反应详情

5 g of 3-methoxy-2-nitrobenzaldehyde are dissolved in a solution of 100 ml of ethanol, 100 ml of acetic acid and 50 ml of water. After addition of 11.4 g of iron and of 1.4 ml of concentrated hydrochloric acid, the reaction medium is heated at reflux for 10-15 minutes. After having cooled the reaction medium, 150 ml of water are added and the reaction mixture is extracted with 3×200 ml of dichloromethane. The organic phases are combined, washed with 500 ml of a saturated sodium hydrogencarbonate solution, dried over magnesium sulfate, filtered and evaporated under vacuum to provide 4.7 g of 3-methoxy-2-aminobenzaldehyde in the form of a colorless oil, used without purification in the following stage. (Yield: quantitative)

1. temperatureat reflux for 10-15 minutes
2. additionare added
3. extractionthe reaction mixture is extracted with 3×200 ml of dichloromethane
4. washwashed with 500 ml of a saturated sodium hydrogencarbonate solution
5. dry with materialdried over magnesium sulfate
6. filtrationfiltered
7. customevaporated under vacuum