反应详情

温度

70 °C

6.5 g (29 mmol, 4 eq.) of tin(II) chloride dihydrate were added to a solution of 1.5 g (7.2 mmol) of 3-(4-nitrophenyl)-1,2,4-oxadiazol-5(4H)-one in 75 ml of ethanol, and the mixture was stirred at 70° C. for 1 h. The reaction mixture was poured into ice-water, and sodium bicarbonate was added carefully until a pH of 8 had been reached. The mixture was filtered through a filter layer and the residue was washed with ethyl acetate. The combined filtrates were concentrated under reduced pressure. The residue was stirred with dichloromethane and methanol, treated in an ultrasonic bath for 10 min and then filtered. The filtrate was concentrated under reduced pressure and dried. Yield: 1.4 g (quant.)

1. additionwas added carefully until a pH of 8
2. filtrationThe mixture was filtered through a filter layer
3. washthe residue was washed with ethyl acetate
4. concentrationThe combined filtrates were concentrated under reduced pressure
5. stirringThe residue was stirred with dichloromethane and methanol
6. additiontreated in an ultrasonic bath for 10 min
7. filtrationfiltered
8. concentrationThe filtrate was concentrated under reduced pressure
9. customdried