反应详情

温度

80 °C

A stirred suspension of 4-hydroxy-3-methoxy-5-nitrobenzoic acid (2.00 g, 9.38 mmol) in thionyl chloride (8.2 mL) was heated at 80° C. for two hours. The excess of thionyl chloride was removed under vacuum. The resulting yellow solid was dissolved in DMA (15.4 mL), then (Z)-2,5-dichloro-N′-hydroxy-4,6-dimethylnicotinimidamide (2.636 g, 11.26 mmol) and pyridine (6.2 mL) were added. The red solution was heated to 120° C. for 2.5 hours. The reaction mixture was cooled to room temperature and poured into a mixture of cc HCl (10 ml) and ice (80 g), then stirred for thirty minutes. The yellow precipitate was filtered off, washed with water and dried under vacuum. Recrystallization from dichloromethane-isopropanol mixture afforded 2.42 g (62%) of 4-(3-(2,5-dichloro-4,6-dimethylpyridin-3-yl)-1,2,4-oxadiazol-5-yl)-2-methoxy-6-nitrophenol as yellow crystalline.

1. customThe excess of thionyl chloride was removed under vacuum
2. dissolutionThe resulting yellow solid was dissolved in DMA (15.4 mL)
3. temperatureThe red solution was heated to 120° C. for 2.5 hours
4. temperatureThe reaction mixture was cooled to room temperature
5. filtrationThe yellow precipitate was filtered off
6. washwashed with water
7. customdried under vacuum
8. customRecrystallization from dichloromethane-isopropanol mixture