反应详情

温度

135 °C

To a stirred suspension of 3-hydroxy-4-methoxy-2-nitrobenzoic acid (0.900 g, 4.22 mmol) in N,N-dimethylacetamide (10.35 mL) at room temperature was added 1,1-carbonyldiimidazole (1.540 g, 9.506 mmol) in 7.65 ml of N,N-dimethylacetamide dropwise. After stirring for three hours, (Z)-2,5-dichloro-N′-hydroxy-4,6-dimethylnicotinimidamide (1.19 g, 5.107 mmol) was added in 2.7 ml of N,N-dimethylacetamide in one portion. The resulting mixture was stirred for one hour and forty five minutes then heated at 135° C. for one hour. The reaction mixture was poured onto ice/2N HCl mixture. The precipitate was filtered off, washed with water and dried under vacuum to give a yellow solid. Recrystallisation from dichloromethane/isopropanol gave 3-(3-(2,5-dichloro-4,6-dimethylpyridin-3-yl)-1,2,4-oxadiazol-5-yl)-6-methoxy-2-nitrophenol as a yellow solid (0.317 g, 18%).

1. stirringThe resulting mixture was stirred for one hour and forty five minutes
2. additionThe reaction mixture was poured onto ice/2N HCl mixture
3. filtrationThe precipitate was filtered off
4. washwashed with water
5. customdried under vacuum
6. customto give a yellow solid
7. customRecrystallisation from dichloromethane/isopropanol