反应详情

温度

70 °C

7-Methylquinoline-2-carbonitrile N-oxide (1-4, 5.3 g, 28.8 mmol, 1.0 equiv.) was dissolved in CHCl3 (80 ml, 0.36 M), and POCl3 was added (16.09 ml, 173 mmol, 6.0 equiv.). The mixture was heated to 70° C. overnight, quenched onto crushed ice and extracted three times with dichloromethane. The combined organic layers were washed with water followed by saturated aqueous sodium bicarbonate, dried over MgSO4, filtered and the solvent was removed to yield crude yellow solid. Recrystallization from heptane/EtOAc gave 95 g of 4-chloro-7-methylquinoline-2-carbonitrile (1-5). LRMS m/z (M+H)+203.2 found, 203.6 required.

1. customquenched
2. customonto crushed ice
3. extractionextracted three times with dichloromethane
4. washThe combined organic layers were washed with water
5. dry with materialdried over MgSO4
6. filtrationfiltered
7. customthe solvent was removed
8. customto yield crude yellow solid
9. customRecrystallization from heptane/EtOAc