反应详情

3-Methyl-4-nitrobenzoic acid (3.0 g, 16.56 mmol) in DMF (30 mL) was stirred with carbonyl diimidazole (3.22 g, 1.2 Eq.) for 90 mins. The reaction mixture was cooled in an icebath, and dimethylamine (2 M in THF, 25 mL, 3 Eq.) was added. The mixture was then allowed to warm to room temperature and stirred for 2 hours. The mixture was poured onto ice water (200 ml) and extracted with EtOAc (×6). The combined extracts were washed with brine, dried over MgSO4, filtered and evaporated. Tritration with ether followed by filtration gave N,N,3-trimethyl-4-nitrobenzamide (2.6 g, colourless solid); MS (ES+) 209.

1. additionwas added
2. additionThe mixture was poured onto ice water (200 ml)
3. extractionextracted with EtOAc (×6)
4. washThe combined extracts were washed with brine
5. dry with materialdried over MgSO4
6. filtrationfiltered
7. customevaporated
8. filtrationTritration with ether followed by filtration