反应详情

A solution of 6.35 g (20.8 mmol) of 3-chloro-2,4-difluoro-6-nitro-(trifluoroacetamido)benzene in 60 mL of 7% K2CO3 methanol/water (3:2) was stirred at 25° C. for 4 h. The solution was evaporated to remove the methanol. Solid was observed in the residue. It was filtered, washed with water, and dried to leave 301 mg of a crystalline yellow solid; mp 96°-97° C.; 1H NMR (CDCl3), 6.07 (mb, 2), 7.815 (dd, 1, J=1.92, 9.13). More solid was observed after the mother aqueous solution was allowed to stand at room temperature overnight. It was filtered, washed with water, and dried to leave a yellow solid (1.01 g). More solid was crystallized from the mother solution. It was collected three more times to provide 2.48 g of a yellow solid. 1H NMR is identical with above, total yield 3.80 g (87%).

1. customThe solution was evaporated
2. customto remove the methanol
3. filtrationIt was filtered
4. washwashed with water
5. customdried