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 and it was filtered and washed by water, and dried to leave 301 mg of 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 and washed by water, and dried to leave yellow solid (1.01 g). More solid was crystallized from the mother solution. It was collected three more times to leave 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. filtrationwas filtered
4. washwashed by water
5. customdried