反应详情

温度

70 °C

2,2,2-trifluoroacetamide (0.53 g, 4.7 mmol) in dimethylformamide (2 ml) was added dropwise to a suspension of sodium hydride (80%, 1.4 g, 4.7 mmol) in dimethylformamide (2 ml). After one hour at room temperature 6-nitro-2,2-dimethyl-3-bromomethyl-2H-1-benzopyran (1.4 g, 4.7 mmol) was added and the mixture heated at 70° C. for eighteen hours. Water and ethyl acetate were added to the cooled solution and the organic phase separated and evaporated to give 0.51 g of 6-nitro-2,2-dimethyl-3-(trifluoroacetamido)methyl-2H-1-benzopyran, 1NMR (CDCl3): δ 1.5 (s, 6H) , 4.15 (d, 2H) , 6.25 (s, 1H) , 6.85 (d, 1H), 6.9 (br.s), 1H), 7.85 (s, 1H), 8.05 (d, 1H).

1. customthe organic phase separated
2. customevaporated