Ethanamine, 2,2,2-trifluoro- → (2',2',2'-trifluoroethyl)-6-nitro-2,2-dimethyl-2H-1-benzopyran-4-carboxamide

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A mixture of 1.00 g of 6-nitro-2,2-dimethyl-2H-1-benzopyran-4-carboxylic acid, 0.44 g of 2,2,2-trifluoroethylamine, 0.97 g of 2,2'-dipyridyl disulfide, 1.16 g of triphenylphosphine, and 20 ml of dichloromethane was stirred at room temperature for 3 hours. The solvent was removed therefrom by distillation, and the residue was purified by silica gel column chromatography (developing solution; AcOEt:n-hexane=1:1) and then recrystallized from a mixture of n-hexane and ethyl acetate to obtain 0.98 g of N (2',2',2'-trifluoroethyl)-6-nitro-2,2-dimethyl-2H-1-benzopyran-4-carboxamide represented by formula shown below.

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