反应详情

A solution of 6-nitro-2,2-dimethyl-3-hydroxy-3,4-dihydro-3-(trifluoroacetamido)methyl-4-(2-oxo-1,2-dihydropyridin-1-yl)-2H-1-benzopyran (0.5 g, 1.13 mmol) in tetrahydrofuran (20 ml) containing sodium hydride (80%, 0.034 g, 1.13 mol) was refluxed for one hour. Water and ethyl acetate were added to the cooled solution and the organic phase was separated and evaporated under reduced pressure. The residue was chromatographed on silica gel, eluting with dichloromethane/acetone (95/5), to give 0.13 g of 6-nitro-2,2-dimethyl-3-(trifluoroacetamido)methyl-4-(2-oxo-1,2-dihydropyridin-1-yl)-2H-1-benzopyran, m.p. 189° C.

1. temperaturewas refluxed for one hour
2. customthe organic phase was separated
3. customevaporated under reduced pressure
4. customThe residue was chromatographed on silica gel
5. washeluting with dichloromethane/acetone (95/5)