Trifluoroacetic acid → 2-Hydroxy-2-(4-isopropyl-2-methoxyphenyl)-4-nitro-2H-inden-1,3-dione

Participants

Reaction Conditions

Reaction Steps

A solution of 4-nitro-2,3-dihydro-1H-inden-1-one (4.00 g, 20.9 mmol) in 1,4-dioxane (40 ml) and glacial acetic acid (4 ml) was added with selenium dioxide (5.10 g, 46.03 mmol), and refluxed for 3 hrs. After filtration at high temperature, the filtrate was concentrated to afford 2,2-dihydroxy-4-nitro-2H-inden-1,3-dione (4.67 g, 100%). To a solution of 2,2-dihydoxy-4-nitro-2H-inden-1,3-dione (4.67 g, 20.9 mmol) in TFA (10 ml) was added isopropyl anisole (3.14 g, 20.9 mmol), followed by stirring at 60° C. for 6 hrs. The reaction mixture was concentrated in a vacuum, and extracted with aq. sodium bicarbonate and ethylacetate. The concentrated organic layer was purified using column chromatography (ethylacetate:hexane=1:4) to afford the title compound (1.19 mg, 16%).

Provenance & Evidence