Nitric Acid → 6-Fluoro-3-methyl-5-nitro-1,2-benzisoxazole

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Reaction Steps

A mixture of 6-fluoro-3-methyl-1,2-benzisoxazole (23.5 g, 0.156 mol) in concentrated sulfuric acid is cooled with an ice-bath, treated dropwise with 90% nitric acid (8.50 mL) while maintaining the reaction mixture temperature below 15° C., stirred for one hour at ice-bath temperature, treated with additional 90% nitric acid (5.80 mL), warmed to and stirred at room temperature overnight, and poured onto ice. The resultant aqueous mixture is filtered to obtain a solid. The solid is air-dried and dissolved in methylene chloride. The resultant organic solution is dried over anhydrous magnesium sulfate, diluted with hexanes, and filtered to give the title product as a purple solid which is identified by 1H NMR spectral analysis.

Provenance & Evidence