Hydrogen Peroxide → N-[2,6-dimethyl-4-(1,2,2,2-tetrafluoro-1-trifluoromethyl-ethyl)-phenyl]-3-nitro-2,4,5-trifluoro-benzamide

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Reaction Conditions

Reaction Steps

To a solution of 3-amino-N-[2,6-dimethyl-4-(1,2,2,2-tetrafluoro-1-trifluoromethyl-ethyl)-phenyl]-2,4,5-trifluoro-benzamide (32.8 g, 71 mmol) (Example I14) and trifluoro-acetic acid (237 ml) in chloroform (118 ml) was added drop-wise aqueous hydrogen peroxide (67 ml) (35% w/v). The reaction mixture was kept at approximately 50° C. with external cooling. The reaction mixture was stirred at 55° C. for 30 minutes, then poured onto a mixture of ice and water. The mixture was extracted twice with dichloromethane. The combined organic phases were washed with aqueous sodium hydrogen carbonate (1M), dried over sodium sulfate and concentrated. The residue was purified by column chromatography on silica gel (eluent: cyclohexane/ethyl acetate 7:3) to give N-[2,6-dimethyl-4-(1,2,2,2-tetrafluoro-1-trifluoromethyl-ethyl)-phenyl]-3-nitro-2,4,5-trifluoro-benzamide (23.94 g, 68.5% yield). 1H-NMR (400 MHz, CDCl3): 2.35 (6H, s), 7.38 (2H, s), 7.68 (1H, d), 8.25 (1H, m) ppm.

Provenance & Evidence