Trifluoroacetic acid → 7-Fluoro-1-methyl-5-nitro-1,3-dihydro-indol-2-one

Participants

Reaction Steps

To a stirring suspension of trifluoroacetic acid (15 mL) and sodium nitrate (0.381 g, 4.48 mmol) was added 7-fluoro-1-methyl-1,3-dihydro-indol-2-one (7, 0.740 g, 4.48 mmol) and the reaction stirred at room temp. After 3½ hrs material poured onto ice water, filtered off resulting a precipitate. Dried on buchner funnel under vacuum overnight to give the title compound. 1H NMR (400 MHz, CHLOROFORM-D) δ ppm 3.4 (d, J=2.7 Hz, 3H) 3.6 (s, 2H) 8.0 (m, 2H).

Provenance & Evidence