6-Methoxy-1,2,3,4-tetrahydroquinolin-2-one → 6-Methoxy-7-nitro-1,2,3,4-tetrahydroquinolin-2-one

Participants

Reaction Steps

A solution of 6-(methyloxy)-3,4-dihydro-2(1H)-quinolinone (400 mg, 2.25 mmol, Precursor Chemicals) in trifluoroacetic acid (4 mL, Aldrich) was treated with sodium nitrite (156 mg, 2.26 mmol, added slowly in about 4 portions, Aldrich). The dark brown reaction was stirred for 1 h after which an aliquot was taken out, diluted with water and extracted with ethyl acetate. TLC analysis of the ethyl acetate layer revealed that starting material remained. More sodium nitrite (50 mg, 0.72 mmol) was added and the reaction stirred for another 2 h at which point some precipitation was observed in the reaction. The reaction was poured over ice and then extracted with ethyl acetate. The organic layer, which still had undissolved solids in it, was concentrated to give 6-(methyloxy)-7-nitro-3,4-dihydro-2(1H)-quinolinone (372 mg, 70%) as a white powder. 1H NMR (400 MHz, DMSO-d6) 5 ppm 2.45-2.49 (m, 2 H), 2.98 (t, J=7.5 Hz, 2 H), 3.88 (s, 3 H), 7.29 (s, 1 H), 7.38 (s, 1 H), 10.18 (bs, 1 H).

Provenance & Evidence