反应详情

A solution of 1-acetyl-6-(methyloxy)-1,2,3,4-tetrahydroquinoline (500 mg, 2.44 mmol, Aldrich) in trifluoroacetic acid (4 mL, Aldrich) was treated with sodium nitrite (169 mg, 2.45 mmol, added slowly in about 4 portions, Aldrich). The dark brown reaction was stirred for 2 h and then poured over ice. The mixture was extracted with ethyl acetate and the organic layer was separated, dried over magnesium sulfate, filtered, concentrated, and purified by chromatography on SiO2 (0 to 100% ethyl acetate/hexanes) to give 1-acetyl-6-(methyloxy)-7-nitro-1,2,3,4-tetrahydroquinoline (357 mg, 59%). 1H NMR (400 MHz, DMSO-d6) is complicated due to amide rotomers δ ppm 1.83-1.94 (m, 2 H), 2.14-2.25 (m, 3 H), 2.76-2.85 (m, 2 H), 3.64-3.73 (m, 2 H), 3.86-3.92 (m, 3 H), 7.14-7.25 (m, 1 H), 8.38 (very broad singlet, 1H).

1. additionadded slowly in about 4 portions, Aldrich)
2. customThe dark brown reaction
3. additionpoured over ice
4. extractionThe mixture was extracted with ethyl acetate
5. customthe organic layer was separated
6. dry with materialdried over magnesium sulfate
7. filtrationfiltered
8. concentrationconcentrated
9. custompurified by chromatography on SiO2 (0 to 100% ethyl acetate/hexanes)