反应详情

温度

100 °C

A solution of N-(2-bromo-4-trifluoromethoxy-phenyl)-N-but-2-enyl-2,2,2-trifluoro-acetamide (10 g, 24.7 mmol) in DMF (50 mL) is treated with n-Bu4NCl (7.5 g, 27.2 mmol), Pd(OAc)2 (221 mg, 0.98 mmol), and stirred at 100° C. for 1 h. H2O (10 mL) is added, and the mixture is cooled to rt, filtered through a pad of silica gel. The filtrate is extracted with heptane (3×50 mL). The combined organic layer is dried (Na2SO4), filtered and concentrated in vacuo. The residue is purified by silica gel chromatography eluting with 0%-25% EtOAc in heptane to afford 3-ethyl-5-trifluoromethoxy-1H-indole (3.1 g, 55%). MS: 230 (M+H); 1H NMR (300 MHz, CDCl3): δ 7.97 (s, NH, 1H), 7.44 (s, 1H), 7.29 (m, 1H), 7.07 (m, 2H), 2.77 (q, 2H), 1.32 (t, 3H).

1. temperaturethe mixture is cooled to rt
2. filtrationfiltered through a pad of silica gel
3. extractionThe filtrate is extracted with heptane (3×50 mL)
4. dry with materialThe combined organic layer is dried (Na2SO4)
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customThe residue is purified by silica gel chromatography
8. washeluting with 0%-25% EtOAc in heptane