反应详情

DBU (0.020 mL, 0.130 mmol) was added to a solution of (±)-5-chloro-7-(1-hydroxyethyl)-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-indole-3-carbonitrile (456 mg, 1.299 mmol) and Trichloroacetonitrile (0.391 mL, 3.90 mmol) in THF (10 mL) and the reaction was stirred for one hour. The solvent was evaporated and the reaction was purified by chromatography on SiO2 with 10:89:1 ethyl acetate/hexanes/triethylamine to give (±)-1-(5-chloro-3-cyano-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-indol-7-yl)ethyl 2,2,2-trichloroacetimidate (472 mg, 0.953 mmol, 73.3% yield) as a clear oil. 1H-NMR (CDCl3, 400 MHz) δ 8.22 (s, 1H), 7.66 (d, J=2.0 Hz, 1H), 7.61 (s, 1H), 7.52 (d, J=2.0 Hz, 1H), 6.60 (q, J=6.3 Hz, 1H), 6.27 (d, J=11.3 Hz, 1H), 5.25 (d, J=11.3 Hz, 1H), 3.48 (m, 2H), 1.72 (d, J=6.3 Hz, 3H), 0.80-1.05 (m, 2H), −0.02 (s, 9H).

1. customThe solvent was evaporated
2. customthe reaction was purified by chromatography on SiO2 with 10:89:1 ethyl acetate/hexanes/triethylamine