反应详情

To a stirred suspension of 5.45, sodium hydride (55%) in mineral oil) in 100 ml N,N-dimethylformamide was added at 0-5° C. a solution of 16.8 g indole-5-carboxaldehyde in 100 ml N,N-dimethylformamide followed by 24.46 ml of 2-(trimethylsilyl)-ethoxymethyl chloride. The reaction mixture was then warmed up to ambient temperature and stirring continued for 16 hours. It was then poured onto ice, neutralized to pH 4 with HCl (1N) and extracted 3 times with ethyl acetate. The combined organic phases were washed with water, dried over magnesium sulfate and evaporated to give a brown oil, which was purified by chromatography (silicagel, eluent: gradient of n-heptane/EtOAc) to yield 25.52 g 1-(2-trimethylsilanyl-ethoxymethyl)-1H-indole-5-carbaldehyde as light yellow oil.

1. additionIt was then poured onto ice
2. extractionextracted 3 times with ethyl acetate
3. washThe combined organic phases were washed with water
4. dry with materialdried over magnesium sulfate
5. customevaporated
6. customto give a brown oil, which
7. customwas purified by chromatography (silicagel, eluent: gradient of n-heptane/EtOAc)