反应详情

Add potassium tert butoxide 1.0 M (1.6 mL, 0.0016 mol) dropwise to a stirring solution of 3-isopropyl indole (0.217 g, 00136 mol) in dry DMF (20 mL) under N2 at ambient temperature. Stir the reaction mixture for 30 minutes and add portionwise 4-chlorosulfonyl benzoic acid methyl ester (0.328 g, 0.0014 mol). The light brown reaction mixture decolorizes immediately. Stir the resulting yellow solution overnight. Pour into a EtOAc—H2O mixture (100 to 300 mL). Separate the EtOAc and sequentially extract with H2O (3×250 mL), wash with brine, dry (MgSO4), filter and evaporate giving 0.38 g. Chromatograph on the ISCO using a gradient hexane-EtOAc (0-50%, 30 30 minutes) to give 0.249 g (51%) of the title compound as a waxy solid. Mass spectrum (m/e) (M+H) 358.1113. found (M+H) 358.1129.

1. stirringStir the resulting yellow solution overnight
2. customSeparate the EtOAc
3. extractionsequentially extract with H2O (3×250 mL)
4. washwash with brine
5. dry with materialdry (MgSO4)
6. filtrationfilter
7. customevaporate
8. customgiving 0.38 g