[OH:1][CH:2]([C:4]1[CH:12]=[CH:11][CH:10]=[C:9]2[C:5]=1[CH:6]=[CH:7][N:8]2[S:13]([C:16]1[CH:22]=[CH:21][C:19]([CH3:20])=[CH:18][CH:17]=1)(=[O:15])=[O:14])[CH3:3].[CH2:23](I)[CH3:24].[OH-].[K+]>C(Cl)Cl.S([O-])(O)(=O)=O.C([N+](CCCC)(CCCC)CCCC)CCC>[CH2:23]([O:1][CH:2]([C:4]1[CH:12]=[CH:11][CH:10]=[C:9]2[C:5]=1[CH:6]=[CH:7][N:8]2[S:13]([C:16]1[CH:17]=[CH:18][C:19]([CH3:20])=[CH:21][CH:22]=1)(=[O:15])=[O:14])[CH3:3])[CH3:24]11.9 g (37.8 mmol) of 4-(1-hydroxyethyl)-1-tosyl indole in 150 ml of methylene chloride was mixed at room temperature under argon with 13.3 g (85 mmol) of ethyl iodide, 6.7 g of tetrabutylammonium hydrogen sulfate and 6.7 g (119.3 mmol) of pulverized potassium hydroxide one after the other. The solution was stirred for 2 hours. After filtration over silica gel, the solution was again mixed with equal amounts of ethyl iodide, tetrabutylammonium hydrogen sulfate and potassium hydrogen oxide. The reaction mixture was stirred for 2 hours at room temperature, washed with 200 ml of water and the organic phase dried, filtered and concentrated. Subsequent chromatography on silica gel with cyclohexane/ethyl acetate (8:2) yielded 8.5 g of 4-(1-ethoxyethyl)-1-tosyl indole as oil.
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