Potassium Carbonate → 1-Phenyl-2-(4-hydroxy-2-butenylthio)indole

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Reaction Steps

To a solution of the product of the above (1)(2.2 g) in acetone (20 ml) are added potassium carbonate (1.54 g) and 4-chloro-2-butyn-1-ol (1.03 g). The mixture is stirred for 4 hours and filtered. The filtrate is condensed at below the room temperature. The oily residue is dissolved in benzene and evaporated at below the room temperature. Ether is added to the residue and then a 30% solution (1.5 ml) in methylamine in methanol on ice bath. The mixture is stirred for 30 minutes and after addition of ether, washed with ice-cooled 3 N-hydrochloric acid, water, an aqueous solution of sodium bicarbonate and water successively. The ether layer is dried and evaporated to give the title compound as an oil (3.1 g). The oil is chromatographed on a column of silica gel and eluted with hexane-benzene (1:10) benzene and ether-benzene (1:100) successively. The title compound is obtained as colorless oil.

Provenance & Evidence