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under nitrogen gas, 1-bromo-3-chloro-5-nitrobenzene (57.4g, 0.243mol) dissolved in THF (500mL) , vinylmagnesium bromide (1M in THF, 728mL, 0.728mol) was slowly added -40 degree celcius , followed by stirring at -40 degree celcius for 1 hour.Since, After completion of the reaction with NH4Cl aqueous solution was raised to room temperature.Then, ethyl acetate and the organic layer was extracted with, MgSO4to remove moisture in the organic layer, filtered and concentrated and purified by column chromatography using 4-bromo-6-chloro-1H-indole(8.40g,Yield: 15percent) It was obtained.