Dimethylformamide → ethyl 4-chloro-1-(methoxymethyl)-7-[methyl(2-thienylsulfonyl)amino]-1H-indole-2-carboxylate

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Reaction Steps

A mixture of ethyl 4-chloro-1-(methoxymethyl)-7-[(2-thienylsulfonyl)amino]-1H-indole-2-carboxylate (1.14 g), methyl iodide (0.33 mL), potassium carbonate (0.37 g) and N,N-dimethylformamide (10 mL) was stirred at room temperature overnight. To the reaction mixture was added water, and the resulting crystals were filtrated, washed with water, and dried to give the title compound (1.10 g, yield 93%) as colorless crystals. melting point 137-138° C.

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