Dimethylformamide → methyl 2-methyl-1H-indole-4-carboxylate

참여 물질

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To a solution of 2-methyl-4-trifluoromethanesulfoxyindole (6.32 g; prepared in Reference Example 1) in methanol (33.43 ml)-N,N-dimethylformamide (200 ml) was added triethylamine (6.3 ml) and tetrakis(triphenylphosphine)palladium (2.6 g). The inside of the vessel was replaced with carbon monoxide and the mixture was stirred at 60° C. overnight. After the reaction was completed, to the mixture was added water and ethyl acetate and then the mixture was extracted. The aqueous layer was extracted with ethyl acetate. The combined organic layer was washed with water and a saturated aqueous solution of sodium chloride, successively, dried and concentrated under reduced pressure. The residue was purified by column chromatography on silica gel (n-hexane-ethyl acetate) to give the title compound (4.29 g) having the following physical data.

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