1,1-Dimethoxyethyl(dimethyl)amine → 1-(4-Fluorobenzyl)-5-methanesulfonyl-2-(3-methyl-[1,2,4]oxadiazol-5-yl)indole

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A mixture of 1-(4-fluorobenzyl)-5-methanesulfonylindole-2-carboxamide (63 mg) and dimethylacetamide dimethylacetal (1 ml) was stirred at 110° C. for 1 hour. The reaction mixture was concentrated under reduced pressure. A mixture of the resulting residue, hydroxylamine hydrochloride (25 mg), a 2N aqueous sodium hydroxide solution (0.18 ml), 1,4-dioxane (0.4 ml) and acetic acid (0.4 ml) was stirred at 90° C. for 2 hours. Water was added thereto and the mixture was extracted with ethyl acetate. The organic layer was washed with water, dried over sodium sulfate and concentrated under reduced pressure. The resulting residue was subjected to silica gel column chromatography (hexane:ethyl acetate=1:1) to obtain 50 mg of the desired product as a white crystal.

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