ethyl 7-nitro-5-(trifluoromethoxy)-1H-indole-2-carboxylate → ethyl 7-amino-5-(trifluoromethoxy)-1H-indole-2-carboxylate

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Reaction Steps

A mixture of ethyl 7-nitro-5-(trifluoromethoxy)-1H-indole-2-carboxylate (3.06 g), 10% palladium-carbon (50% containing water, 600 mg) and tetrahydrofuran (150 mL) was subjected to catalytic reduction under hydrogen atmosphere at normal pressure. The palladium-carbon was removed by filtration, and the filtrate was concentrated. The obtained crystals were washed with hexane to give the title compound (2.63 g, yield 95%) as colorless crystals. The crystals were recrystallized from ethyl acetate-hexane to give colorless prism crystals. melting point 190-191° C.

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