Hydrochloric Acid → methyl 3-cyclohexyl-2-[2-(2-hydroxyethoxy)-3-nitrophenyl]-1H-indole-6-carboxylate

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Reaction Steps

To a solution of methyl 3-cyclohexyl-2-{3-nitro-2-[2-(tetrahydropyran-2-yloxy)ethoxy]phenyl}-1H-indole-6-carboxylate (6.48 g, 18.6 mmol) in tetrahydrofuran (30 ml) and methanol (90 ml) was added 6N hydrochloric acid (15 ml), and the mixture was stirred at room temperature for 1 hr. The reaction mixture was neutralized with 4N aqueous sodium hydroxide solution (22.5 ml), saturated aqueous sodium hydrogen carbonate solution was added, and the mixture was extracted with ethyl acetate. The organic layer was washed with saturated brine and dried over anhydrous magnesium sulfate. After filtration, the solvent was evaporated under reduced pressure, and the residue was purified by silica gel chromatography (hexane:ethyl acetate=3:1-2:1) to give methyl 3-cyclohexyl-2-[2-(2-hydroxyethoxy)-3-nitrophenyl]-1H-indole-6-carboxylate (11.00 g, yield 91%).

Provenance & Evidence