Hydrochloric Acid → methyl 4-amino-1-ethyl-1H-indole-6-carboxylate hydrochloride

Participants

Reaction Steps

To a solution of methyl 4-amino-1H-indole-6-carboxylate (D201) (900 mg, 4,74 mmol, 1 equiv) in DMF (25 ml) at room temperature was added NaH (60% dispersion in mineral oil, 200 mg, 5 mmol, 1.05 equiv) and after 15 min ethyl iodide (400 μl, 5 mmol, 1.05 equiv). The resulting mixture was stirred for 30 min then most of the solvent was removed in vacuo. The residue was diluted with AcOEt and the organic phase was washed with a 2N aqueous HCl solution, dried over MgSO4 and concentrated in vacuo. Purification of the residue by flash chromatography on silica gel (iso-hexane/AcOEt: 1/1) gave an oil which was diluted with Et2O and treated with a 4N HCl solution in Et2O. The precipitate obtained was filtrated off to give methyl 4-amino-1-ethyl-1H-indole-6-carboxylate hydrochloride salt (D202) (800 mg, 66%) as a white solid. [M+H]+=219.0, RT=2.50 min.

Provenance & Evidence