Water → 5-(4-tert-Butylphenyl)-3-[(ethoxycarbonylmethylmethylamino)methyl]-1-(4-isopropoxyphenyl)indole-2-carboxylic acid ethyl ester

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Reaction Steps

N-Methyl glycine ethyl ester hydrochloride (255 mg, 1.66 mmol) was added to a suspension of 5-(4-tert-butylphenyl)-3-formyl-1-(4-isopropoxyphenyl)indole-2-carboxylic acid ethyl ester (400 mg, 0.83 mmol; see step (c) above) in MeOH (20 mL) and the pH was adjusted to 6 by the addition of a few drops of glacial acetic acid. After 1 h at rt, NaCNBH3 (75 mg, 1.18 mmol) was added and the mixture was stirred at rt for 24 h, poured into H2O and extracted with EtOAc. The combined extracts were washed with H2O and brine, dried (Na2SO4), concentrated and purified by chromatography to give the sub-title compound. Yield 400 mg (87%).

Provenance & Evidence