Water → 7-(Cyclopentylamino)-2-phenyl-1H-indole-5-carboxylic acid

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Reaction Steps

7-(Cyclopentyl)amino-2-phenyl-1H-indole-5-carboxylic acid ethyl ester (5 g, 14.3 mmol) prepared in Example 28 was added to a solvent mixture of MeOH (20 mL) and water (20 mL). NaOH (1.3 g, 33.8 mmol) was added thereto, and the mixture was stirred for 4 h at room temperature. After completion of the reaction, MeOH was removed under reduced pressure, and 1N HCl was added to the residue. The resulting mixture was extracted with EtOAc, dried over anhydrous magnesium sulfate, and filtered. The solvent was removed under reduced pressure, and the residue was recrystallized from EtOAc and n-Hex to give the title compound.

Provenance & Evidence