Water → 4-(2,2-Dimethyl-propoxy)-1H-indole-2-carboxylic acid

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Reaction Steps

4-(2,2-Dimethyl-propoxy)-1H-indole-2-carboxylic acid methyl ester 90 (270 mg, 1.03 mmol) is dissolved in 20 ml of THF. A 2M-solution of LiOH in water (5.2 ml, 11 mmol) is added and the mixture is stirred for 48 hours. The solvent is then evaporated and the residue is partitioned between water and ether. The water layer is acidified with HCl and extracted twice with EtOAc. The combined organic layers are washed with brine, dried over anhydrous sodium sulfate, filtered and evaporated to give a yellow powder.

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