Acetic Acid → 5-Methoxy-4,6,7-trimethylindole-2-carboxylic acid

Participants

Reaction Steps

A solution of ethyl 5-methoxy-4,5,7 trimethylindole-2-carboxylate (PREPARATION 19, 1.04 g) in ethanol (30 ml) containing potassium hydroxide (45%, 2.5 ml) is heated under reflux for 1.5 hr. The mixture is acidified with acetic acid (2 ml) and concentrated under reduced pressure. The residue is mixed with water (200 ml) and filtered. The filter cake is washed with water and dried to give the title compound.

Provenance & Evidence