Methanol → 1-Benzenesulfonyl-5-methylthioindole-2-carboxylic acid methyl ester

Participants

Reaction Steps

A mixture of 1-benzenesulfonyl-5-methylthioindole-2-carboxylic acid (3.5 g), sulfuric acid (10 ml) and methanol (10 ml) was heated under reflux for 12 hours. The reaction mixture was poured into ice-water and extracted with dichloromethane. The organic layer was washed with water, dried over sodium sulfate and concentrated under reduced pressure. The resulting residue was subjected to silica gel column chromatography (dichloromethane) to obtain 3.4 g of the desired product as a white crystal.

Provenance & Evidence