Indol-3-carbonsure

synthetischeindole-3-carboxylic acid can be synthesized by the hydrolysis reaction of 3-trichloroacetyl indole: add 235g 3-trichloroacetyl indole into 1000ml methanol, slowly drop an appropriate amount of 50% KOH solution, heat up and reflux for 18 hours, cool to room temperature, The methanol was recovered by concentration, and the residual liquid was left; 1500 ml of water was added to the residual liquid, hydrochloric acid was added dropwise to adjust pH=3～4, and then filtered, and the solid obtained by filtration was dried to obtain 144g of indole-3-carboxylic acid crude product; The crude product was slurried with 100g of ethyl acetate for 25 minutes,filtered and dried to obtain indole-3-carboxylic acid (137g, yield 91.8%).