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An Efficient and Facile Process for Synthesis of 4,5-Dichlorothiophene-2-Carboxylic Acid using N-Chlorosuccinimide

4,5-Dichlorothiophene-2-carboxylic acid was obtained from the starting material thiophene-2-carboxylic acid via esterification, chlorination and hydrolysis. The chlorination reaction was achieved using N-chlorosuccinimide as the chlorinating agent with high selectivity and yield. The advantages of this synthesis route were mild reaction conditions, simplified operational procedure and the raw materials were easy to obtain. It could be applied to industrial production.