Acylation of ethyl 2-amino-4-thiazolylacetate (I) with 3-chloro-2-methylbenzenesulfonyl chloride (II) in pyridine affords sulfonamide (III). After alkaline hydrolysis of the ethyl ester group of (III), the resultant carboxylic acid (IV) is coupled to N-methylpiperazine (V) by means of EDC to furnish the target amide.