Acylation of anthranilate (I) with 4-(4-chlorophenoxy)phenylsulfonyl chloride (II) provided the sulfonamide (III). Subsequent alkylation of the sulfonamide N of (III) with iodomethane yielded the N-methyl derivative (IV). Selective ester hydrolysis of (IV) with NaOH afforded the carboxylic acid (V). This was finally converted to the target hydroxamic acid via activation with oxalyl chloride, followed by treatment with hydroxylamine.