A convenient synthetic method for N-acylation of sulfonamides in the presence of P 2 O 5 /SiO 2 is described. Carboxylic acid anhydrides and carboxylic acid chlorides were used as acylating agents and the reactions were carried out in CH 2 Cl 2 or solventfree conditions. The catalyst can be recovered by simple filtration and can be used in the subsequent reactions.
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