AbstractA facile method for the synthesis of pyrazoles bearing novel N‐sulfonyl and 5‐alkylthio functional substructures has been developed via the reactions of ketene dithioacetals and sulfonyl hydrazines. The reactions are conducted with simple p‐toluenesulfonic acid (p‐TSA) promotion and mild heating under air atmosphere, leading to the synthesis of target products with highly diverse functional substitution.