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Ketenimine intermediates generated by the addition of copper acetylides to sulfonyl azides are trapped by tetramethylguanidine to afford 1,4-dihydro-N,N-dimethyl-3-aryl(alkyl)-4-aryl(alkyl)sulfoniminoazet-2-amine derivatives in moderate to good yields.

The reaction between ketenimine intermediates, generated from terminal alkynes and sulfonyl azides, trichloroacetonitrile, and sodium arylsulfinates in N,N-dimethylformamide at room temperature affords N-[3-aryl(alkyl)-4-arylazet-2(1H)-ylidene]-arene(alkane)sulfonamides in moderate to good yields.

The synthesis of a novel class of bisamidines via a copper-catalyzed tandem reaction of trichloroacetonitrile, primary amines, sulfonyl azides, and terminal alkynes is described.

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