Issa Yavari

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The reaction between ketenimine intermediates [generated from terminal alkynes and sulfonyl azides], diethyl azadicarboxylate, and sodium arylsulfinates in N, N-dimethylformamide at room temperature, affords ethyl 2,3-dihydro-3-oxo-4-phenyl-2-tosyl-5-(tosylamino)pyrazole-1-carboxylates in moderate-to-good yields. When diisopropyl azadicarboxylate was used(More)
The synthesis of a novel class of highly functionalized 1,3-thiazine derivatives via a copper-catalyzed tandem reaction of 1,1,3,3-tetramethylguanidine, $$\mathrm {CS}_{2}$$ CS 2 , sulfonyl azides, and terminal alkynes is described. Using isothiocyanates as the heterocumulene component, affords 2-arylimino-1,3-thiazine derivatives in moderate to good yields.
An efficient and experimentally simple copper-catalyzed carbon–nitrogen bond formation for the synthesis of $$N$$ N -arylated biguanides starting from aryl halides, carbodiimides, and 1,1,3,3-tetramethylguanidine is reported. The potential diversity of this type of reaction, easily available starting materials, and commercially available low-cost catalysts(More)
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