We synthesized two 1,3,4,5-tetrasubstituted 1,2,3-triazolium salts, 3,4-diphenyl-5-methyl-1-(p-tolyl)-1H-1,2,3-triazolium triflate and 3,4-diphenyl-5-ethyl-1-(p-tolyl)-1H-1,2,3-triazolium triflate. The synthesis began with 4-aminotoluene, which was converted into 4-azidotoluene. A copper-catalyzed azide-alkyne cycloaddition was performed between it and phenylacetylene, resulting in 1,4-disubstituted-1,2,3-triazole. This compound was reacted with an iodonium salt in the presence of copper sulfate, resulting in a 1,3,4-trisubstituted 1,2,3-triazolium salt. In the final step, a methyl or ethyl group was attached at position 5 using n-butyl-lithium and corresponding alkyl iodide (methyl iodide or ethyl iodide), producing the respective products.
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