N-2-Selective gold-catalyzed alkylation of 1-sulfonyl-1,2,3-trizoles

An efficient new method was developed to synthesise N-2-alkyl-1,2,3-trizoles via gold catalyzed alkylation of 1-sulfonyl-1,2,3-trizoles with vinyl ethers. Only N-2-isomers were obtained in these reactions. The sulfonyl group in the 1-sulfonyl-1,2,3-trizoles acted as the leaving group, which was trapped by H2O in this reaction.