Silver-catalyzed [3+2] cycloaddition of isocyanides with diazo compounds: new regioselective access to 1,4-disubstituted-1,2,3-triazoles

An unprecedented silver-catalyzed 1,3-dipolar cycloaddition reaction of isocyanides with diazo compounds to afford 1,4-disubstituted 1,2,3-triazoles is reported. This reaction exhibits remarkable features, such as high regioselectivity, mild reaction conditions, easily available substrates with simple operation, and good yields with a broad spectrum of substrates. It constitutes an alternative to the well-known CuAAC click reaction.