An Overview of 4‐ and 5‐Halo‐1,2,3‐triazoles from Cycloaddition Reactions
José Laxio Arenas, Benoı̂t Crousse
Abstract
Abstract 1,2,3‐triazoles are important scaffolds in several fields, and there is still a demand to construct these compounds, most notably the disubstituted 4, 5 compounds. The latter are obtained in different ways, but the 4‐ and 5‐halo triazoles are generally the key intermediates in their synthesis. These halogenated compounds are an extraordinary platform leading to a great chemical diversity around the 4 and 5 positions. However, their own pathways are generally put aside at the expense of the substituted triazoles. This review is focused on the main synthesis of 5‐ and 4‐halo 1,2,3‐triazoles from cycloaddition followed or not by halogenation reaction. Unlike the halogens (iodine, bromine, and chlorine), the 5‐ and 4‐fluoro 1,2,3‐triazoles will be presented separately due to their relatively more difficult and still recently challenging synthesis.