Denitrogenation of 1,2,3-triazoles

NH-1,2,3-triazoles can be easily acylated on nitrogens and the products are isolable species. In the presence of acids these acylated triazoles underwent denitrogenation reactions via vinyl cation intermediates and capture of anion to form acylaminoketones, oxazoles, imidazoles, isothiocyanates, enamidotriflates, etc. (Chemical Communications  59: 9364, 2023, Organic & Biomolecular Chemistry  21: 1143, 2023, New Journal of Chemistry  46: 14318, 2022, Organic Letters  24: 1958, 2022).  We reviewed the denitrogenation pathways of NH-1,2,3-triazoles (RSC Advances 13: 34646, 2023).