Tandem C–N coupling/Boulton–Katritzky rearrangement reactions of 3-aminoisoxazoles or 1, 2, 4-oxadiazol-3-amines with 2-pyridyl trifluoromethanesulfonate: a rapid access to [1, 2, 4]triazolo[1, 5-a]pyridines. Issue 13 (24th May 2022)