“…The 1,3a,6a-triazapentalene ( TAP ) has emerged as a new small molecule fluorophore over the past decade, − and the applications of some derivatives as probes or sensors have been recently explored. − In particular, triazapentalenes without an additional fused ring have been studied extensively by Namba et al, revealing interesting properties such as a large Stokes shift and strong positive solvatochromism. ,,− The synthetic methodology of Namba et al comprises a click–cyclization–aromatization domino reaction, using alkyl azides bearing two leaving groups, and leads to 3-unsubstituted (Scheme ) triazapentalenes. In this way, structural diversity resulted from the variation of terminal alkynes and the starting azide, which required a multistep synthesis.…”