PYRROLOTRIAZOLES
Keywords:
Chichibabin reaction, condensation, DFT calculation, dye coupling, ring transformation, tautomerismAbstract
This article summarizes the chemistry of the above pyrrolotriazole systems, covering the literature from the early 1970s to the early 2020s. Emphasis is placed on preparative aspects. Ring-fused derivatives of A–C are considered as well, except for benzo-fused examples (i.e. triazoloindoles and -isoindoles) that will be reviewed separately. Theoretical work, e.g. on annular tautomerism, is dealt with in addition.