Synthesis of Azacarbolines via PhIO2‑Promoted Intramolecular Oxidative Cyclization of α‑Indolylhydrazones
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An unprecedented synthesis of polysubstituted indole-fused pyridazines (azacarbolines) from α-indolylhydrazones under oxidative conditions using a combination of iodylbenzene (PhIO2) and trifluoroacetic acid (TFA) has been developed. This transformation is conducted without the need for transition metals, harsh conditions, or an inert atmosphere.
