Abstract
AbstractA synthesis of 2‐aminoindazole and 2,2′‐biindazole derivatives from corresponding hydrazones using phenyliodine(III) diacetate (PIDA) as oxidant is reported at ambient temperature. This oxidative intramolecular cyclization reaction proceeds through the formation of the N−N bond. This protocol is metal‐free, operationally simple, has a short reaction time, and proceeds in ethyl acetate (preferred green solvent). Indazole core moieties are well established for their biological activity similarly 2‐aminoindazoles may also possess biological significance. A plausible reaction pathway has been reported based on a few control experiments.
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