Synthesis of 2H-Indazoles via Lewis Acid Promoted Cyclization of 2-(Phenylazo)benzonitriles
摘要:
Lewis-acid promoted "coarctate" cyclization of 10 2-(phenylazo) benzonitrile derivatives furnishes the isoindazole ring system in ca. 65-95% yield. A plausible mechanism for this unusual transformation is proposed.