Organophotocatalytic Oxidative Annulation of Phosphoryl Arylhydrazones to Access Indazoles

The present work documents organophotocatalytic transformation of N‐phosphorylated arylhydrazones into indazoles. The strategy relies on the visible light‐mediated generation of N‐centered radical intermediate. The reaction employs organic dye as a photocatalyst and air as a terminal oxidant. The mild conditions, operational simplicity and fairly general scope are the notable attributes of the methodology.