A method for the construction of heterocyclic scaffold 2,3-dihyro-1H-pyrrolo[1,2-a]indoles via aryl sulfonyl radical triggered cascade cyclization of unactivated alkene-tethered indoles in the absence of any external photocatalyst has been developed. This protocol features easily accessible starting materials such as sodium metabisulfite and aryldiazonium tetrafluoroborates at room temperature and offers good functional group compatibility, enabling the introduction of various functionalized sulfonyl and azo groups into pyrrolo[1,2-a]indoles.

I am Pawan Kumar working under the guidance of Dr. Utpal Das at CSIR-National Chemical Laboratory, Pune, India. I have designed and synthesized the novel sulfone containing organic valuable molecules by the designing the new methods.