Visible Light Assisted Selenylative Intramolecular Dearomative Carbo‐Spirocyclisation (IDCS) of Homologated‐Ynones

A visible light assisted dearomative selenylative carbo‐spirocyclisation of aromatic homologated‐ynones has been reported. The ynones deliver selenylative spiro‐cyclohexadienones and spiro‐diepoxides at varied temperatures. The prescribed methodology is photo‐catalyst free and scalable. The combination of visible light, molecular oxygen and the products synthesized delivers a uniqueness to the designed methodology. A straightforward synthesis of selenylative carbo‐spirocyclisation from homologated‐ynones is presented trough visible light assisted intramolecular dearomatization. In the process, the substituted spiro‐triene‐2,8‐dione was readily transformed into various spiro‐cycles and substituted 2‐naphthols.