Visible-Light-Induced I₂-Mediated Cyclization of ortho-Biarylchalcones of Naphthofuran Series toward Oxa[5]helicenes

Abstract

This work presents a novel, eco-friendly, transition metal-free method for synthesizing oxa[5]helicenes via visible-light-induced photocyclization of ortho-biarylchalcones of naphthofuran series. It was found that the obtained compounds are highly stable to both UV (365 nm) and visible light (LED420) irradiation in the presence of atmospheric oxygen or molecular iodine.

Keywords

Photochemistry - Heterocycles - Biarylchalcones - Naphthofuran - Photocyclization - Mallory reaction - Helicenes

Publication History

Received: 15 May 2025

Accepted after revision: 25 June 2025

Accepted Manuscript online:
25 June 2025

Article published online:
07 August 2025

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