Synthesis of sulfur- and oxygen-bridged cationic [4]-helicenes mediated by Friedel–Crafts-SNAr tandem reactions for red-light-driven organophotoredox catalysis

Ryoga Hasebe; Rumi Hanada; Yuta Tanaka; Yuta Goto; Mio Takeuchi; Hiroyoshi Takamura; Isao Kadota; Kenta Tanaka; Yujiro Hoshino

doi:10.1039/D5CC07398G

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Synthesis of sulfur- and oxygen-bridged cationic [4]-helicenes mediated by Friedel–Crafts-S_NAr tandem reactions for red-light-driven organophotoredox catalysis

Ryoga Hasebe,^a Rumi Hanada,^a Yuta Tanaka,^a Yuta Goto,^b Mio Takeuchi,^a Hiroyoshi Takamura,

^b Isao Kadota,*^b Kenta Tanaka

*^c and Yujiro Hoshino

*^a

Author affiliations

* Corresponding authors

^a Graduate School of Environment and Information Sciences, Yokohama National University, Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
E-mail: hoshino-yujiro-hy@ynu.ac.jp

^b Graduate School of Environmental, Life, Natural Science and Technology, Okayama University, 3-1-1 Tsushima-Naka, Kitaku, Okayama 700-8530, Japan
E-mail: kadota-i@okayama-u.ac.jp

^c Research Institute for Interdisciplinary Science, Okayama University, 3-1-1 Tsushima-Naka, Kitaku, Okayama 700-8530, Japan
E-mail: ktanaka@okayama-u.ac.jp

Abstract

The synthesis of sulfur- and oxygen-bridged cationic [4]-helicenes via a tandem Friedel–Crafts–S_NAr reaction of a diaryl sulfide or a diaryl ether with a (thio)salicylic acid has been developed. The sulfur-bridged cationic [4]-helicenes are suitable as catalysts for photoredox reactions under low-energy light sources such as red LED light.

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Article information

DOI: https://doi.org/10.1039/D5CC07398G
Article type: Communication
Submitted: 29 Dec 2025
Accepted: 28 Mar 2026
First published: 30 Mar 2026
This article is Open Access

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Chem. Commun., 2026, Advance Article

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Synthesis of sulfur- and oxygen-bridged cationic [4]-helicenes mediated by Friedel–Crafts-S_NAr tandem reactions for red-light-driven organophotoredox catalysis

R. Hasebe, R. Hanada, Y. Tanaka, Y. Goto, M. Takeuchi, H. Takamura, I. Kadota, K. Tanaka and Y. Hoshino, Chem. Commun., 2026, Advance Article , DOI: 10.1039/D5CC07398G

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Chemical Communications

Synthesis of sulfur- and oxygen-bridged cationic [4]-helicenes mediated by Friedel–Crafts-S_NAr tandem reactions for red-light-driven organophotoredox catalysis

Abstract

Supplementary files

Article information

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Synthesis of sulfur- and oxygen-bridged cationic [4]-helicenes mediated by Friedel–Crafts-S_NAr tandem reactions for red-light-driven organophotoredox catalysis

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