Article

Semi‑Heterogeneous Photoredox‑Catalyzed SO2‑Insertive Multicomponent Cascade Cyclization: DDQ as a Dual HAT/Redox Catalyst for Sulfonyl Phenanthrenes from 2‑Alkynyl Biaryls

  • Zi-Tong Zhang ,
  • Zhe Liao ,
  • Dan-Lu Hu ,
  • Rong-Nan Yi ,
  • Dong-Fang Jiang ,
  • Yu-Cai Tang ,
  • Li-Li Wang ,
  • Wei-Min He
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  • aSchool of Chemistry and Chemical Engineering, University of South China, Hengyang 421001;
    bKey Laboratory of Food & Environment & Drug Monitoring and Testing of Universities in Hunan Province, Hunan Police Academy, Changsha 410138;
    cHunan Provincial University Key Laboratory of the Fundamental and Clinical Research on Functional Nucleic Acid, Changsha Medical University, Changsha 410219;
    dCollege of Chemistry and Materials Engineering, Hunan University of Arts and Science, Changde 415000;
    eSchool of Chemical Engineering, Nanjing Forestry University, Nanjing 210037
#These authors contributed equally to this work

Received date: 2026-09-01

  Online published: 2026-09-17

Supported by

Hunan Provincial Natural Science Foundation (No. 2026JJ90135), the Scientific Research Fund of Hunan Provincial Education Department (No. 25A0703 and No.23B0411) and the Changsha Natural Science Foundation (No.104872)

Abstract

A semi-heterogeneous visible-light photocatalytic system has been developed for the direct construction of sulfonyl phenanthrenes via a multicomponent cascade sulfonylation/cyclization reaction. The protocol employs the inexpensive intrinsic semiconductor CW2 as a heterogeneous photocatalyst and DDQ as a bifunctional homogeneous organocatalyst, enabling the efficient coupling of 2-alkynyl biaryls, Na2S2O5 (as an inorganic SO2 surrogate), and aryldiazonium tetrafluoroborates under mild conditions. This redox-mediator-assisted semiconductor photocatalysis effectively suppresses photogenerated electron-hole recombination and enhances interfacial charge transfer, thus overcoming the intrinsic limitations of conventional single-component semiconductor photocatalysis. The reaction exhibits broad substrate scope with respect to both coupling partners, delivering a wide range of sulfonyl phenanthrenes in good to excellent yields. Importantly, the catalyst system is scalable to gram-level synthesis, and the CW2 photocatalyst can be readily recovered and reused without significant loss of activity. Mechanistic investigations reveal that DDQ plays a crucial dual role in the catalytic cycle: it acts as a HAT catalyst to facilitate phenanthrene ring formation, and simultaneously serves as a redox mediator to sustain the photocatalytic turnover of CW₂. This synergistic interplay between heterogeneous photon harvesting and homogeneous radical/redox mediation is the key to the high efficiency of the cascade process. The protocol offers distinct practical advantages, including the use of commercially available and low-cost catalysts, mild and operationally simple conditions, excellent functional-group tolerance, and catalyst recyclability. This dual-catalytic strategy provides a sustainable and versatile platform for the synthesis of valuable sulfonyl phenanthrenes, with promising potential for applications in medicinal chemistry and functional materials.

Cite this article

Zi-Tong Zhang , Zhe Liao , Dan-Lu Hu , Rong-Nan Yi , Dong-Fang Jiang , Yu-Cai Tang , Li-Li Wang , Wei-Min He . Semi‑Heterogeneous Photoredox‑Catalyzed SO2‑Insertive Multicomponent Cascade Cyclization: DDQ as a Dual HAT/Redox Catalyst for Sulfonyl Phenanthrenes from 2‑Alkynyl Biaryls[J]. Acta Chimica Sinica, 0 : 0 . DOI: 10.6023/A26090304

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