Abstract
A green radical synthetic approach for the production of tetrahydrobenzo[b]pyran scaffolds, which utilizes a Knoevenagel–Michael cyclocondensation reaction of aldehydes, malononitrile, and dimedone, has been devised. This innovative technique has been designed to achieve environmental sustainability. A novel single-electron transfer photocatalyst was employed for the synthesis in an aqueous ethanol solution under an air atmosphere at room temperature and stimulated with blue LED illumination serving as a renewable energy source. The objective of this undertaking is to cultivate a metal-free donor–acceptor (D–A) photocatalyst that is highly affordable and universally accessible. 9-Mesityl-10-methylacridinium perchlorate (Mes-Acr-Me+ClO4−) is recognized for its expeditious and effortless applicability, high efficiency in yielding products, low energy consumption, and commendable eco-friendliness. This capability facilitates the investigation into the temporal alterations of environmental and chemical constituents. A research inquiry was conducted with the primary objective of determining the turnover number and turnover frequency associated with tetrahydrobenzo[b]pyran scaffolds. Furthermore, the attainment of cyclization at a gram-scale level offers substantiation for its feasibility as a viable solution for industrial implementation.
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Acknowledgements
This work is financially supported by Iran National Science Foundation (INSF) (No. 4015618), financially supported by Iran’s National Elites Foundation (No. 4015618), and also, Shiraz University of Medical Sciences.
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F.M. and H.K. and Sh.Ch. and A.M.A. wrote the main manuscript text and F.M. and H.K. and Sh.Ch. and A.M.A. prepared figures 1-4. All authors reviewed the manuscript.
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Mohamadpour, F., Kamyab, H., Chelliapan, S. et al. 9-mesityl-10-methylacridinium perchlorate (Mes-Acr-Me+ClO4−) as a novel metal-free donor–acceptor (D–A) photocatalyst: visible-light-induced access to tetrahydrobenzo[b]pyran scaffolds through a single-electron transfer (SET) pathway. Res Chem Intermed (2024). https://doi.org/10.1007/s11164-024-05304-7
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DOI: https://doi.org/10.1007/s11164-024-05304-7