Abstract
A green radical synthesis method for pyranopyrazole scaffolds catalyzed by a PCET (proton-coupled electron transfer) photocatalyst in an aqueous media in an air environment, at rt, and under a blue LED as a renewable energy source. The goal of this effort is the use of novel, widely available, and affordable donor-acceptor (D-A) fluorophores. The rapid and easy-to-use photocatalyst based on carbazoles; (4CzIPN) produces excellent results, uses little energy, and safeguards the environment. This makes it feasible to study the historical evolution of the environment and its chemical constituents. Gram-scale cyclization further indicates suitability for industrial applications.
Graphical Abstract
Radical Knoevenagel-Michael cyclo condensation reactions were used to create pyranopyrazole scaffolds. The proton-coupled electron transfer method of photosynthesis was employed to catalyze the reaction utilizing the novel donor-acceptor fluorophore; 4CzIPN. A renewable energy source using blue LED in an aqueous medium is used at room temperature and in an air environment.
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We gratefully acknowledge financial support from the Research Council of the Apadana Institute of Higher Education.
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Mohamadpour, F. Carbazole-based photocatalyst (4CzIPN) as a novel donor-acceptor fluorophore-catalyzed visible-light-induced photosynthesis of dihydropyrano[2,3-c]pyrazole scaffolds via a proton-coupled electron transfer process. J Chem Sci 135, 74 (2023). https://doi.org/10.1007/s12039-023-02204-y
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DOI: https://doi.org/10.1007/s12039-023-02204-y