Abstract
A one-pot, two-step route is proposed for the synthesis of Benzopyrano[2,3-c]pyrazoles by using salicylaldehydes (1), malononitrile (2) and phenyl hydrazines (3) as substrates and Rhodamine-B as an organophotoredox catalyst in acetonitrile under 23 W CFL irradiation as a source of visible light. Rhodamine- B is a basic red xanthene dye which is extremely water soluble. The utilization of an efficacious, environmentally benign, cost effective and feasible methodology to form C–O and C–N bond via generation of several free radicals after that intramolecular cyclization, are the distinctive traits of this procedure. In addition to this, some other aspects like short reaction time, greener approach and adaptability towards a broad array of substrates, with good to excellent yield of the product further augment the synthesis.
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Acknowledgements
The authors are thankful to SAIF, Punjab University, Chandigarh, India for providing spectral data. Prof. Jagdamba Singh acknowledges the financial support from UGC, New Delhi in the form of BSR Faculty Fellowship (No. F.18-1/2011 (BSR))
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Mishra, A., Jaiswal, A., Sharma, A.K. et al. A Visible-Light-Triggered & Rhodamine-B Catalyzed Eco-friendly Synthesis of Benzopyrano[2,3-c]pyrazoles. Catal Lett 153, 3795–3804 (2023). https://doi.org/10.1007/s10562-023-04279-1
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DOI: https://doi.org/10.1007/s10562-023-04279-1