Methylene blue as a photo‐redox catalyst employed for the synthesis of pyrano[2,3‐d]pyrimidine scaffolds via a single‐electron transfer/energy transfer pathway
Abstract:The radical tandem Knoevenagel‐Michael cyclocondensation reaction of barbituric acid/1,3‐dimethylbarbituric acid, malononitrile, and aryl aldehydes was used to establish a green tandem method for the metal‐free synthesis of pyrano[2,3‐d]pyrimidine scaffolds. At ambient temperature, photo‐excited state functions made from methylene blue (MB+) were used as single‐electron transfer and energy transfer catalysts in an aqueous solvent, utilizing visible light as a sustainable energy source. The purpose of this proj… Show more
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