Abstract
AbstractUtilizing readily accessible 2‐arylbenzyl methyl ethers as precursors, an unprecedented three reactions in one‐pot protocol for the synthesis of benzo[c]coumarins over heterogeneous visible‐light photoredox catalysis with graphitic carbon nitride (g‐C3N4) has been developed. Also, a possible reaction mechanism has been explored. Upon irradiation, g‐C3N4 converts molecular oxygen into superoxide radical anion, which facilitates the benzylic oxidation of 2‐arylbenzyl methyl ethers into methyl [1,1′‐biaryl]‐2‐carboxylate. The required benzo[c]coumarins are then produced through the hydrolysis and dehydrogenative lactonization of methyl [1,1′‐biaryl]‐2‐carboxylate. The main attributes of this transformation include mildness, convenience in catalyst recovery and reuse, compatibility with lithium persulfate produced from the spent lithium‐ion batteries, works in aqueous medium, and is a multiple C−H functionalization processes happen via three reactions (oxidation, hydrolysis and dehydrogenative lactonization) in one‐pot at ambient conditions.
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