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A metal‐free, visible‐light‐promoted direct difunctionalization of alkynoates was achieved under mild conditions. By employing catalytic quantities of the commercially available Eosin Y (EY) as the photocatalyst and tert‐butyl‐hydroperoxide (TBHP) as the oxidant, we developed a radical tandem phosphorylation/cyclization reaction to synthesize various 3‐phosphorylated coumarins with high functional group tolerance, moderate to good yields, and excellent regioselectivities. magnified image
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Liú et al. (2017) studied this question.
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