Photochemical, Catalyst-Free [2+2] Cycloaddition of Coumarin-3-carboxylates with Alkenes
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Herein, we report a visible light-promoted, photocatalyst-free [2+2] photocycloaddition of coumarin-3-carboxylates with alkenes, resulting in an expeditious and efficient synthesis of cyclobutane-fused coumarins. The reaction was demonstrated on a gram scale a... ...
