Visible-Light-Mediated Catalyst-Free [2+2] Cycloaddition Reaction for Dihydrocyclobuta[b]naphthalene-3,8-diones Synthesis under Mild Conditions

A facile and efficient visible-light-mediated method for directly converting 1,4-naphthoquinones into dihydrocyclo-buta[b]naphthalene-3,8-diones Stove Burner Cap (DHCBNDOs) under mild and clean conditions without using any photocatalysts is reported.This approach exhibited favorable compatibility with functional groups and afforded a series of DHCBNDOs with excellent regioselectivity and high yields.Moreover, detailed mechanism studies were carried out both experimentally and theoretically.The readily accessible, low-cost and ecofriendly nature of the Wooden Dollhouse developed strategy will endow it with attractive applications in organic and medicinal chemistry.

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