Research Progress on Cucurbit[8]Uril-Catalyzed Photoinduced[2+2]Cycloaddition Reaction
The photoinduced[2+2]cycloaddition reaction is a classic reaction in organic chemistry textbooks.It can construct two new C—C bonds in one step,generating high-tension cyclobutane compounds containing four stereocentres.In recent years,a number of studies have demonstrated that cucurbit[8]uril,a distinctive macrocyclic compound,exhibits remarkable catalytic performance in photoinduced[2+2]cycloaddition reactions.Cucurbit[8]uril not only enhances the rate and extent of photoinduced[2+2]cycloaddition reaction,but also controls the spatial arrangement of the reaction substrates due to its cavity structure,which enables the selective binding of guest molecules,thereby rendering the reaction stereoselective.This article presents a summary of the research progress made in the field of catalytic photoinduced[2+2]cycloaddition reactions using cucurbit[8]uril.It also discusses the potential of host-guest interactions in controlling chemical reaction pathways and product selectivity.
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