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Incorporation of a molecular hinge into molecular tweezers by using tandem cycloadditions onto 5,6-dimethylenenorbornene

Site-selective 1.3-dipolar coupling at the norbornene pi -bond of 5,6-dimethylenenorbornene I yields cycloadducts with an end-fused 1.3-diene system which have been reacted with N=N (or C=C) dienophiles to produce ribbon molecules. in which the internal diazacyclohexene (or cyclohexene) subunits are capable of acting as conformational hinges. Direct coupling of 5,6-dimethylene- norbornene with 1.3,4-oxadiazoles or dual coupling with bis(cyclobutene epoxides) afforded bis(1,3-dienes) that diastereoselectively react with dienophiles to produce new. conformationally mobile. molecular tweezers.

conformational mobility; crown compounds; cycloaddition; molecular modeling; phthalazine diones

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