| Abstract
| - A series of dendritic ligands with a 2,2‘-bipyridine core was synthesized through the coupling of 4,4‘-dihydroxy-2,2‘-bipyridine with poly(aryl ether) dendrons. The corresponding dendritic Cu(OTf)2 catalystswere used for Diels−Alder and three-component condensation reactions. The dendritic Cu(OTf)2-catalyzedDiels−Alder reaction proceeded smoothly, and these dendritic catalysts could be recycled withoutdeactivation by reprecipitation. Three-component condensation reactions such as Mannich-type reactionsalso proceeded not only in dichloromethane but also in water. Furthermore, a positive dendritic effect onchemical yields was observed in both Diels−Alder reactions and aqueous-media three-componentcondensation reactions.
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