ChemInform Abstract: Synthesis of Novel Dendritic 2,2′-Bipyridine Ligands and Their Application to Lewis Acid Catalyzed Diels—Alder and Three-Component Condensation Reactions
Autor: | Masato Kujime, Takahito Muraki, Ken-ichi Fujita |
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Rok vydání: | 2008 |
Předmět: | |
Zdroj: | ChemInform. 39 |
ISSN: | 1522-2667 0931-7597 |
Popis: | 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 catalysts were used for Diels−Alder and three-component condensation reactions. The dendritic Cu(OTf)2-catalyzed Diels−Alder reaction proceeded smoothly, and these dendritic catalysts could be recycled without deactivation by reprecipitation. Three-component condensation reactions such as Mannich-type reactions also proceeded not only in dichloromethane but also in water. Furthermore, a positive dendritic effect on chemical yields was observed in both Diels−Alder reactions and aqueous-media three-component condensation reactions. |
Databáze: | OpenAIRE |
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