Organic Letters
Organic Letters
5 years ago

NbCl5/Zn/PCy3-System-Catalyzed Intramolecular [2 + 2 + 2] Cycloadditions of Diynes and Alkenes To Form Bicyclic Cyclohexadienes

NbCl5/Zn/PCy3-System-Catalyzed Intramolecular [2 + 2 + 2] Cycloadditions of Diynes and Alkenes To Form Bicyclic Cyclohexadienes
Hirohisa Furukawa, Maito Fuji, Yasushi Satoh, Yasushi Obora, Motofumi Kamei, Keisuke Watanabe
A NbCl5, Zn, and PCy3 catalytic system that generated low-valent Nb species is used for the synthesis of bicyclic cyclohexadienes from diynes and simple alkenes. A phosphine ligand is important for stabilizing low-valent Nb in the cycloaddition. The bicyclic cyclohexadiene skeleton is important in transition-metal-catalyzed intramolecular cycloadditions.

Publisher URL: http://dx.doi.org/10.1021/acs.orglett.7b02672

DOI: 10.1021/acs.orglett.7b02672

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