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Highly Stereo- and Regioselective Hydrocarboxylation of Diynes with Carbon Dioxide. | LitMetric
A nickel-catalyzed three-component hydrocarboxylation of diynes with ZnEt2 and CO2 (1 atm) is disclosed. With this method, symmetric/nonsymmetric diynes could be reacted smoothly with very high stereo- and regioselectivity, affording conjugated 2,4-alkadienoic acids incorporated with five- or six-membered rings efficiently. A stepwise non-oxidative cyclometalation mechanism was proposed based on careful mechanistic studies.
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Kyoto University , Nishikyo-ku, Kyoto 615-8510, Japan.
Carbon dioxide (CO) is one of the most important materials as renewable chemical feedstock. In this review, the Co- and Rh-catalyzed transformation of CO via carbon-carbon bond-forming reactions is summarized. Combinations of metals (cobalt or rhodium), substrates, and reducing agents realize efficient carboxylation reactions using CO.
A nickel-catalyzed three-component hydrocarboxylation of diynes with ZnEt2 and CO2 (1 atm) is disclosed. With this method, symmetric/nonsymmetric diynes could be reacted smoothly with very high stereo- and regioselectivity, affording conjugated 2,4-alkadienoic acids incorporated with five- or six-membered rings efficiently. A stepwise non-oxidative cyclometalation mechanism was proposed based on careful mechanistic studies.
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