Volume 56, Issue 12 pp. 3221-3225
Communication

Palladium-Catalyzed Oxidative Cascade Carbonylative Spirolactonization of Enallenols

Dr. Youai Qiu

Dr. Youai Qiu

Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, 10691 Stockholm, Sweden

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Bin Yang

Bin Yang

Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, 10691 Stockholm, Sweden

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Dr. Tuo Jiang

Dr. Tuo Jiang

Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, 10691 Stockholm, Sweden

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Dr. Can Zhu

Dr. Can Zhu

Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, 10691 Stockholm, Sweden

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Prof. Dr. Jan-E. Bäckvall

Corresponding Author

Prof. Dr. Jan-E. Bäckvall

Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, 10691 Stockholm, Sweden

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First published: 17 February 2017
Citations: 44

Graphical Abstract

All together now: A highly selective cascade reaction for C−C/C−O bond formation through palladium-catalyzed oxidative carbonylation/carbocyclization/alkoxycarbonylation of enallenols was developed, affording spirolactones bearing an all-carbon quaternary center. Preliminary attempts to obtain enantioselectivity in the carbonylative carbocyclization revealed that the VAPOL-type chiral phosphoric acid serves as a good anionic co-catalyst in this transformation.

Abstract

A highly selective palladium-catalyzed oxidative carbonylation/carbocyclization/alkoxycarbonylation of enallenols to afford spirolactones bearing an all-carbon quaternary center was developed. This transformation involves the overall formation of three C−C bonds and one C−O bond through a cascade insertion of carbon monoxide (CO), an olefin, and CO. Preliminary experiments on chiral anion-induced enantioselective carbonylation/carbocyclization of enallenols afforded spirolactones with moderate enantioselectivity.

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