Volume 57, Issue 23 pp. 6915-6920
Communication

Highly Efficient and Stereoselective Thioallylation of Alkynes: Possible Gold Redox Catalysis with No Need for a Strong Oxidant

Dr. Jin Wang

Dr. Jin Wang

Department of Chemistry, University of South Florida, Tampa, FL, 33620 USA

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Shuyao Zhang

Shuyao Zhang

Department of Chemistry, University of South Florida, Tampa, FL, 33620 USA

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Chang Xu

Chang Xu

Department of Chemistry and Biochemistry, Ohio University, Athens, OH, 45791 USA

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Dr. Lukasz Wojtas

Dr. Lukasz Wojtas

Department of Chemistry, University of South Florida, Tampa, FL, 33620 USA

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Dr. Novruz G. Akhmedov

Dr. Novruz G. Akhmedov

C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, WV, 26506 USA

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Prof. Dr. Hao Chen

Prof. Dr. Hao Chen

Department of Chemistry and Biochemistry, Ohio University, Athens, OH, 45791 USA

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Prof. Dr. Xiaodong Shi

Corresponding Author

Prof. Dr. Xiaodong Shi

Department of Chemistry, University of South Florida, Tampa, FL, 33620 USA

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First published: 07 May 2018
Citations: 59

Graphical Abstract

Gentle as an ox: A broad range of alkynes underwent gold-catalyzed stereoselective thioallylation with high efficiency (low catalyst loading, high yields). The gold(I) catalyst acts as both a π-acid for alkyne activation and a redox catalyst for AuI/III coupling, while the sulfonium cation generated in situ functions as a mild oxidant (see scheme).

Abstract

Stereoselective thioallylation of alkynes under possible gold redox catalysis was accomplished with high efficiency (as low as 0.1 % catalyst loading, up to 99 % yield) and broad substrate scope (various alkynes, inter- and intramolecular fashion). The gold(I) catalyst acts as both a π-acid for alkyne activation and a redox catalyst for AuI/III coupling, whereas the sulfonium cation generated in situ functions as a mild oxidant. This novel methodology provides an exciting system for gold redox catalysis without the need for a strong oxidant.

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