Olefin-Supported Cationic Copper Catalysts for Photochemical Synthesis of Structurally Complex Cyclobutanes.

Christopher S Gravatt, Luis Melecio-Zambrano, Tehshik P Yoon

Angewandte Chemie (International ed. in English) 2021 Feb 19

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The sole method available for the photocycloaddition of unconjugated aliphatic alkenes is the Cu-catalyzed Salomon-Kochi reaction. The [Cu(OTf)]2 ⋅benzene catalyst that has been standard in this reaction for many decades, however, is air-sensitive, prone to photodecomposition, and poorly reactive towards sterically bulky alkene substrates. Using bench-stable precursors, an improved catalyst system with superior reactivity and photostability has been designed, and it offers significantly expanded substrate scope. The utility of this new catalyst for the preparation of sterically crowded cyclobutane structures is highlighted through the preparation of the cores of the natural products sulcatine G and perforatol. © 2020 Wiley-VCH GmbH.

Citation

Christopher S Gravatt, Luis Melecio-Zambrano, Tehshik P Yoon. Olefin-Supported Cationic Copper Catalysts for Photochemical Synthesis of Structurally Complex Cyclobutanes. Angewandte Chemie (International ed. in English). 2021 Feb 19;60(8):3989-3993