Volume 63, Issue 13 e202317433
Communication

Diastereo- and Enantioselective Synthesis of Tetracyclic Cycloheptanols through (4+3) Annulation via C−C/C−H Activation Cascade

Xin Yan

Xin Yan

College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, Sichuan, China, 610066

These authors contributed equally to this work.

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Min Liu

Min Liu

College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, Sichuan, China, 610066

These authors contributed equally to this work.

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Deng Pan

Deng Pan

Department of Chemistry, School of Science and Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Tianjin University, Tianjin, China

These authors contributed equally to this work.

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Qi Wang

Qi Wang

College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, Sichuan, China, 610066

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Qi Tang

Qi Tang

College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, Sichuan, China, 610066

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Ya-Mei Dai

Ya-Mei Dai

College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, Sichuan, China, 610066

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Prof. Ping Hu

Prof. Ping Hu

College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, Sichuan, China, 610066

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Bi-Qin Wang

Bi-Qin Wang

College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, Sichuan, China, 610066

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Prof. Dr. Genping Huang

Corresponding Author

Prof. Dr. Genping Huang

Department of Chemistry, School of Science and Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Tianjin University, Tianjin, China

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Prof. Dr. Feijie Song

Corresponding Author

Prof. Dr. Feijie Song

College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, Sichuan, China, 610066

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First published: 12 December 2023
Citations: 1

Graphical Abstract

A Rhodium-catalyzed intramolecular (4+3) annulation of α-arylalkene–benzocyclobutenols has been developed, which proceeds through sequential β-carbon elimination of alcohols, migratory insertion with alkenes, 1,4-Rh shift, and nucleophilic addition to the in situ formed ketones. The protocol offers a diastereo- and enantioselective approach to dihydrofuran-annulated dibenzocycloheptanols with two discontinuous chiral carbon centers built.

Abstract

Transition metal-catalyzed annulations of four-membered rings via C−C activation are powerful tools to construct complex fused and bridged ring systems. Despite significant progress in (4+1), (4+2) and (4+4) annulations, the (4+3) annulation remains unexplored. Herein, we develop an asymmetric Rh-catalyzed intramolecular (4+3) annulation of α-arylalkene-tethered benzocyclobutenols for the synthesis of dihydrofuran-annulated dibenzocycloheptanols with two discontinuous chiral carbon centers via a C−C and C−H activation cascade. The reaction features excellent diastereo- and enantioselectivities and 100 % atom economy, and is applicable to late-stage modification of complex molecules.

Data Availability Statement

The data that support the findings of this study are available in the supplementary material of this article.

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