Volume 60, Issue 52 pp. 27164-27170
Research Article

Brønsted Acid Catalyzed Dearomatization by Intramolecular Hydroalkoxylation/Claisen Rearrangement: Diastereo- and Enantioselective Synthesis of Spirolactams

Peng-Fei Chen

Peng-Fei Chen

State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory of Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005 China

These authors contributed equally to this work.

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Bo Zhou

Bo Zhou

State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory of Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005 China

These authors contributed equally to this work.

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Peng Wu

Peng Wu

State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory of Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005 China

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Prof. Dr. Binju Wang

Prof. Dr. Binju Wang

State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory of Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005 China

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Prof. Dr. Long-Wu Ye

Corresponding Author

Prof. Dr. Long-Wu Ye

State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory of Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005 China

State Key Laboratory of Organometallic Chemistry, Shanghai, Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, 200032 China

State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071 China

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First published: 20 October 2021
Citations: 78

Dedicated to the 100th anniversary of Xiamen University

Graphical Abstract

A Brønsted acid catalyzed intramolecular hydroalkoxylation/Claisen rearrangement is disclosed that involves an unexpected dearomatization of nonactivated arenes and heteroaromatic compounds and allows the practical and atom-economic synthesis of various valuable spirolactams. Moreover, the asymmetric version of this tandem cyclization is also achieved via kinetic resolution by chiral phosphoric acid catalysis.

Abstract

Described herein is a novel Brønsted acid catalyzed intramolecular hydroalkoxylation/Claisen rearrangement, allowing the practical and atom-economic synthesis of a range of valuable spirolactams from readily available ynamides in generally good to excellent yields with excellent diastereoselectivities and broad substrate scope. Importantly, an unexpected dearomatization of nonactivated arenes and heteroaromatic compounds is involved in this tandem sequence. Moreover, an asymmetric version of this tandem cyclization was also achieved by efficient kinetic resolution by chiral phosphoric acid catalysis. In addition, the [3,3]-rearrangement is shown to be kinetically preferred over the related [1,3]-rearrangement by theoretical calculations.

Conflict of interest

The authors declare no conflict of interest.

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