Volume 137, Issue 8 e202423405
Zuschrift

Building Three-Dimensional Complexity by Intramolecular 2-Aminoallyl Cation−Diene (4+3) Cycloaddition

Lulu Shen

Lulu Shen

State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Frontiers Science Center for New Organic Matter, Nankai University, Tianjin, 300071 P. R. China

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Tianzhu Qin

Tianzhu Qin

State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Frontiers Science Center for New Organic Matter, Nankai University, Tianjin, 300071 P. R. China

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Chongling Jiao

Chongling Jiao

State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Frontiers Science Center for New Organic Matter, Nankai University, Tianjin, 300071 P. R. China

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Prof. Dr. Weiwei Zi

Corresponding Author

Prof. Dr. Weiwei Zi

State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Frontiers Science Center for New Organic Matter, Nankai University, Tianjin, 300071 P. R. China

Haihe Laboratory of Sustainable Chemical Transformations, Tianjin, 300071 China

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First published: 14 January 2025

Abstract

Reliable methods for rapidly constructing C(sp3)-rich three-dimensional polycycles are in high demand for organic synthesis and medicinal chemistry. Although there are various mature systems for synthesizing five- or six-membered polycycles, a catalytic platform for accessing diverse cycloheptanoid-containing polycyclic scaffolds is lacking. Herein, we describe a method for copper-catalyzed intramolecular 2-aminoallyl cation−diene (4+3) cycloaddition reactions. By using 1,3-diene-tethered ethynyl methylene cyclic carbamates as substrates, we were able to construct various cycloheptanoid-containing polycyclic scaffolds, which are present in many bioactive molecules. The cycloaddition products were rich in functionality that could undergo various chemical transformations. The synthetic utility of the method was illustrated by total synthesis of the natural products (±)-mint ketone and (±)-aphanamol I. Mechanistic studies indicated that the cycloadditions proceed by a concerted [4π+2π] mechanism and that an endo-selective pathway is favored.

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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