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The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
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Copper-Catalyzed Triyne Cyclization via Vinyl Cations.

Chen Luo1, Yan-Xin Zheng1, Sheng-Biao Ji1

  • 1Key Laboratory of Chemical Biology of Fujian Province and State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.

Organic Letters
|March 27, 2025
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Summary
This summary is machine-generated.

This study presents a copper-catalyzed reaction forming polycyclic pyrroles from triynes. This efficient method creates three rings in one step under mild conditions, offering a new synthetic route.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Methodology

Background:

  • Cyclization reactions are fundamental in organic synthesis.
  • Pyrrole derivatives are important scaffolds in medicinal chemistry and materials science.
  • Efficient construction of polycyclic systems remains a challenge.

Purpose of the Study:

  • To develop a novel copper-catalyzed method for synthesizing polycyclic pyrroles.
  • To achieve atom-economical and practical synthesis via triyne cyclization.
  • To explore the mechanism and potential for asymmetric synthesis.

Main Methods:

  • Copper-catalyzed cyclization of triynes.
  • Investigation of vinyl cation intermediates.
  • Analysis of reaction mechanism and regioselectivity.

Main Results:

  • Efficient synthesis of valuable polycyclic pyrroles.
  • Construction of three new rings in a single step.
  • Mild reaction conditions and high atom economy.
  • Demonstration of ordered and regioselective alkyne reactions.
  • Evidence for potential asymmetric cyclization.

Conclusions:

  • The developed copper-catalyzed cyclization is an effective route to polycyclic pyrroles.
  • The reaction proceeds through a proposed ordered and regioselective mechanism.
  • This methodology offers a practical and atom-economical approach to complex heterocyclic synthesis.
  • The potential for asymmetric catalysis opens new avenues for chiral pyrrole synthesis.