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  • 1Department of Chemistry, St. Lawrence University, Canton, New York 13617, United States.

ACS Omega
|January 19, 2026
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Summary

The Wagner-Jauregg reaction, a Diels-Alder subtype, now offers lower-temperature, aqueous conditions for synthesizing complex molecules. Optimization enhances yields and selectivity, transforming it into a practical synthetic tool.

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry

Background:

  • The Wagner-Jauregg reaction, a Diels-Alder variant, forms multiple bonds and stereocenters but suffers from harsh conditions and low yields.
  • Limited research exists on improving its scope, conditions, or selectivity, hindering its synthetic utility.

Purpose of the Study:

  • To optimize the Wagner-Jauregg reaction conditions, including temperature, substrate scope, and solvent effects.
  • To investigate the factors controlling product selectivity between Diels-Alder and Diels-Alder-ene pathways.
  • To enhance the reaction's practicality as a synthetic tool.

Main Methods:

  • Reaction optimization through systematic variation of diene, dienophile, and solvent.
  • Density functional theory (DFT) calculations to understand reaction mechanisms and selectivity.
  • Exploration of lower-temperature and aqueous reaction media.

Main Results:

  • Discovery of milder, aqueous conditions for the Wagner-Jauregg reaction.
  • Achieved high selectivity for the Diels-Alder-ene cascade product, even with electron-poor dienes.
  • Demonstrated good yields and improved product selectivity through optimization.

Conclusions:

  • Optimized conditions significantly improve the Wagner-Jauregg reaction's efficiency and scope.
  • Understanding steric and electronic factors enhances control over [4 + 2]-cycloaddition selectivity.
  • The reaction is now a viable and practical tool for complex molecule synthesis.