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Updated: Feb 5, 2026
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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
Published on: July 17, 2020
Pd(II)-Catalyzed [4 + 2] Heterocyclization Sequence for Polyheterocycle Generation
Elizabeth L Glaisyer1, Michael S Watt1, Kevin I Booker-Milburn1
1School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , U.K.
A novel palladium-catalyzed cascade reaction efficiently synthesizes polyheterocycles from simple precursors. This method accommodates diverse indole and pyrrole substrates, showcasing broad applicability in organic synthesis.
Area of Science:
- Organic Chemistry
- Catalysis
- Heterocyclic Chemistry
Background:
- Palladium catalysis is crucial for C-H activation and C-N bond formation.
- Efficient synthesis of polyheterocycles remains a challenge in organic chemistry.
Purpose of the Study:
- To develop a new cascade sequence for polyheterocycle synthesis.
- To explore the scope and limitations of the reaction with various substrates.
Main Methods:
- Utilizing a palladium(II)-catalyzed cascade sequence.
- Employing C-H activated Heck reaction followed by aza-Wacker cyclization.
- Incorporating copper(II)-mediated palladium(0) turnovers.
Main Results:
- Successful formation of polyheterocycles from indole and pyrrole substrates.
- Tolerance of a wide range of substituents on the starting materials.
- The reaction proceeds via a formal [4 + 2] heterocyclization.
Conclusions:
- A new, efficient, and versatile method for synthesizing polyheterocycles has been established.
- The reaction mechanism involves sequential palladium-catalyzed steps.
- This cascade sequence offers a valuable tool for constructing complex heterocyclic scaffolds.
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