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Updated: May 30, 2026

Efficient Synthesis of All-Carbon Quaternary Centers via the Conjugate Addition of Functionalized Monoorganozinc Bromides
Published on: May 26, 2019
Conjugate addition-initiated Nazarov cyclization
Joshua L Brooks1, Patrick A Caruana, Alison J Frontier
1Department of Chemistry, University of Rochester, Rochester, New York 14627, United States.
This study details a reaction sequence starting with nucleophile addition to a dienyl diketone, followed by Nazarov cyclization. Different outcomes arise based on nucleophile quantity, impacting the reaction pathway.
Area of Science:
- Organic Chemistry
- Synthetic Chemistry
Background:
- Conjugate addition reactions are fundamental in organic synthesis.
- Nazarov cyclization is a key electrocyclization for forming cyclopentenones.
Purpose of the Study:
- To describe a novel reaction sequence combining 1,6-conjugate addition and Nazarov cyclization.
- To investigate the role of nucleophiles in initiating and influencing this reaction sequence.
Main Methods:
- 1,6-conjugate addition of various nucleophiles to dienyl diketones.
- Nazarov cyclization triggered by nucleophile addition.
- Analysis of reaction products under different nucleophile concentrations (stoichiometric vs. catalytic).
Main Results:
- Several nucleophiles were found to effectively initiate the reaction sequence.
- Stoichiometric nucleophile addition led to successful conjugate addition and cyclization.
- Catalytic nucleophile use resulted in elimination of the nucleophile post-cyclization, altering the product.
Conclusions:
- The described reaction sequence provides a new route to complex cyclic structures.
- Nucleophile concentration is a critical factor determining the reaction's outcome and mechanism.
- This work expands the synthetic utility of dienyl diketones in organic chemistry.
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