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The reaction begins with the nucleophilic addition between a phosphorus ylide and the carbonyl compound. Due to its carbanionic character, phosphorus ylide acts as a strong nucleophile and attacks the electrophilic carbonyl group. This generates a charge-separated dipolar intermediate called betaine. The negatively charged oxygen atom and...

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Related Experiment Video

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Facile Preparation of (2Z,4E)-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate

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Intercepting Wacker intermediates with arenes: C-H functionalization and dearomatization.

Bryan S Matsuura¹, Allison G Condie, Ian A McBee

¹Department of Chemistry, Boston University, Boston, Massachusetts 02215, USA.

Organic Letters

|November 11, 2011

Summary

A novel palladium-catalyzed reaction creates complex tricyclic molecules through intramolecular cyclization. This efficient method rapidly synthesizes functionalized scaffolds, including spirocyclic cyclohexadienones, under mild conditions.

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Facile Preparation of (2Z,4E)-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate

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Area of Science:

Organic Chemistry
Catalysis
Synthetic Methodology

Background:

Palladium catalysis is crucial for C-C and C-O bond formation.
Developing efficient routes to complex scaffolds like spirocyclic cyclohexadienones remains a challenge.

Purpose of the Study:

To develop a novel intramolecular cyclization cascade reaction.
To synthesize highly functionalized tricyclic scaffolds, including spirocyclic cyclohexadienones.

Main Methods:

Utilizing a high-valent palladium intermediate.
Employing a single transformation to form C-C and C-O bonds.

Main Results:

Rapid access to highly functionalized tricyclic scaffolds.
Successful synthesis of spirocyclic cyclohexadienones.
Achieved good yields under mild conditions.

Conclusions:

The developed method offers an efficient route to complex molecular architectures.
The reaction exhibits high tolerance to oxygen and water, simplifying experimental procedures.