Radical Cascade Combining Cross-Olefin Coupling with the Smiles-Truce Rearrangement.

Area of Science:

• Organic Chemistry
• Catalysis
• Synthetic Methodology

Background:

• Radical cascade reactions are powerful tools for constructing complex molecules efficiently.
• Developing new cascade reactions from readily available starting materials with native functionalities is crucial for synthetic chemistry.

Purpose of the Study:

• To develop a novel cascade reaction for the selective combination of two alkene starting materials.
• To form three new bonds in a single synthetic step.
• To synthesize α,γ-diarylated amides via a Smiles-Truce rearrangement.

Main Methods:

• Initiation via catalytic hydrogen atom transfer from a cobalt catalyst to a styrene double bond.
• Giese-addition of the resulting carbon-centered radical to N-sulfonyl acrylamides.
• Triggering a radical cascade reaction to yield the desired products.

Main Results:

• A new cascade reaction was developed that selectively combines two alkene starting materials.
• The reaction forms three new bonds in a single step.
• α,γ-diarylated amides with sterically hindered aryl substituents were synthesized under mild conditions.

Conclusions:

• The developed radical cascade reaction provides a swift and efficient route to complex organic molecules.
• The methodology is valuable for constructing sterically hindered aryl-substituted amides.
• This transformation offers a mild and effective approach in synthetic organic chemistry.