Iridium-catalyzed enantioselective allyl-allylsilane cross-coupling

Area of Science:

• Organic Chemistry
• Catalysis
• Synthetic Methodology

Background:

• Allyl-allylsilane cross-coupling is a valuable synthetic transformation.
• Developing enantioselective variants is crucial for synthesizing chiral molecules.
• Racemic allylic substrates present a significant challenge in asymmetric catalysis.

Purpose of the Study:

• To report a novel enantioselective allyl-allylsilane cross-coupling reaction.
• To utilize a specific iridium catalyst for high regio- and stereoselectivity.
• To demonstrate the method's utility in synthesizing valuable compounds.

Main Methods:

• Employing an iridium-(P,olefin) phosphoramidite complex as the catalyst.
• Utilizing racemic branched allylic alcohols and allylsilanes as substrates.
• Performing the cross-coupling under operationally simple conditions.

Main Results:

• Achieved high regio- and stereoselectivity in the cross-coupling reaction.
• Demonstrated the catalytic efficiency of the iridium complex.
• Successfully synthesized the pyrethroid insecticide protrifenbute in a concise manner.

Conclusions:

• The developed iridium-catalyzed enantioselective allyl-allylsilane cross-coupling is a powerful synthetic tool.
• The method offers a practical route to chiral molecules from racemic starting materials.
• This approach provides an efficient synthesis of protrifenbute, highlighting its potential applications.