Copper-Catalyzed Divergent Rearrangement Reactions of Propargyl Ethers

Area of Science:

• Organic Synthesis
• Catalysis
• Synthetic Chemistry

Background:

• Rearrangement reactions are crucial for synthesizing high-value chemicals from simple precursors.
• Developing efficient and selective rearrangement methods remains a significant challenge in organic chemistry.

Purpose of the Study:

• To develop a novel Cu-catalyzed divergent rearrangement of propargyl ethers.
• To access indenes and benzofurans through distinct reaction pathways.
• To establish a method with broad functional group compatibility and mild conditions.

Main Methods:

• Copper-catalyzed rearrangement of propargyl ethers.
• Utilizing a 1,4-aryl migration-cyclization pathway to form indenes.
• Employing a [3,3]-σ-rearrangement pathway to form benzofurans.

Main Results:

• Successfully synthesized indenes and benzofurans from propargyl ethers.
• Demonstrated excellent functional group compatibility without harsh reagents.
• Achieved an atom and step economical protocol.

Conclusions:

• The developed Cu-catalyzed reaction provides a versatile and efficient route to indenes and benzofurans.
• The method's mild conditions and broad applicability make it valuable for organic synthesis.
• This novel approach offers potential for diverse chemical transformations and applications.