An approach to constructing γ-substituted δ-hydroxy ketones via Cu-catalyzed cyclopropanol-epoxide coupling

Area of Science:

• Organic Chemistry
• Catalysis
• Synthetic Methodology

Background:

• Cyclopropanols and epoxides are versatile building blocks in organic synthesis.
• Developing efficient catalytic methods for C-C bond formation is crucial for accessing complex molecular architectures.

Purpose of the Study:

• To develop a novel copper-catalyzed coupling reaction between cyclopropanols and monoarylated epoxides.
• To synthesize δ-hydroxy ketones with moderate to good yields.
• To explore the reaction mechanism and enable one-pot synthesis of cyclic acetals.

Main Methods:

• Copper-catalyzed coupling reaction.
• Utilizing cyclopropanols and monoarylated epoxides as substrates.
• Employing a synthesized Copper(I) complex for one-pot transformations.

Main Results:

• Successful synthesis of δ-hydroxy ketones.
• Achieved moderate to good yields for the target products.
• Proposed a reaction mechanism involving benzyl radical addition to a Cu(II)-homoenolate.
• Demonstrated one-pot formation of cyclic acetals using the Cu(I)-complex.

Conclusions:

• The developed Cu-catalyzed coupling provides an effective route to δ-hydroxy ketones.
• The reaction proceeds through a proposed radical pathway.
• The use of a Cu(I)-complex facilitates efficient one-pot synthesis of cyclic acetals, highlighting its synthetic utility.