CuCl-Promoted β-Acylation of Cyclopropanols with Thioesters

Area of Science:

• Organic Synthesis
• Organometallic Chemistry
• Catalysis

Background:

• 1,4-Dicarbonyl compounds are valuable synthetic intermediates.
• Efficient methods for their synthesis are continuously sought.
• Copper catalysis offers unique reactivity pathways in organic synthesis.

Purpose of the Study:

• To develop a novel synthetic route to 1,4-dicarbonyl compounds.
• To utilize copper(I) chloride (CuCl) for cyclopropanol ring-opening and acylation.
• To investigate the reaction mechanism and scope.

Main Methods:

• Copper(I) chloride (CuCl) catalyzed reaction of cyclopropanols with thioesters.
• Synthesis of various substituted cyclopropanols and thioesters.
• Mechanistic studies involving experimental and computational methods.

Main Results:

• Successful synthesis of a series of 1,4-dicarbonyl compounds.
• Demonstrated broad substrate scope with various cyclopropanols and thioesters.
• Identified a Cu(I)-homoenolate intermediate involved in the reaction mechanism via oxidative addition to thioesters.

Conclusions:

• A novel and efficient CuCl-catalyzed method for synthesizing 1,4-dicarbonyl compounds from cyclopropanols and thioesters has been established.
• The reaction proceeds via a Cu(I)-homoenolate intermediate.
• The method is operationally simple, highly chemo- and regioselective, and provides good to excellent yields.