Functionalized Cyclopentanes via Sc(III)-Catalyzed Intramolecular Enolate Alkylation.

Area of Science:

• Organic Chemistry
• Synthetic Chemistry

Background:

• Cyclopentane structures are prevalent in natural products and pharmaceuticals.
• Efficient synthesis of highly functionalized cyclopentanes remains a challenge.

Purpose of the Study:

• To develop a straightforward method for synthesizing functionalized cyclopentanes.
• To explore the utility of intramolecular α-tert-alkylation of unsaturated β-ketoesters.

Main Methods:

• Utilized intramolecular α-tert-alkylation of unsaturated β-ketoesters.
• Employed scandium(III) triflate as a Lewis acid catalyst.
• Operated under mild reaction conditions.

Main Results:

• Achieved the synthesis of highly functionalized cyclopentanes.
• Demonstrated operational simplicity and mild reaction conditions.
• Produced cyclopentanes with accessible sites for further functionalization, including heterocycles and spirocyclic architectures.

Conclusions:

• The developed strategy offers a versatile route to complex cyclopentane derivatives.
• The method is efficient and amenable to creating diverse molecular architectures.
• Scandium(III) triflate catalysis enables facile access to valuable synthetic intermediates.