Novel palladium-catalyzed cascade carboxylative annulation to construct functionalized γ-lactones in ionic liquids

Area of Science:

• Organic Chemistry
• Catalysis

Background:

• γ-lactones are important heterocyclic compounds with diverse applications.
• Developing efficient synthetic routes for functionalized γ-lactones remains a key challenge in organic synthesis.

Purpose of the Study:

• To develop a novel, efficient, and general method for synthesizing functionalized γ-lactones.
• To showcase a rare instance of carbonylation involving a C(sp(3))-palladium bond.

Main Methods:

• A one-pot, four-step cascade reaction was employed.
• The methodology utilizes a novel palladium-catalyzed process.
• Carbonylation of the C(sp(3))-palladium bond was achieved.

Main Results:

• Functionalized γ-lactones were synthesized in moderate to good yields.
• The developed method is novel and general.
• The reaction demonstrates a rare carbonylation of a C(sp(3))-palladium bond.

Conclusions:

• A new and efficient palladium-catalyzed cascade method for γ-lactone synthesis has been established.
• This methodology offers a valuable tool for accessing functionalized γ-lactones.
• The study highlights a significant advancement in C(sp(3))-palladium bond chemistry.