Palladium-catalyzed cascade annulation to construct functionalized β- and γ-lactones in ionic liquids

Area of Science:

• Organic Chemistry
• Green Chemistry
• Catalysis

Background:

• Lactones are crucial structural motifs in biologically active natural products.
• Efficient synthesis of functionalized lactones remains a key challenge in organic chemistry.

Purpose of the Study:

• To develop a novel, efficient, and mild synthetic methodology for functionalized β- and γ-lactones.
• To establish a green and practical approach utilizing ionic liquids and palladium catalysis.

Main Methods:

• A one-pot, four-step cascade annulation reaction.
• Palladium-catalyzed transformation in ionic liquids.
• Mild reaction conditions were employed.

Main Results:

• The reaction afforded functionalized β- and γ-lactones in moderate to good yields.
• High regio- and diastereoselectivities were achieved.
• The use of ionic liquids contributed to a green and practical transformation.

Conclusions:

• A novel and convenient methodology for constructing biologically active lactones was established.
• The developed cascade annulation is efficient, mild, and environmentally friendly.
• This method provides access to valuable lactone structures.