Access to Spiroindanolactones/lactams through an Aryne Insertion/Spirocyclization Strategy

Area of Science:

• Organic Chemistry
• Synthetic Chemistry
• Medicinal Chemistry

Background:

• Spiro-fused heterocyclic compounds are prevalent in natural products and pharmaceuticals.
• Efficient synthetic routes to spiroindanone derivatives are highly sought after.
• Metal-catalyzed reactions often dominate the synthesis of complex organic molecules.

Purpose of the Study:

• To develop a novel, metal-free synthetic strategy for spiro-fused indanolactones and lactams.
• To explore the utility of arynes in constructing spirocyclic frameworks.
• To provide a facile route to diverse spiroindanone derivatives.

Main Methods:

• Reaction of in-situ generated arynes with α-chloroacetyl lactones/lactams.
• Utilizing a metal-free reaction environment.
• Employing a tandem aryne insertion/spirocyclization mechanism.

Main Results:

• An efficient synthesis of spiro-fused indanolactones and lactams was achieved.
• The reaction proceeds under mild, metal-free conditions.
• Diverse spiroindanone derivatives were successfully synthesized, demonstrating the broad applicability of the method.

Conclusions:

• A practical and efficient metal-free synthetic strategy for spiro-fused indanolactones/lactams has been established.
• The developed method offers a valuable tool for accessing complex spiroindanone scaffolds.
• This approach avoids the use of potentially toxic or expensive metal catalysts.