Engaging Isatins in Multicomponent Reactions (MCRs) - Easy Access to Structural Diversity

Area of Science:

• Organic Chemistry
• Medicinal Chemistry
• Synthetic Chemistry

Background:

• Multicomponent reactions (MCRs) are essential for diversity-oriented synthesis.
• Isatin is a versatile starting material for generating complex molecular scaffolds.
• The application of MCRs to privileged structures is increasingly important in drug discovery.

Purpose of the Study:

• To review recent novel methodologies for multicomponent reactions involving isatin.
• To categorize these MCRs based on the resulting product structures.
• To showcase the synthetic utility of isatin in generating diverse heterocyclic compounds.

Main Methods:

• Literature review of recent advancements in isatin-based MCRs.
• Classification of MCRs by the structural features of the obtained products.
• Analysis of reaction pathways leading to oxindole derivatives and other heterocycles.

Main Results:

• Isatin readily participates in various MCRs to yield diverse oxindole derivatives, including spirooxindoles, bis-oxindoles, and 3,3-disubstituted oxindoles.
• Specific reaction conditions can also induce ring-opening of isatin, leading to alternative heterocyclic systems.
• New synthetic strategies have expanded the scope of isatin-based MCRs.

Conclusions:

• Isatin is a highly valuable and accessible building block for MCRs in organic and medicinal chemistry.
• Recent developments have significantly broadened the synthetic possibilities using isatin in MCRs.
• The MCRs of isatin provide efficient access to privileged structures with potential pharmaceutical applications.