Update on thiopyran-fused heterocycle synthesis (2013-2024)

Area of Science:

• Organic Chemistry
• Medicinal Chemistry
• Heterocyclic Chemistry

Background:

• Thiopyrans and their fused derivatives are vital scaffolds in natural products and exhibit significant biological importance.
• Developing efficient synthetic routes for these heterocycles is crucial for drug discovery and chemical synthesis.

Purpose of the Study:

• To provide a comprehensive overview of synthetic strategies for thiopyran-fused heterocycles.
• To cover literature published between 2013 and 2024.
• To highlight common precursors and asymmetric synthesis methods.

Main Methods:

• Review of synthetic methodologies for fusing thiopyran rings with various heterocycles (indole, quinoline, pyrimidine, etc.).
• Detailed discussion of reactions involving key precursors like indoline-2-thione, 2-mercaptoquinoline-3-carbaldehyde, and thiazolidinone.
• Inclusion of asymmetric synthesis approaches using chiral catalysts.

Main Results:

• Compilation of diverse synthetic strategies for thiopyran-fused heterocycles.
• Identification of prevalent precursors and their associated reactions.
• Overview of asymmetric synthesis techniques for thiopyranoindoles.
• Discussion of the biological activities of synthesized compounds.

Conclusions:

• The review consolidates recent advancements in the synthesis of thiopyran-fused heterocycles.
• Efficient synthetic routes and asymmetric methods are highlighted.
• The biological significance of these compounds underscores their therapeutic potential.