Alkynes and azides: beyond click chemistry.

Area of Science:

• Organic Chemistry
• Synthetic Chemistry
• Reaction Mechanisms

Background:

• Alkynes and azides possess weak π-bonds, enabling facile generation of high-energy reactive intermediates.
• Copper-catalyzed azide-alkyne cycloadditions (CuAAC) are a prominent example of click chemistry utilizing these functionalities.

Purpose of the Study:

• To review chemical transformations of alkynes and azides beyond the scope of copper-catalyzed azide-alkyne cycloadditions (CuAAC).
• To explore cascade reactions and interconversions of reactive intermediates derived from alkynes and azides.
• To highlight the synthetic utility and mechanistic insights offered by these reactions.

Main Methods:

• Review of literature focusing on reactions involving alkynes and azides.
• Analysis of reaction pathways leading to reactive intermediates.
• Examination of product structures, particularly heterocycles.

Main Results:

• Identification of diverse chemical reactions of alkynes and azides beyond CuAAC.
• Demonstration of mild reaction conditions for accessing reactive intermediates.
• Synthesis of valuable heterocyclic compounds with potential applications.

Conclusions:

• The chemistry of alkynes and azides offers a broad scope for synthetic transformations.
• These reactions provide mild and efficient routes to complex molecular architectures.
• Expanding the repertoire beyond CuAAC significantly enhances synthetic capabilities.