Hydrazine Derivatives as C-Centered Radical Precursors for C-C Bond Formation Reactions

Area of Science:

• Organic Chemistry
• Synthetic Chemistry
• Radical Chemistry

Background:

• Organic monosubstituted hydrazine derivatives are versatile reagents.
• They serve as stable and atom-efficient precursors for C-centered radicals.
• Radical generation occurs via oxidation with nitrogen gas extrusion.

Purpose of the Study:

• To review the synthetic applications of monosubstituted hydrazine derivatives.
• Focus on their role in free-radical C-C bond-forming reactions.
• Highlight key reaction types and their significance.

Main Methods:

• Utilizing arylhydrazines, carbazates, acylhydrazides, hydrazine carboxamides, and alkylhydrazines.
• Employing oxidation for radical generation.
• Applying these radicals in C-C bond formation.

Main Results:

• Demonstrated utility in alkene difunctionalization reactions.
• Showcased cascade cyclizations initiated by radical addition to acrylamides and isonitriles.
• Detailed CH-functionalization of (hetero)arenes via radical addition and oxidative dehydrogenation.

Conclusions:

• Monosubstituted hydrazine derivatives are valuable synthons for radical chemistry.
• Their application enables efficient C-C bond formation through diverse pathways.
• These methods offer strategic advantages in organic synthesis.