Organohypervalent iodine: development, applications, and future directions.

Area of Science:

• Organic Chemistry
• Synthetic Chemistry
• Organometallic Chemistry

Background:

• Organohypervalent iodine reagents are versatile tools in organic synthesis.
• Their application spans various transformations, including functionalization and cyclization reactions.

Purpose of the Study:

• To illustrate the broad synthetic utility of organohypervalent iodine reagents.
• To present a unifying mechanistic pathway for these diverse reactions.

Main Methods:

• Utilizing organohypervalent iodine reagents for alpha-functionalization of ketones (hydroxylation, tosyloxylation, alkoxylation, arylation).
• Employing these reagents in carbon-carbon bond formation and intramolecular cyclopropanation.
• Applying them to classic reactions like the Hunsdiecker reaction and Hofmann rearrangement.
• Investigating transformations within the cubane series and synthesizing heterocycles.

Main Results:

• Demonstrated successful alpha-hydroxydimethylacetal formation from enolizable ketones.
• Achieved various alpha-functionalizations and carbon-carbon bond formations.
• Synthesized diverse heterocycle structures and performed specific transformations in the cubane series.
• Proposed a unifying mechanism involving iodonium center attack, ligand coupling, and reductive elimination.

Conclusions:

• Organohypervalent iodine reagents offer a powerful and unified approach to a wide array of synthetic challenges.
• The proposed mechanism provides a consistent explanation for the reactivity of these reagents across diverse transformations.