Iodolopyrazolium Salts: Synthesis, Derivatizations, and Applications

Area of Science:

• Organic Chemistry
• Medicinal Chemistry

Background:

• Pyrazoles are important heterocyclic compounds with diverse biological activities.
• Iodinated organic compounds are valuable in synthesis and medicinal chemistry.
• Cyclic iodonium salts offer unique reactivity patterns.

Purpose of the Study:

• To develop a novel synthetic route to iodolopyrazolium triflates.
• To explore the synthetic utility of these novel cyclic iodonium salts.
• To apply these intermediates in the synthesis of celecoxib derivatives and investigate their properties as halogen-bond donors.

Main Methods:

• Oxidative cyclization of 3-(2-iodophenyl)-1H-pyrazoles.
• Demonstration of substrate scope for the cyclization reaction.
• Application in site-selective ring-opening reactions.
• Synthesis of celecoxib derivatives.
• Evaluation of halogen-bond donating properties.

Main Results:

• Successful synthesis of a range of iodolopyrazolium triflates.
• Broad substrate scope observed for the oxidative cyclization.
• Demonstrated utility as synthetic intermediates in site-selective ring openings.
• Generated novel derivatives of the anti-inflammatory drug celecoxib.
• Showcased potent halogen-bond donating abilities of the synthesized salts.

Conclusions:

• The oxidative cyclization provides an efficient method for synthesizing iodolopyrazolium triflates.
• These novel cyclic iodonium salts are valuable synthetic intermediates.
• The developed methodology allows for the preparation of celecoxib derivatives with potential therapeutic applications.
• The synthesized compounds are effective halogen-bond donors.