Halocyclization of Alkynoic Thioester and Oxidative Aromatization in One-Pot

Area of Science:

• Organic Chemistry
• Heterocyclic Chemistry

Background:

• Thiophenes are crucial heterocyclic compounds with broad applications in pharmaceuticals, agrochemicals, and materials science.
• Efficient synthetic routes to thiophene derivatives are continuously sought after in organic synthesis.

Purpose of the Study:

• To develop a novel, one-pot synthetic methodology for the efficient preparation of thiophene derivatives.
• To investigate the halocyclization of alkynoic thioesters using N-halosuccinimide.
• To explore the potential applications of the synthesized dihydrothiophene products.

Main Methods:

• The study employed a one-pot reaction involving alkynoic thioesters as S-nucleophiles and N-halosuccinimide.
• Halocyclization was followed by oxidative aromatization using the same reagent.
• Mechanistic studies were conducted to elucidate the reaction pathway.

Main Results:

• A facile one-pot synthesis of thiophenes was achieved through the halocyclization and subsequent oxidative aromatization of alkynoic thioesters.
• The reaction demonstrated efficiency in producing dihydrothiophene derivatives.
• Preliminary assessment of the potential applications of the dihydrothiophene products was performed.

Conclusions:

• The developed method offers a straightforward and efficient route to synthetically valuable thiophene scaffolds.
• The study contributes to the synthetic toolbox for accessing important sulfur-containing heterocycles.
• The synthesized dihydrothiophenes hold promise for diverse applications across various scientific disciplines.