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Precise Synthesis of Ester-Functionalized Cyclo[6]- and Cyclo[7]furans.

Dhruv Sharma1, Leticia Maria Pequeno Madureira1, Tomasz Kowalewski1

  • 1Department of Chemistry, Carnegie Mellon University, 4400 Fifth Ave., Pittsburgh, Pennsylvania 15213, United States.

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Summary
This summary is machine-generated.

Researchers developed a straightforward synthesis for cyclo[n]furan macrocycles using Suzuki-Miyaura cross-coupling. This robust method yields cyclo[6]- and cyclo[7]furan esters, offering new possibilities for optoelectronic materials.

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Area of Science:

  • Organic Chemistry
  • Materials Science

Background:

  • Shape-persistent conjugated macrocycles possess unique optoelectronic and self-assembly properties.
  • Traditional syntheses for these macrocycles can be complex and time-consuming.

Purpose of the Study:

  • To develop a straightforward and robust synthetic protocol for cyclo[n]furan macrocycles.
  • To investigate the Suzuki-Miyaura cross-coupling reaction for the synthesis of these novel macrocycles.

Main Methods:

  • Utilized Suzuki-Miyaura cross-coupling of hexyl 2-bromo-5-(boronic acid pinacol ester)furan-3-carboxylate.
  • Employed tris(dibenzylideneacetone)dipalladium(0), tri-tert-butylphosphonium tetrafluoroborate, and cesium fluoride as reaction components.
  • Separated cyclo[6]- and cyclo[7]furan esters via column chromatography.

Main Results:

  • Achieved a 45% yield for the synthesis of cyclo[6]- and cyclo[7]furan esters (28% and 17% respectively).
  • Demonstrated a robust macrocyclization protocol with 52 ± 6% total conversion to macrocycles over three runs.
  • Observed rapid oligomerizations, suggesting a potential chain-growth mechanism.

Conclusions:

  • The developed Suzuki-Miyaura cross-coupling protocol provides an efficient route to cyclo[n]furan esters.
  • The size and conformational flexibility of cyclo[6]- and cyclo[7]furans influence their optical and electronic properties.
  • This work facilitates further exploration of cyclofurans in materials science and optoelectronics.