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A Microwave-Assisted Direct Heteroarylation of Ketones Using Transition Metal Catalysis
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Microwave accelerated Glaser-Hay macrocyclizations at high concentrations.

Anne-Catherine Bédard1, Shawn K Collins

  • 1Département de Chimie, Centre for Green Chemistry and Catalysis, Université de Montréal, CP 6128 Station Downtown, Montréal, Québec, CanadaH3C 3J7. shawn.collins@umontreal.ca.

Chemical Communications (Cambridge, England)
|May 23, 2012
PubMed
Summary

Microwave irradiation and phase separation enable efficient macrocyclization at high concentrations. This method significantly reduces reaction times for Glaser-Hay macrocyclization, making complex molecule synthesis faster and more scalable.

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry
  • Process Chemistry

Background:

  • Traditional macrocyclization methods often require high dilution conditions.
  • Achieving efficient macrocyclization at higher concentrations is challenging due to competing side reactions.
  • The Glaser-Hay coupling is a key reaction for forming macrocycles but can be slow.

Purpose of the Study:

  • To develop a more efficient method for macrocyclization.
  • To accelerate the Glaser-Hay macrocyclization reaction.
  • To enable macrocyclization at significantly higher concentrations.

Main Methods:

  • Employing microwave irradiation to enhance reaction rates.
  • Utilizing a phase separation strategy to manage high concentrations.
  • Investigating the Glaser-Hay macrocyclization under optimized conditions.

Main Results:

  • Macrocyclization was achieved efficiently at concentrations up to 0.1 M.
  • Reaction times were reduced from 48 hours to 1-6 hours.
  • Microwave irradiation significantly accelerated the Glaser-Hay macrocyclization rate.

Conclusions:

  • Microwave-assisted macrocyclization with phase separation is a highly efficient strategy.
  • This method allows for significantly increased substrate concentrations.
  • The accelerated reaction rates and higher concentrations offer a scalable approach to macrocycle synthesis.