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Related Experiment Videos

Mild method for the conversion of amides to thioamides.

André B Charette1, Michel Grenon

  • 1Département de Chimie, Université de Montréal, P.O. Box 6128, Station Downtown, Montréal, Québec, Canada H3C 3J7. andre.charette@umontreal.ca

The Journal of Organic Chemistry
|July 4, 2003
PubMed
Summary

Aqueous ammonium sulfide offers a safe and effective alternative to hydrogen sulfide for synthesizing thioamides and potentially thionoesters. This method is simple, inexpensive, and suitable for large-scale chemical preparations.

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry

Background:

  • Hydrogen sulfide is a toxic gas commonly used in thiolysis reactions.
  • There is a need for safer and more accessible reagents for thioamide synthesis.

Purpose of the Study:

  • To evaluate aqueous ammonium sulfide as a replacement for hydrogen sulfide in thiolysis.
  • To develop simple, inexpensive, and scalable methods for thioamide and thionoester synthesis.

Main Methods:

  • Thioamide synthesis via thiolysis of activated amides using aqueous ammonium sulfide.
  • Exploration of two distinct, operationally simple procedures.
  • Assessment of substrate scope and scalability.

Main Results:

  • High yields of thioamides were achieved across a broad range of substrates.

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  • Aqueous ammonium sulfide proved to be an ideal substitute for hydrogen sulfide.
  • Preliminary studies suggest applicability in thionoester synthesis.

    • Conclusions:

    • Aqueous ammonium sulfide is a viable, safer alternative to hydrogen sulfide for thioamide preparation.
    • The developed methods are cost-effective, scalable, and operationally simple.
    • Further research into thionoester synthesis using this reagent is warranted.