Sydnone: Synthesis, Reactivity and Biological Activities.
Souad Zerbib1, Mostafa Khouili1, Marco Catto2
1Molecular Chemistry, Materials and Catalysis Laboratory, Faculty of Sciences and Technologies, Sultan Moulay Slimane University, BP 523, 23000 Beni-Mellal, Morocco.
Current Medicinal Chemistry
|June 21, 2022
Summary
Sydnones are versatile mesoionic compounds. New CuSAC and SPSAC reactions enable efficient pyrazole synthesis from sydnones and alkynes, overcoming harsh conditions and improving regioselectivity for pharmaceutical and agrochemical applications.
Area of Science:
- Organic Chemistry
- Mesoionic Compounds
- Heterocyclic Chemistry
Background:
- Sydnones are a well-established class of mesoionic compounds with diverse chemical properties.
- Their 1,3-dipolar cycloaddition with alkynes yields pyrazole derivatives, crucial in pharmaceuticals and agrochemicals.
- Traditional sydnone-alkyne cycloadditions necessitate harsh conditions (high temperature, long reaction times) and suffer from poor regioselectivity.
Purpose of the Study:
- To develop milder and more efficient methods for sydnone-alkyne cycloaddition.
- To enhance the regioselectivity of pyrazole formation from sydnones.
- To introduce novel catalytic systems for sydnone-alkyne cycloaddition reactions.
Main Methods:
- Development and application of Copper-Catalyzed Sydnone-Alkyne Cycloaddition (CuSAC).
- Development and application of Strain-Promoted Sydnone-Alkyne Cycloaddition (SPSAC).
- Characterization of reaction kinetics and product regioselectivity.
Main Results:
- CuSAC and SPSAC reactions proceed under significantly milder conditions compared to thermal methods.
- These new methods provide improved regioselectivity in the formation of pyrazole derivatives.
- The developed reactions exhibit interesting and constant kinetic profiles.
Conclusions:
- CuSAC and SPSAC represent significant advancements in sydnone chemistry.
- These methods offer efficient and selective routes to valuable pyrazole compounds.
- The improved reaction conditions broaden the scope and utility of sydnones in synthesis.
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