New 1,3-disubstituted 2,2-dimethylcyclopropanes of the isoxazole and pyrazole series were synthesized starting from (+)-3-carene. Olefination of the reductive ozonolysis product of (+)-4-acetyl-2-carene produced 1R-cis-3-(2,2-dibromovinyl)-2,2-dimethylcyclopropane, further reaction of which with hydroxylamine or hydrazines led to heterocyclic compounds. It was shown that 3,5-dimethylpyrazoles could be synthesized on the surface of Al2O3 using ultrasonic irradiation. Studies of the antimicrobial activity of heterocyclic derivatives of dibromovinyl-2,2-dimethylcyclopropane found significant fungicidal effects of pyrazoles 8, 10, and 11 with weak antibacterial activity.
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The work was financially supported by Applied Research Projects Nos. 20.80009.5007.17 and 20.80009-8007.14 of the National Agency for Research and Development of the Republic of Moldova.
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Translated from Khimiya Prirodnykh Soedinenii, No. 1, January–February, 2024, pp. 114–117.
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Cojocari, S.V., Curlat, S.N. & Macaev, F.Z. Synthesis of 1R-cis-Dibromovinyl-2,2-dimethylcyclopropanes of the Isoxazole and Pyrazole Series Based on (+)-3-Carene. Chem Nat Compd 60, 133–137 (2024). https://doi.org/10.1007/s10600-024-04267-w
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DOI: https://doi.org/10.1007/s10600-024-04267-w