A novel protocol for catalyst-free synthesis of fused six-member rings to triazole and pyrazole


Herein, an effectual, quick and novel method is described for the synthesis of new triazolo[1,5-a]pyrimidine, triazolo[5,1-b][1,3] thiazine and pyrazolo[1,5-a]pyrimidine derivatives. This series of fused six-member rings to triazole and pyrazole was prepared via the catalyst-free reaction of dialkyl acetylenedicarboxylates and 3-substituted 1H-1,2,4-triazole or 3-amino-1H-pyrazole-4-carbonitrile. The structures of the prepared products were deduced from their Fourier-transform infrared, elemental analysis and proton and carbon-13 nuclear magnetic resonance spectral data.

Graphical abstract

A novel and green method is described for the synthesis of new triazolo[1,5-a]pyrimidine, triazolo[5,1-b][1,3] thiazine and pyrazolo[1,5-a]pyrimidine derivatives.

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The authors gratefully acknowledge partial support of this work by Yasouj University, Iran.

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Correspondence to Bahador Karami.

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Akrami, S., Karami, B. & Farahi, M. A novel protocol for catalyst-free synthesis of fused six-member rings to triazole and pyrazole. Mol Divers 24, 225–231 (2020). https://doi.org/10.1007/s11030-019-09944-5

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  • Pyrazolo[15-a]pyrimidine
  • Triazolo[1,5-a]pyrimidine
  • Triazolo[5,1-b][1,3] thiazine
  • Dialkyl acetylenedicarboxylates
  • 3-Amino-1H-1,2,4-triazole
  • 3-Amino-1H-pyrazole-4-carbonitrile