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Facile Regioselective On-Water Synthesis of 4,7-Dihydropyrazolo[1,5-a]Pyrimidines and 4,7-Dihydro[1,2,4]Triazolo[1,5-a]Pyrimidines

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Chemistry of Heterocyclic Compounds Aims and scope

Efficient and regioselective on-water synthesis of variously substituted 5-amino-4,7-dihydropyrazolo[1,5-a]pyrimidine-6-carbonitriles and 5-amino-4,7-dihydro[1,2,4]triazolo[1,5-a]pyrimidine-6-carbonitriles using 1,8-diazabicyclo[5.4.0]undec-7-ene as catalyst has been demonstrated. The reaction of 2-benzylidenemalononitriles and 3-aryl-1H-pyrazol-5-amines or 1H-1,2,4-triazol-5-amine allows to obtain the respective pyrazolo[1,5-a]pyrimidines and [1,2,4]triazolo[1,5-a]pyrimidines in high yields up to 93%. Main advantages of the developed synthetic protocol are application of water as environmentally friendly solvent, short reaction times, simple workup procedure that often does not require further purification of products, and broad substrate scope.

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ACKNOWLEDGEMENT

The authors gratefully acknowledge Mr. Amamudin Ansari for spectroscopic analysis of all synthesized compounds. The authors are thankful to Dr. Jandeep Singh (Assistant Professor, Lovely Professional University, Punjab) for providing help with linguistic corrections.

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Correspondence to Taslimahemad T. Khatri.

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Supplementary information file, containing IR (compounds 3c, 6b,e, and 7c), 1H and 13C NMR (compounds 3c, 7c,f) spectroscopic and mass spectral data (compounds 3c, 7d), and results of optimization of reaction conditions, is available at the journal website at http://link.springer.com/journal/10593.

Published in Khimiya Geterotsiklicheskikh Soedinenii, 2019, 55(3), 246–253

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Gol, R.M., Khatri, T.T. & Barot, V.M. Facile Regioselective On-Water Synthesis of 4,7-Dihydropyrazolo[1,5-a]Pyrimidines and 4,7-Dihydro[1,2,4]Triazolo[1,5-a]Pyrimidines. Chem Heterocycl Comp 55, 246–253 (2019). https://doi.org/10.1007/s10593-019-02449-x

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