European Journal of Chemistry 2020, 11(1), 68-79 | doi: | Get rights and content

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Ultrasound assisted synthesis of pyrazolo[1,5-a]pyrimidine-antipyrine hybrids and their anti-inflammatory and anti-cancer activities

Shunan Kaping (1) orcid , Melboureen Sunn (2) orcid , Laishram Indira Singha (3) orcid , Jai Narain Vishwakarma (4,*) orcid

(1) Organic Research Laboratory, Department of Chemical Science, Assam Don Bosco University, Tapesia Gardens, Sonapur 782402, Assam, India
(2) Department of Biotechnology, St. Anthony’s College, Shillong 793001, Meghalaya, India
(3) Department of Biotechnology, St. Anthony’s College, Shillong 793001, Meghalaya, India
(4) Organic Research Laboratory, Department of Chemical Science, Assam Don Bosco University, Tapesia Gardens, Sonapur 782402, Assam, India
(*) Corresponding Author

Received: 20 Nov 2019 | Revised: 11 Feb 2020 | Accepted: 14 Feb 2020 | Published: 31 Mar 2020 | Issue Date: March 2020


A series of antipyrinyl-pyrazolo[1,5-a]pyrimidines have been synthesized by reactions of aminopyrazole (4) with various formylated active proton compounds in the presence of KHSO4 (aqueous media), under ultrasound irradiation. The structures of the compounds have been established with the help of spectral and analytical data. N-(1,5-Dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)-7-phenylpyrazolo[1,5-a]pyrimidine-3-carboxamide (6a) was further subjected to X-ray crystallographic studies to avoid any ambiguity of the derived structures. Crystal data for compound 6a, C51H46N12O5 (=907.00 g/mol): triclinic, space group P-1 (no. 2), a = 9.9554(3) Å, b = 14.0875(4) Å, c = 17.4572(4) Å, α = 79.676(2)°, β = 85.283(2)°, γ = 72.647(2)°, = 2297.97(11) Å3, Z = 2, T = 296.15 K, μ(MoKα) = 0.088 mm-1, Dcalc = 1.311 g/cm3, 29732 reflections measured (4.174° ≤ 2Θ ≤ 57.068°), 10681 unique (Rint = 0.0400, Rsigma = 0.0533) which were used in all calculations. The final R1 was 0.0566 (I > 2σ(I)) and wR2 was 0.1663 (all data). The novel compounds were also screened for their biological activities.


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European Journal of Chemistry


Aminopyrazole; 4-Aminoantipyrine; Pyrazolopyrimidines; X-ray crystallography; Ultrasound irradiation; Potassium hydrogen sulphate

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DOI: 10.5155/eurjchem.11.1.68-79.1942

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Department of Biotechnology, Ministry of Science and Technology, Government of India, New Delhi-110 003, India.



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How to cite

Kaping, S.; Sunn, M.; Singha, L.; Vishwakarma, J. Eur. J. Chem. 2020, 11(1), 68-79. doi:10.5155/eurjchem.11.1.68-79.1942
Kaping, S.; Sunn, M.; Singha, L.; Vishwakarma, J. Ultrasound assisted synthesis of pyrazolo[1,5-a]pyrimidine-antipyrine hybrids and their anti-inflammatory and anti-cancer activities. Eur. J. Chem. 2020, 11(1), 68-79. doi:10.5155/eurjchem.11.1.68-79.1942
Kaping, S., Sunn, M., Singha, L., & Vishwakarma, J. (2020). Ultrasound assisted synthesis of pyrazolo[1,5-a]pyrimidine-antipyrine hybrids and their anti-inflammatory and anti-cancer activities. European Journal of Chemistry, 11(1), 68-79. doi:10.5155/eurjchem.11.1.68-79.1942
Kaping, Shunan, Melboureen Sunn, Laishram Indira Singha, & Jai Narain Vishwakarma. "Ultrasound assisted synthesis of pyrazolo[1,5-a]pyrimidine-antipyrine hybrids and their anti-inflammatory and anti-cancer activities." European Journal of Chemistry [Online], 11.1 (2020): 68-79. Web. 29 May. 2023
Kaping, Shunan, Sunn, Melboureen, Singha, Laishram, AND Vishwakarma, Jai. "Ultrasound assisted synthesis of pyrazolo[1,5-a]pyrimidine-antipyrine hybrids and their anti-inflammatory and anti-cancer activities" European Journal of Chemistry [Online], Volume 11 Number 1 (31 March 2020)

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