

Efficient synthesis of diversely substituted pyrazolo[1,5-a]pyrimidine derivatives promoted by ultrasound irradiation in water and their antibacterial activities
Susma Das (1)







(1) Organic Research Laboratory, Department of Chemical Science, Assam Don Bosco University, Tapesia Gardens, Sonapur 782402, Assam, India
(2) Organic Research Laboratory, Department of Chemical Science, Assam Don Bosco University, Tapesia Gardens, Sonapur 782402, Assam, India
(3) Organic Research Laboratory, Department of Chemical Science, Assam Don Bosco University, Tapesia Gardens, Sonapur 782402, Assam, India
(4) Indian Council of Agricultural Research Complex for North Eastern Hill Region, Umiam 793103, Meghalaya, India
(5) Indian Council of Agricultural Research Complex for North Eastern Hill Region, Umiam 793103, Meghalaya, India
(6) Laboratoire de Chimie Thérapeutique, UMR CNRS 8638, Faculte des Sciences Pharmaceutiques, Université Paris Descartes, Sorbonne Paris Cité 4 avenue de l'Observatoire, 75270 Paris Cedex 06, France
(7) Organic Research Laboratory, Department of Chemical Science, Assam Don Bosco University, Tapesia Gardens, Sonapur 782402, Assam, India
(*) Corresponding Author
Received: 25 Aug 2020 | Revised: 30 Sep 2020 | Accepted: 02 Oct 2020 | Published: 31 Dec 2020 | Issue Date: December 2020
Abstract
A green synthetic route leading to the discovery of a series of diversely substituted pyrazolo[1,5-a]pyrimidines, having CO2Et group embedded at position-2 has been unraveled in this article. A series of formylated active proton compounds that were chosen to react with a carboxylate substituted-3-aminopyrazole under ultrasonic irradiation in the presence of a mild acid as a catalyst and aqueous ethanol medium afforded the desired products. The molecular structures of all these synthesized compounds were established by their spectral and analytical data. A model molecule 3d, subjected to single-crystal X-ray crystallography analysis further confirms their molecular structure. The crystal crystallized to a monoclinic cell with P21/c space group, a = 7.468 (5) Å, b = 27.908 (17) Å, c = 7.232 (4) Å, β = 104.291 (7)o, V =1460.7(15) Å3, Z = 4, μ(MoKα) = 0.096 mm-1, Dcalc = 1.352 Mg/m3 16667 measured reflection (5.63 ≤ 2Θ ≤ 57.57°), 3720 unique (Rint = 0.0965, Rsigma = 0.0945) which were used in all calculations. The final R1 was 0.0750 (I > 2σ(I)) and wR2 was 0.2226 (all data). These compounds were further explored for their antibacterial potential, and a few of them have exhibited encouraging results.
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DOI: 10.5155/eurjchem.11.4.304-313.2033
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Department of Biotechnology, Ministry of Science and Technology, Government of India, New Delhi-110 003, India and Indian Council of Agricultural Research (ICAR)-Barapani, Shillong, India.
Citations
[1]. Mohamed El Hafi, Sanae Lahmidi, Mohammed Boulhaoua, Lhoussaine El Ghayati, Hanan Albalwi, El Hassane Anouar, Abdulrahman I. Alharthi, Joel T. Mague, El Mokhtar Essassi, Chin‐Hung Lai
A new synthetic route for the preparation of 2,2′,5′‐trimethyl‐7‐oxo‐4,7‐dihydro‐[6,7′‐bipyrazolo[1,5‐a]pyrimidine]‐3,3′‐dicarbonitrile, structural elucidation, Hirshfeld surface analysis, energy framework, density functional theory and molecular docking investigations
Journal of the Chinese Chemical Society 69(4), 717, 2022
DOI: 10.1002/jccs.202100509

[2]. Susma Das, Labet Bankynmaw Marpna, Jai Narain Vishwakarma
Efficient, environment friendly and regioselective synthetic strategy for 2/3-substituted-8,8-dimethyl-8,9-dihydropyrazolo[1,5-a]quinazolin-6(7H)-ones and their structure elucidation
European Journal of Chemistry 13(1), 41, 2022
DOI: 10.5155/eurjchem.13.1.41-48.2168

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