A Green and Sustainable Access to 2,3-Dihydroquinazolin-4(1H)-ones Using Nanosized Heterogeneous Metal/Metal Sulfide@Carbon Catalyst A. D. Tangade, A. V. Dhirbassi, S. S. Kauthale, L. Kótai, R. P. Pawar, S. U. Tekale Russian Journal of Organic Chemistry, 2025 Abstract A green sustainable one-pot multicomponent condensation of aldehydes, isatoic anhydride, and ammonium acetate in refluxing ethanol has been developed for the synthesis of 2,3-dihydroquinazolin-4(1H)-ones using copper, zinc sulfide, or nickel sulfide-loaded carbon-based heterogeneous catalysts prepared from metal salt-loaded sulfonate-functionalized styrene–divinylbenzene copolymers. The developed protocol is efficient, convenient, and superior to the existing methods for the synthesis of dihydroquinazolin-4(1H)-ones. High yields, environmentally benign conditions, simple work-up, and catalyst reusability without a significant loss in catalytic efficiency are the main advantages of this protocol.
Carbon Microspheres Co-decorated with Nanosized Iron Sulfide and Magnetite Nanoparticles as a Magnetically Separable Heterogeneous Catalyst for the Green Synthesis of 4,4′-(Arylmethylene)bis(1H-pyrazol-5-ols) A. V. Dhirbassi, S. S. Kauthale, L. Kótai, T. Pasinszki, R. P. Pawar, S. U. Tekale Russian Journal of Organic Chemistry, 2025 Abstract Carbon microspheres co-decorated with nanosized iron sulfide and magnetite nanoparticles were synthesized by carbonizing an iron(III) sulfate-loaded polystyrene–divinylbenzene-based iminodiacetate-type cation-exchange resin in an inert atmosphere at 600°C for 4 h. The synthesized material was successfully employed as a magnetically separable heterogeneous catalyst for the green synthesis of 4,4′-(arylmethylene)bis(1H-pyrazol-5-ols) via a one-pot pseudo-three-component condensation of aldehydes and 3-methyl-5-pyrazolone. The developed protocol offers several advantages, including high yields, short reaction times, simple work-up procedure, and catalyst reusability. Hence, it represents a valuable contribution to green and sustainable chemistry.
Environmentally Benign and Expeditious Access to 4-Aryl Methylene-isoxazole-5(4H)-Ones Using Magnetically Separable Nanoparticles Anand V. Dhirbassi, Akshay D. Tangade, Sushama S. Kauthale, László Kótai, Tibor Pasinszki, Rajendra P. Pawar, Sunil U. Tekale Chemistryselect, 2024 An environmentally benign and expeditious protocol was developed for the one‐pot multicomponent synthesis of 4‐aryl‐3‐methylisoxazol‐5(4H)‐ones by the condensation of aldehyde, hydroxyl amine hydrochloride, and ethyl acetoacetate in 50% aq. ethanol at 50 °C. The reaction was catalyzed by magnetically separable carbon microspheres co‐decorated with nanosized iron sulfide and magnetite nanoparticles in 10 wt% amount. The FeS1‐x‐Fe3O4/C nanocatalyst was prepared from iron(III) sulfate loaded iminodiacetate group functionalized styrene‐divinylbenzene based ion exchanger by pyrolysis reaction performed at 600 °C for 4 h. The use of magnetically separable heterogeneous catalyst, aqueous ethanol, short reaction time (30 min), and nonchromatographic purification methods are the striking features of the developed protocol. The isolated yield of the condensation products varied between 81% and 96%. Furthermore, the protocol exhibits high functional group tolerance and includes the use of noncorrosive, nonhazardous reaction conditions affording the product in excellent yields and short reaction time.
Recent advances in nanocatalyzed synthesis of triazoles and tetrazoles and their biological studies Popat M. Jadhav, A. B. Kanagare, Anand B. Dhirbassi, Atam B. Tekale, R. M. Borade, S. U. Tekale, Keshav Lalit Ameta, R. P. Pawar Nanocatalysis Synthesis of Bioactive Heterocycles, 2022 Triazoles and tetrazoles are biologically significant five-membered heterocyclic that constitute the skeletons of several commercially marketed drugs and other heterocyclic compounds, which have a diverse range of biological activities including antimicrobial, antioxidant, anticancer, antidiabetic, and other potentials. During the last two decades, nanotechnology has remained synthetically important from a synthetic chemistry viewpoint This chapter accounts for the recent advances in biological activity and the synthesis of triazoles and tetrazoles using nanocatalysts (NCs).
RECENT SCHOLAR PUBLICATIONS
Environment-Friendly and Efficient Synthesis of 2-Aryl Quinoxalines by Using Carbon Microspheres Decorated with Copper Nanoparticles as a Heterogeneous Nanocatalyst AV Dhirbassi, AD Dhole, VG Kale, SS Kauthale, L Kótai, RP Pawar, ... Russian Journal of General Chemistry 96 (6), 129 , 2026 2026
Eco-Friendly Access to 2,4,5-Trisubstituted Imidazoles using (Cu 2 O)Cu@C-NPs as a Nanoparticulate Heterogeneous Catalyst AD Tangade, AV Dhirbassi, L Kótai, SU Tekale Organic Preparations and Procedures International, 1-7 , 2026 2026
A Green and Sustainable Access to 2,3-Dihydroquinazolin-4(1 H )-ones Using Nanosized Heterogeneous Metal/Metal Sulfide@Carbon Catalyst AD Tangade, AV Dhirbassi, SS Kauthale, L Kótai, RP Pawar, SU Tekale Russian Journal of Organic Chemistry 61 (12), 2300-2306 , 2025 2025
Synthesis of 2-Amino-4-aryl Thiazoles using Cu-NP/C Heterogeneous Catalyst AV Dhirbassi, SS Kauthale, AD Tangade, L Kótai, RP Pawar, SU Tekale Organic Preparations and Procedures International 57 (6), 542-548 , 2025 2025 Citations: 1
Principles of Undergraduate Chemistry SSK SU Tekale, AV Dhirbassi 2025
Carbon Microspheres Co-decorated with Nanosized Iron Sulfide and Magnetite Nanoparticles as a Magnetically Separable Heterogeneous Catalyst for the Green Synthesis of 4, 4 … AV Dhirbassi, SS Kauthale, L Kótai, T Pasinszki, RP Pawar, SU Tekale Russian Journal of Organic Chemistry 61 (3), 541-547 , 2025 2025 Citations: 1
Foundations of Chemistry SUT SSK, Anand Dhirbassi 2025
Environmentally Benign and Expeditious Access to 4‐Aryl Methylene‐isoxazole‐5 (4H)‐Ones Using Magnetically Separable Nanoparticles AV Dhirbassi, AD Tangade, SS Kauthale, L Kótai, T Pasinszki, RP Pawar, ... ChemistrySelect 9 (38), e202403387 , 2024 2024 Citations: 3
Essentials of Undergraduate Chemistry DSK Dr. Sunil Tekale, Anand V Dhirbassi 2024
Undergraduate Chemistry MS Anand V. Dhirbassi, Satish Jadhav, Arvind Aghao 2024
Polysaccharide-based biomaterials: delivery of therapeutics and biomedical applications S Jana, S Jana, AJ Domb Royal Society of Chemistry , 2022 2022 Citations: 12
Polysaccharide-based biomaterials: overview SU Tekale, AB Kanagare, AV Dhirbassi, AJ Domb, RP Pawar 2022 Citations: 6
Nanocatalysis: Synthesis of Bioactive Heterocycles KL Ameta, R Kant CRC Press , 2022 2022 Citations: 1
Recent advances in nanocatalyzed synthesis of triazoles and tetrazoles and their biological studies PM Jadhav, AB Kanagare, AB Dhirbassi, AB Tekale, RM Borade, ... Nanocatalysis, 177-200 , 2022 2022 Citations: 7
MOST CITED SCHOLAR PUBLICATIONS
Polysaccharide-based biomaterials: delivery of therapeutics and biomedical applications S Jana, S Jana, AJ Domb Royal Society of Chemistry , 2022 2022 Citations: 12
Recent advances in nanocatalyzed synthesis of triazoles and tetrazoles and their biological studies PM Jadhav, AB Kanagare, AB Dhirbassi, AB Tekale, RM Borade, ... Nanocatalysis, 177-200 , 2022 2022 Citations: 7
Polysaccharide-based biomaterials: overview SU Tekale, AB Kanagare, AV Dhirbassi, AJ Domb, RP Pawar 2022 Citations: 6
Environmentally Benign and Expeditious Access to 4‐Aryl Methylene‐isoxazole‐5 (4H)‐Ones Using Magnetically Separable Nanoparticles AV Dhirbassi, AD Tangade, SS Kauthale, L Kótai, T Pasinszki, RP Pawar, ... ChemistrySelect 9 (38), e202403387 , 2024 2024 Citations: 3
Synthesis of 2-Amino-4-aryl Thiazoles using Cu-NP/C Heterogeneous Catalyst AV Dhirbassi, SS Kauthale, AD Tangade, L Kótai, RP Pawar, SU Tekale Organic Preparations and Procedures International 57 (6), 542-548 , 2025 2025 Citations: 1
Carbon Microspheres Co-decorated with Nanosized Iron Sulfide and Magnetite Nanoparticles as a Magnetically Separable Heterogeneous Catalyst for the Green Synthesis of 4, 4 … AV Dhirbassi, SS Kauthale, L Kótai, T Pasinszki, RP Pawar, SU Tekale Russian Journal of Organic Chemistry 61 (3), 541-547 , 2025 2025 Citations: 1
Nanocatalysis: Synthesis of Bioactive Heterocycles KL Ameta, R Kant CRC Press , 2022 2022 Citations: 1
Environment-Friendly and Efficient Synthesis of 2-Aryl Quinoxalines by Using Carbon Microspheres Decorated with Copper Nanoparticles as a Heterogeneous Nanocatalyst AV Dhirbassi, AD Dhole, VG Kale, SS Kauthale, L Kótai, RP Pawar, ... Russian Journal of General Chemistry 96 (6), 129 , 2026 2026
Eco-Friendly Access to 2,4,5-Trisubstituted Imidazoles using (Cu 2 O)Cu@C-NPs as a Nanoparticulate Heterogeneous Catalyst AD Tangade, AV Dhirbassi, L Kótai, SU Tekale Organic Preparations and Procedures International, 1-7 , 2026 2026
A Green and Sustainable Access to 2,3-Dihydroquinazolin-4(1 H )-ones Using Nanosized Heterogeneous Metal/Metal Sulfide@Carbon Catalyst AD Tangade, AV Dhirbassi, SS Kauthale, L Kótai, RP Pawar, SU Tekale Russian Journal of Organic Chemistry 61 (12), 2300-2306 , 2025 2025
Principles of Undergraduate Chemistry SSK SU Tekale, AV Dhirbassi 2025
Foundations of Chemistry SUT SSK, Anand Dhirbassi 2025
Essentials of Undergraduate Chemistry DSK Dr. Sunil Tekale, Anand V Dhirbassi 2024
Undergraduate Chemistry MS Anand V. Dhirbassi, Satish Jadhav, Arvind Aghao 2024