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Kerru N, Gummidi L, Maddila SN, Gangu KK, Jonnalagadda SB. Four-component rapid protocol with nickel oxide loaded on fluorapatite as a sustainable catalyst for the synthesis of novel imidazole analogs. INORG CHEM COMMUN 2020. [DOI: 10.1016/j.inoche.2020.107935] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Kerru N, Gummidi L, Maddila SN, Bhaskaruni SVHS, Maddila S, Jonnalagadda SB. Green synthesis and characterisation of novel [1,3,4]thiadiazolo/benzo[4,5]thiazolo[3,2-a]pyrimidines via multicomponent reaction using vanadium oxide loaded on fluorapatite as a robust and sustainable catalyst. RSC Adv 2020; 10:19803-19810. [PMID: 35520453 PMCID: PMC9054220 DOI: 10.1039/d0ra02298e] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Accepted: 05/19/2020] [Indexed: 12/29/2022] Open
Abstract
We synthesised materials with different loadings of vanadia on fluorapatite (V2O5/FAp), fully characterised their structural properties using various spectral techniques including TEM, BET, XRD, FT-IR, SEM and EDX and assessed their prowess as catalysts. The 2.5% V2O5/FAp exhibited excellent activity for the synthesis of novel [1,3,4]thiadiazolo[3,2-a]pyrimidines and benzo[4,5]thiazolo[3,2-a]pyrimidines. The one-pot three-component fusion reaction between chosen substrates of 1,3,4-thiadiazole-amines or 2-amino-benzothiazole, aldehydes and active methylene compounds in ethanol solvent at room temperature gave an excellent yield of products (90–97%) in a swift reaction (25–30 min). The advantages of this protocol are rapid synthesis, mild reaction conditions, green solvent, easy work-up, eco-friendliness, reusability of catalyst and no need for column chromatography. We synthesized material with different loading of vanadia on fluorapatite (V2O5/FAp), and excellent activity was showed for the synthesis of pyrimidine derivatives (90–97%) in ethanol medium for short reaction time.![]()
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Affiliation(s)
- Nagaraju Kerru
- School of Chemistry & Physics
- University of KwaZulu-Natal
- Westville Campus
- Durban-4000
- South Africa
| | - Lalitha Gummidi
- School of Chemistry & Physics
- University of KwaZulu-Natal
- Westville Campus
- Durban-4000
- South Africa
| | - Surya Narayana Maddila
- School of Chemistry & Physics
- University of KwaZulu-Natal
- Westville Campus
- Durban-4000
- South Africa
| | | | - Suresh Maddila
- School of Chemistry & Physics
- University of KwaZulu-Natal
- Westville Campus
- Durban-4000
- South Africa
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Kerru N, Gummidi L, Bhaskaruni SVHS, Maddila SN, Singh P, Jonnalagadda SB. A comparison between observed and DFT calculations on structure of 5-(4-chlorophenyl)-2-amino-1,3,4-thiadiazole. Sci Rep 2019; 9:19280. [PMID: 31848439 PMCID: PMC6917775 DOI: 10.1038/s41598-019-55793-5] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Accepted: 11/30/2019] [Indexed: 01/09/2023] Open
Abstract
The crystal and molecular structure of 5-(4-chlorophenyl)-2-amino-1,3,4-thiadiazole 3 was reported, which was characterized by various spectroscopic techniques (FT-IR, NMR and HRMS) and single-crystal X-ray diffraction. The crystal structure 3 (C8H6ClN3S) crystallized in the orthorhombic space group Pna21 and the unit cell consisted of 8 asymmetric molecules. The unit cell parameters were a = 11.2027(2) Å, b = 7.6705(2) Å, c = 21.2166(6) Å, α = β = γ = 90°, V = 1823.15(8) Å3, Z = 8. In addition, the structural geometry (bond lengths, bond angles, and torsion angles), the electronic properties of mono and dimeric forms of compound 3 were calculated by using the density functional theory (DFT) method at B3LYP level 6-31+ G(d,p), 6-31++ G(d,p) and 6-311+ G(d,p) basis sets in ground state. A good correlation was found (R2 = 0.998) between the observed and theoretical vibrational frequencies. Frontier molecular orbitals (HOMO and LUMO) and Molecular Electrostatic Potential map of the compound was produced by using the optimized structures. The NBO analysis was suggested that the molecular system contains N-H…N hydrogen bonding, strong conjugative interactions and the molecule become more polarized owing to the movement of π-electron cloud from donor to acceptor. The calculated structural and geometrical results were in good rational agreement with the experimental X-ray crystal structure data of 1,3,4-thiadiazol-2-amine, 3. The compound 3 exhibited n→π* UV absorption peak of UV cutoff edge, and great magnitude of the first-order hyperpolarizability was observed. The obtained results suggest that compound 3 could have potential application as NLO material. Therefore, this study provides valuable insight experimentally and theoretically, for designing new chemical entities to meet the demands of specific applications.
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Affiliation(s)
- Nagaraju Kerru
- School of Chemistry & Physics, University of KwaZulu-Natal, Westville Campus, Chiltern Hills, P/Bag X54001, Durban, 4000, South Africa
| | - Lalitha Gummidi
- School of Chemistry & Physics, University of KwaZulu-Natal, Westville Campus, Chiltern Hills, P/Bag X54001, Durban, 4000, South Africa
| | - Sandeep V H S Bhaskaruni
- School of Chemistry & Physics, University of KwaZulu-Natal, Westville Campus, Chiltern Hills, P/Bag X54001, Durban, 4000, South Africa
| | - Surya Narayana Maddila
- School of Chemistry & Physics, University of KwaZulu-Natal, Westville Campus, Chiltern Hills, P/Bag X54001, Durban, 4000, South Africa
| | - Parvesh Singh
- School of Chemistry & Physics, University of KwaZulu-Natal, Westville Campus, Chiltern Hills, P/Bag X54001, Durban, 4000, South Africa
| | - Sreekantha B Jonnalagadda
- School of Chemistry & Physics, University of KwaZulu-Natal, Westville Campus, Chiltern Hills, P/Bag X54001, Durban, 4000, South Africa.
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Khumalo MR, Maddila SN, Maddila S, Jonnalagadda SB. A facile and one-pot synthesis of new tetrahydrobenzo[b]pyrans in water under microwave irradiation. BMC Chem 2019; 13:132. [PMID: 31788672 PMCID: PMC6878704 DOI: 10.1186/s13065-019-0651-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Accepted: 11/13/2019] [Indexed: 11/29/2022] Open
Abstract
Eleven new tetrahydrobenzo[b]pyran derivatives were synthesized via a three component reaction of different aromatic aldehydes, methyl cyanoacetate and 1,3-cyclohexadione, with water as solvent under catalyst-free microwave irradiation. The structures of all the new molecules were well analysed and their structures established by using various spectral techniques (1H NMR, 13C NMR, 15N NMR and HRMS). Various advantages of reported protocol are the ease of preparation, short reaction times (10 min), aqueous solvent and excellent yields (89–98%). Additionally, this method provides a clean access to the desired products by simple workup.![]()
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Affiliation(s)
- Mandlenkosi Robert Khumalo
- School of Chemistry & Physics, University of KwaZulu-Natal, Westville Campus, Chiltern Hills, Durban, 4000 South Africa
| | - Surya Narayana Maddila
- School of Chemistry & Physics, University of KwaZulu-Natal, Westville Campus, Chiltern Hills, Durban, 4000 South Africa
| | - Suresh Maddila
- School of Chemistry & Physics, University of KwaZulu-Natal, Westville Campus, Chiltern Hills, Durban, 4000 South Africa
| | - Sreekantha B Jonnalagadda
- School of Chemistry & Physics, University of KwaZulu-Natal, Westville Campus, Chiltern Hills, Durban, 4000 South Africa
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Khumalo MR, Maddila SN, Maddila S, Jonnalagadda SB. Microwave‐Assisted One‐Step Four‐Component Reaction for Synthesis of 1,4‐Dihydropyridines Catalyzed by Triethylamine. ChemistrySelect 2019. [DOI: 10.1002/slct.201903222] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Mandlenkosi Robert Khumalo
- School of Chemistry & PhysicsUniversity of KwaZulu-NatalWestville Campus Private Bag X54001 Durban 4000 South Africa
| | - Surya Narayana Maddila
- School of Chemistry & PhysicsUniversity of KwaZulu-NatalWestville Campus Private Bag X54001 Durban 4000 South Africa
| | - Suresh Maddila
- School of Chemistry & PhysicsUniversity of KwaZulu-NatalWestville Campus Private Bag X54001 Durban 4000 South Africa
| | - Sreekantha B. Jonnalagadda
- School of Chemistry & PhysicsUniversity of KwaZulu-NatalWestville Campus Private Bag X54001 Durban 4000 South Africa
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Kerru N, Bhaskaruni SVHS, Gummidi L, Maddila SN, Maddila S, Jonnalagadda SB. Recent advances in heterogeneous catalysts for the synthesis of imidazole derivatives. SYNTHETIC COMMUN 2019. [DOI: 10.1080/00397911.2019.1639755] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Nagaraju Kerru
- School of Chemistry and Physics, University of KwaZulu-Natal, Durban, South Africa
| | | | - Lalitha Gummidi
- School of Chemistry and Physics, University of KwaZulu-Natal, Durban, South Africa
| | | | - Suresh Maddila
- School of Chemistry and Physics, University of KwaZulu-Natal, Durban, South Africa
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Maddila S, Gorle S, Shabalala S, Oyetade O, Maddila SN, Lavanya P, Jonnalagadda SB. Ultrasound mediated green synthesis of pyrano[2,3-c]pyrazoles by using Mn doped ZrO2. ARAB J CHEM 2019. [DOI: 10.1016/j.arabjc.2016.04.016] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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Maddila SN, Maddila S, Khumalo M, Bhaskaruni SV, Jonnalagadda SB. An eco-friendly approach for synthesis of novel substituted 4H-chromenes in aqueous ethanol under ultra-sonication with 94% atom economy. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.03.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Kerru N, Bhaskaruni SVHS, Gummidi L, Maddila SN, Singh P, Jonnalagadda SB. Efficient synthesis of novel pyrazole-linked 1,2,4-triazolidine-3-thiones using bismuth on zirconium oxide as a recyclable catalyst in aqueous medium. Mol Divers 2019; 24:345-354. [PMID: 31098860 DOI: 10.1007/s11030-019-09957-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Accepted: 05/08/2019] [Indexed: 11/24/2022]
Abstract
The Bi2O3 loading on ZrO2 as heterogeneous catalyst was established as an extremely efficient catalyst for the synthesis of a series of novel 5-(1-(2,4-dinitrophenyl)-3-substituted-phenyl-1H-pyrazol-4-yl)-1,2,4-triazolidine-3-thione derivatives (3a-o) with high yields (90-96%) by reaction of 1-(2,4-dinitrophenyl)-3-substituted-phenyl-1H-pyrazole-4-carbaldehydes and thiosemicarbazide using water as a greener solvent at 80 °C within 30-45 min. Materials with different percentages of Bi2O3 on ZrO2 were prepared by simple wet impregnation method. The synthesized material has been characterized by various techniques (XRD, TEM, SEM, BET). 2.5% Bi2O3/ZrO2 proved superior catalyst. The Bi2O3/ZrO2 catalyst is easily recoverable and reused up to sixth run with no loss of activity. Excellent yields, short reaction time, avoidance of hazardous solvents, and no need for chromatographic purifications are the proven advantages.
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Affiliation(s)
- Nagaraju Kerru
- School of Chemistry and Physics, University of KwaZulu-Natal, Westville Campus, Chiltern Hills, Durban, 4000, South Africa
| | - Sandeep V H S Bhaskaruni
- School of Chemistry and Physics, University of KwaZulu-Natal, Westville Campus, Chiltern Hills, Durban, 4000, South Africa
| | - Lalitha Gummidi
- School of Chemistry and Physics, University of KwaZulu-Natal, Westville Campus, Chiltern Hills, Durban, 4000, South Africa
| | - Surya Narayana Maddila
- School of Chemistry and Physics, University of KwaZulu-Natal, Westville Campus, Chiltern Hills, Durban, 4000, South Africa
| | - Parvesh Singh
- School of Chemistry and Physics, University of KwaZulu-Natal, Westville Campus, Chiltern Hills, Durban, 4000, South Africa
| | - Sreekantha B Jonnalagadda
- School of Chemistry and Physics, University of KwaZulu-Natal, Westville Campus, Chiltern Hills, Durban, 4000, South Africa.
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Kerru N, Bhaskaruni SV, Gummidi L, Maddila SN, Rana S, Singh P, Jonnalagadda SB. Synthesis of novel pyrazole‐based triazolidin‐3‐one derivatives by using ZnO/ZrO
2
as a reusable catalyst under green conditions. Appl Organomet Chem 2019. [DOI: 10.1002/aoc.4722] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Nagaraju Kerru
- School of Chemistry & PhysicsUniversity of KwaZulu‐Natal Westville Campus, Chiltern Hills Durban 4000 South Africa
| | - Sandeep V.H.S. Bhaskaruni
- School of Chemistry & PhysicsUniversity of KwaZulu‐Natal Westville Campus, Chiltern Hills Durban 4000 South Africa
| | - Lalitha Gummidi
- School of Chemistry & PhysicsUniversity of KwaZulu‐Natal Westville Campus, Chiltern Hills Durban 4000 South Africa
| | - Surya Narayana Maddila
- School of Chemistry & PhysicsUniversity of KwaZulu‐Natal Westville Campus, Chiltern Hills Durban 4000 South Africa
| | - Surjyakanta Rana
- School of Chemistry & PhysicsUniversity of KwaZulu‐Natal Westville Campus, Chiltern Hills Durban 4000 South Africa
| | - Parvesh Singh
- School of Chemistry & PhysicsUniversity of KwaZulu‐Natal Westville Campus, Chiltern Hills Durban 4000 South Africa
| | - Sreekantha B. Jonnalagadda
- School of Chemistry & PhysicsUniversity of KwaZulu‐Natal Westville Campus, Chiltern Hills Durban 4000 South Africa
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11
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Kerru N, Maddila SN, Maddila S, Sobhanapuram S, Jonnalagadda SB. Synthesis and antimicrobial activity of novel thienopyrimidine linked rhodanine derivatives. CAN J CHEM 2019. [DOI: 10.1139/cjc-2018-0220] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
This work presents the preparation of a new series of N-(substituted phenyl)-2-(4-oxo-5-(4-(thieno[2,3-d]-pyrimidin-4-yloxy)benzylidene)-2-thioxothiazolidin-3-yl)acetamide derivatives (8a–8l). A condensation reaction of thienopyrimidin-2-thioxothiazolidin-4-one derivative (5) with various 2-chloro-N-phenylacetamides (7a–7l) was employed to afford the new thienopyrimidine tagged rhodanine derivatives under acetone solvent in the presence of potassium carbonate (K2CO3). All of the novel target molecules were characterized by IR, 1H NMR, 13C NMR, and LC–MS spectral analyses and were screened for their in vitro antimicrobial activity by using the broth dilution method. Compounds 8c, 8g, and 8h found to have antibacterial potency against E. coli, B. subtilis, B. cereus, and K. pneumonia with minimum inhibitory concentrations (MICs) of 3.25–6.25 μg/mL compared with the standard Gentamicin. Compounds 8c and 8f demonstrated better antifungal potency (MIC = 3.25–6.25 μg/mL) against A. flavus, A. niger, P. marneffei, and C. albicans when compared with Fluconazole.
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Affiliation(s)
- Nagaraju Kerru
- School of Chemistry & Physics, University of KwaZulu-Natal, Westville Campus, Chilten Hills, Private Bag 54001, Durban-4000, South Africa
| | - Surya Narayana Maddila
- School of Chemistry & Physics, University of KwaZulu-Natal, Westville Campus, Chilten Hills, Private Bag 54001, Durban-4000, South Africa
| | - Suresh Maddila
- School of Chemistry & Physics, University of KwaZulu-Natal, Westville Campus, Chilten Hills, Private Bag 54001, Durban-4000, South Africa
- GITAM Institute of Sciences, GITAM University, Visakhapatnam, Andhra Pradesh, India
| | | | - Sreekantha B. Jonnalagadda
- School of Chemistry & Physics, University of KwaZulu-Natal, Westville Campus, Chilten Hills, Private Bag 54001, Durban-4000, South Africa
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Robert Khumalo M, Maddila SN, Maddila S, Jonnalagadda SB. A multicomponent, facile and catalyst-free microwave-assisted protocol for the synthesis of pyrazolo-[3,4-b]-quinolines under green conditions. RSC Adv 2019; 9:30768-30772. [PMID: 35529349 PMCID: PMC9072209 DOI: 10.1039/c9ra04604f] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Accepted: 09/22/2019] [Indexed: 12/23/2022] Open
Abstract
A facile, swift and ecofriendly microwave-assisted multi-component/one-pot protocol is designed for the synthesis of novel pyrazolo-[3,4-b]-quinolines at ambient temperature in aqueous ethanol as a reaction medium. The 18 novel pyrazolo-[3,4-b]-quinoline derivatives were synthesized by fusion of chosen aryl aldehyde, dimedone and 5-amino-3-methyl-1-phenylpyrazole in excellent yields (91–98%). All the molecular structures were confirmed by 1H-NMR, 15N-NMR, 13C-NMR, and HRMS data analysis. Operational simplicity, easy handling, one-step simple workup procedure, mild reaction conditions, short reaction time (≤10 min), high selectivity and no by-product formation are the striking features of the protocol. A facile, swift and ecofriendly microwave-assisted multi-component/one-pot protocol is designed for the synthesis of novel pyrazolo-[3,4-b]-quinolines at ambient temperature in aqueous ethanol as a reaction medium.![]()
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Affiliation(s)
| | | | - Suresh Maddila
- School of Chemistry & Physics
- University of KwaZulu-Natal
- Durban
- South Africa
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13
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Affiliation(s)
- Kotiah Yalagala
- School of Chemistry & Physics, University of KwaZulu-Natal, Westville Campus, Chiltern Hills, Durban-4000, South Africa
| | - Sreekantha B. Jonnalagadda
- School of Chemistry & Physics, University of KwaZulu-Natal, Westville Campus, Chiltern Hills, Durban-4000, South Africa
| | - Suresh Maddila
- School of Chemistry & Physics, University of KwaZulu-Natal, Westville Campus, Chiltern Hills, Durban-4000, South Africa
| | - Surjyakanta Rana
- School of Chemistry & Physics, University of KwaZulu-Natal, Westville Campus, Chiltern Hills, Durban-4000, South Africa
| | - Surya Narayana Maddila
- School of Chemistry & Physics, University of KwaZulu-Natal, Westville Campus, Chiltern Hills, Durban-4000, South Africa
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Maddila SN, Maddila S, Gangu KK, van Zyl WE, Jonnalagadda SB. Sm2O3/Fluoroapatite as a reusable catalyst for the facile, green, one-pot synthesis of triazolidine-3-thione derivatives under aqueous conditions. J Fluor Chem 2017. [DOI: 10.1016/j.jfluchem.2017.01.012] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Gangu KK, Maddila S, Maddila SN, Jonnalagadda SB. Novel iron doped calcium oxalates as promising heterogeneous catalysts for one-pot multi-component synthesis of pyranopyrazoles. RSC Adv 2017. [DOI: 10.1039/c6ra25372e] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
The co-precipitation method using a surface modifier, glutamic acid was employed in the design of iron doped calcium oxalates (Fe-CaOx).
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Affiliation(s)
- Kranthi Kumar Gangu
- School of Chemistry & Physics
- University of KwaZulu-Natal
- Durban-4000
- South Africa
| | - Suresh Maddila
- School of Chemistry & Physics
- University of KwaZulu-Natal
- Durban-4000
- South Africa
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Narayana Maddila S, Maddila S, E. van Zyl W, B. Jonnalagadda S. Ru-Hydroxyapatite: An Efficient and Reusable Catalyst for the Multicomponent Synthesis of Pyranopyrazoles under Facile Green Conditions. Curr Org Synth 2016. [DOI: 10.2174/1570179413666151218202439] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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17
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Gangu KK, Maddila S, Maddila SN, Jonnalagadda SB. Nanostructured Samarium Doped Fluorapatites and Their Catalytic Activity towards Synthesis of 1,2,4-Triazoles. Molecules 2016; 21:molecules21101281. [PMID: 27669208 PMCID: PMC6273585 DOI: 10.3390/molecules21101281] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Revised: 09/16/2016] [Accepted: 09/20/2016] [Indexed: 11/16/2022] Open
Abstract
An investigation was conducted into the influence of the amino acids as organic modifiers in the facile synthesis of metal incorporated fluorapatites (FAp) and their properties. The nanostructured Sm doped fluorapatites (Sm-FAp) were prepared by a co-precipitation method using four different amino acids, namely glutamic acid, aspartic acid, glycine and histidine. The materials were characterized by various techniques including X-ray diffraction (XRD), Fourier transform infra-red spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), high resolution transmission electron microscopy (HR-TEM), N₂-adsorption/desorption isotherm, temperature programmed desorption (TPD) and fluorescence spectrophotometry. Under similar conditions, Sm-FAp prepared using different amino acids exhibited distinctly different morphological structures, surface area and pore properties. Their activity as catalysts was assessed and Sm-FAp/Glycine displayed excellent efficiency in the synthesis of 1,2,4-triazole catalyzing the reaction between 2-nitrobenzaldehyde and thiosemicarbazide with exceptional selectivity and 98% yield in a short time interval (10 min). The study provides an insight into the role of organic modifiers as controllers of nucleation, growth and aggregation which significantly influence the nature and activity of the catalytic sites on Sm-FAp. Sm-FAp could also have potential as photoactive material.
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Affiliation(s)
- Kranthi Kumar Gangu
- School of Chemistry & Physics, University of KwaZulu-Natal, Westville Campus, Chiltern Hills, Durban-4000, South Africa.
| | - Suresh Maddila
- School of Chemistry & Physics, University of KwaZulu-Natal, Westville Campus, Chiltern Hills, Durban-4000, South Africa.
| | - Surya Narayana Maddila
- School of Chemistry & Physics, University of KwaZulu-Natal, Westville Campus, Chiltern Hills, Durban-4000, South Africa.
| | - Sreekantha B Jonnalagadda
- School of Chemistry & Physics, University of KwaZulu-Natal, Westville Campus, Chiltern Hills, Durban-4000, South Africa.
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18
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Gangu KK, Maddila S, Maddila SN, Jonnalagadda SB. Efficient synthetic route for thio-triazole derivatives catalyzed by iron doped fluorapatite. Res Chem Intermed 2016. [DOI: 10.1007/s11164-016-2730-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Gangu KK, Maddila S, Maddila SN, Jonnalagadda SB. Decorated multi-walled carbon nanotubes with Sm doped fluorapatites: synthesis, characterization and catalytic activity. RSC Adv 2016. [DOI: 10.1039/c6ra08733g] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Novel and sustainable heterogeneous catalysts, namely, multi-walled carbon nanotubes (MWCNT) decorated with Sm doped fluorapatite nanocomposites (MWCNT/Sm-FAp) were prepared with different loadings of Sm (1%, 2%, 3%, 5%, and 7%).
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Affiliation(s)
- Kranthi Kumar Gangu
- School of Chemistry & Physics
- University of KwaZulu-Natal
- Durban 4000
- South Africa
| | - Suresh Maddila
- School of Chemistry & Physics
- University of KwaZulu-Natal
- Durban 4000
- South Africa
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Maddila SN, Maddila S, van Zyl WE, Jonnalagadda SB. Ceria-Vanadia/Silica-Catalyzed Cascade for C-C and C-O Bond Activation: Green One-Pot Synthesis of 2-Amino-3-cyano-4H-pyrans. ChemistryOpen 2015; 5:38-42. [PMID: 27308209 PMCID: PMC4906492 DOI: 10.1002/open.201500159] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Indexed: 11/06/2022] Open
Abstract
We designed a ceria-vanadia/silica (Ce-V/SiO2) heterogeneous catalyst and used it for the green and efficient synthesis of 2-amino-3-cyano-4H-pyran derivatives. The green reaction was a multicomponent one-pot condensation of 5,5-dimethylcyclohexane-1,3-dione, aromatic aldehyde, and malononitrile in an eco-compatible solvent (ethanol). The catalyst was synthesized and fully characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and Brunauer-Emmett-Teller (BET) surface area analysis. The reported procedure offers a number of advantages including decreased reaction times, mild conditions, high yields, operational simplicity, and environmentally benign and simple work-up procedures. Furthermore, the catalyst is economical, fully recyclable, and reusable for over five runs while preserving its high activity. The synthesized 2-amino-3-cyano-4H-pyran products can later be used for pharmaceutical purposes.
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Affiliation(s)
- Surya Narayana Maddila
- School of Chemistry & Physics University of KwaZulu-Natal Westville Campus Chiltern Hills Durban 4000 South Africa
| | - Suresh Maddila
- School of Chemistry & Physics University of KwaZulu-Natal Westville Campus Chiltern Hills Durban 4000 South Africa
| | - Werner E van Zyl
- School of Chemistry & Physics University of KwaZulu-Natal Westville Campus Chiltern Hills Durban 4000 South Africa
| | - Sreekantha B Jonnalagadda
- School of Chemistry & Physics University of KwaZulu-Natal Westville Campus Chiltern Hills Durban 4000 South Africa
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Maddila SN, Maddila S, van Zyl WE, Jonnalagadda SB. Mn doped ZrO2 as a green, efficient and reusable heterogeneous catalyst for the multicomponent synthesis of pyrano[2,3-d]-pyrimidine derivatives. RSC Adv 2015. [DOI: 10.1039/c5ra06373f] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A simple and an efficient method has been developed for the one-pot multicomponent synthesis of pyrano[2,3-d]-pyrimidine derivatives.
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Affiliation(s)
| | - Suresh Maddila
- School of Chemistry & Physics
- University of KwaZulu-Natal
- Durban-4000
- South Africa
| | - Werner E. van Zyl
- School of Chemistry & Physics
- University of KwaZulu-Natal
- Durban-4000
- South Africa
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