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Kumar VH, Tamminana R. Copper‐catalyzed multicomponent green reaction approach: Synthesis of dihydropyrano [2, 3‐c] pyrazoles and evaluation of their anti‐cancer activity. J Heterocycl Chem 2022. [DOI: 10.1002/jhet.4555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Venkata Hema Kumar
- Department of Chemistry GITAM Deemed to be University, NH‐207, Doddaballapur Taluk Bengaluru Rural Karnataka Inida
| | - Ramana Tamminana
- Department of Chemistry GITAM Deemed to be University, NH‐207, Doddaballapur Taluk Bengaluru Rural Karnataka Inida
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2
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3
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Litim B, Djahoudi A, Meliani S, Boukhari A. Synthesis and potential antimicrobial activity of novel α-aminophosphonates derivatives bearing substituted quinoline or quinolone and thiazole moieties. Med Chem Res 2021; 31:60-74. [PMID: 34744408 PMCID: PMC8560884 DOI: 10.1007/s00044-021-02815-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Accepted: 10/17/2021] [Indexed: 12/19/2022]
Abstract
To develop novel antimicrobial agents, and based on the biologically active heterocyclic quinoline and thiazole substituted, a series of novel α-aminophosphonates (9a–h) and (10i–l) derivatives that incorporated quinoline or quinolone, and coumarylthiazole or 5-phenylthiazol-2-amine moieties were designed and synthesized via Kabachnik–Fields reaction in the presence of ionic liquid under ultrasound irradiation. All the new compounds were obtained in good yield with a simple workup and were confirmed using various spectroscopic methods. The in vitro antimicrobial activity of all synthesized compounds were screened in terms of MIC values against the selected strains of Gram-negative and Gram-positive bacteria and two fungal strains using the broth micro-dilution method. The results showed that most of the tested compounds showed moderate inhibitory activities against both Gram‐positive and ‐negative bacteria compared with reference drugs. The following compounds 9e, 9g, 9h, 9i and 9f, 9g, 9h, 10k, 10l are the most active against Gram-positive and Gram-negative bacteria strains, respectively, with MIC values ranging between 0.25 and 128 μg/mL. The synthesized compounds 9b, 9c, 9f, 9g, 9h, 10k, and 10l exhibited excellent antifungal inhibition with MIC values ranging between 0.25 and 32 μg/mL. Structure–activity relationship revealed that the presence of coumarylthiazole moiety and hydroxyl in the quinoline group increased the inhibitory activity against microbial strains pathogens. These results confirm that the synthesized compounds can be potential antimicrobial drugs candidate. ![]()
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Affiliation(s)
- Bilal Litim
- Laboratory of Organic Synthesis, Modeling and Optimization of Chemical Processes, Department of Chemistry, Faculty of Sciences, Badji Mokhtar-Annaba University, BP 12, 23000 Annaba, Algeria
| | - Abdelghani Djahoudi
- Laboratory of Microbiology, Department of Pharmacy, Faculty of Medicine, Badji Mokhtar-Annaba University, BP 205 Annaba, Algeria
| | - Saida Meliani
- Laboratory of Microbiology, Department of Biochemistry, Faculty of Sciences, Badji Mokhtar-Annaba University, BP 205 Annaba, Algeria
| | - Abbes Boukhari
- Laboratory of Organic Synthesis, Modeling and Optimization of Chemical Processes, Department of Chemistry, Faculty of Sciences, Badji Mokhtar-Annaba University, BP 12, 23000 Annaba, Algeria
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4
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Reddy MVK, Rao KY, Anusha G, Kumar GM, Damu AG, Reddy KR, Shetti NP, Aminabhavi TM, Reddy PVG. In-vitro evaluation of antioxidant and anticholinesterase activities of novel pyridine, quinoxaline and s-triazine derivatives. ENVIRONMENTAL RESEARCH 2021; 199:111320. [PMID: 33991570 DOI: 10.1016/j.envres.2021.111320] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 05/06/2021] [Accepted: 05/09/2021] [Indexed: 06/12/2023]
Abstract
Cholinesterase enzymes such as acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE) cause hydrolysis of acetylcholine (ACh), a neurotransmitter responsible for the cognitive functions of the brain such as acquiring knowledge and comprehension. Therefore, inhibition of these enzymes is an effective process to curb the progressive and fatal neurological Alzheimer's disease (AD). Herein, we explored the potential inhibitory activities of various pyridine, quinoxaline, and triazine derivatives (3a-k, 6a-j and 11a-h) against AChE and BuChE enzymes by following the modified Ellman's method. Further, anti-oxidant property of these libraries was monitored using DPPH (2,2'-diphenyl-1-picryl-hydrazylhydrate) radical scavenging analysis. From the studies, we identified that compounds 6e, 6f, 11b and 11f behaved as selective AChE inhibitors with IC50 values ranging from 7.23 to 10.35 μM. Further studies revealed good anti-oxidant activity by these compounds with IC50 values in the range of 14.80-27.22 μM. The kinetic studies of the active analogues demonstrated mixed-type of inhibition due to their interaction with both the catalytic active sites (CAS) and peripheral anionic sites (PAS) of the AChE. Additionally, molecular simulation in association with fluorescence and circular dichroism (CD) spectroscopic analyses explained strong affinities of inhibitors to bind with AChE enzyme at the physiological pH of 7.2. Binding constant values of 5.4 × 104, 4.3 × 104, 3.2 × 104 and 4.9 × 104 M-1 corresponding to free energy changes -5.593, -6.799, -6.605 and -8.104 KcalM-1 were obtained at 25 °C from fluorescence emission spectroscopic studies of 6e, 6f, 11b and 11f, respectively. Besides, CD spectroscopy deliberately explained the secondary structure of AChE partly unfolded upon binding with these dynamic molecules. Excellent in vitro profiles of distinct quinoxaline and triazine compounds highlighted them as the potential leads compared to pyridine derivatives, suggesting a path towards developing preventive or therapeutic targets to treat the Alzheimer's disease.
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Affiliation(s)
- M V K Reddy
- Department of Chemistry, Organic and Biomolecular Chemistry Laboratories, Yogi Vemana University, Kadapa, 516005, Andhra Pradesh, India
| | - K Y Rao
- Department of Chemistry, Natural Products Laboratories, Yogi Vemana University, Kadapa, 516005, Andhra Pradesh, India
| | - G Anusha
- Department of Chemistry, Organic and Biomolecular Chemistry Laboratories, Yogi Vemana University, Kadapa, 516005, Andhra Pradesh, India
| | - G M Kumar
- Department of Biotechnology and Bioinformatics, Yogi Vemana University, Kadapa, 516005, Andhra Pradesh, India
| | - A G Damu
- Department of Chemistry, Natural Products Laboratories, Yogi Vemana University, Kadapa, 516005, Andhra Pradesh, India
| | - Kakarla Raghava Reddy
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, NSW 2006, Australia.
| | - Nagaraj P Shetti
- School of Advanced Sciences, KLE Technological University, Vidyanagar, Hubballi, 580031, Karnataka, India
| | | | - Peddiahgari Vasu Govardhana Reddy
- Department of Chemistry, Organic and Biomolecular Chemistry Laboratories, Yogi Vemana University, Kadapa, 516005, Andhra Pradesh, India.
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Pendem VB, Tamminana R, Nannapaneni M. Iron-promoted sulfur sequestration for the substituent-dependent regioselective synthesis of tetrazoles and guanidines. J Sulphur Chem 2021. [DOI: 10.1080/17415993.2021.1909589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
| | - Ramana Tamminana
- Department of Chemistry, GITAM Deemed University, Bengaluru, India
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Govardhana Reddy PV, Rajendra Prasad Reddy B, Venkata Krishna Reddy M, Raghava Reddy K, Shetti NP, Saleh TA, Aminabhavi TM. A review on multicomponent reactions catalysed by zero-dimensional/one-dimensional titanium dioxide (TiO 2) nanomaterials: Promising green methodologies in organic chemistry. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 279:111603. [PMID: 33172705 DOI: 10.1016/j.jenvman.2020.111603] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Revised: 10/30/2020] [Accepted: 10/30/2020] [Indexed: 05/14/2023]
Abstract
Heterogeneous catalysis has currently become an emerging tool for the design and development of sustainable manufacturing processes in order to obtain advanced intermediates, fine chemicals, and bioactive molecules. This field has been considered efficient and eco-friendly, as it investigates the utilization of non-hazardous metals for atom-economical reactions. Nanomaterials have created a significant impact on scientific and engineering advancements due to their tunable properties with superior performance over their massive counterparts. Due to the increased demand for heterogeneous catalysts in industries and academia, different transition metal oxides have been made into substantial nanostructures. Among them, titanium dioxide (TiO2) nanomaterials have received more attention on account of their chemical stability, low cost, dual acid-base properties, good oxidation rate and refractive index. Different modifications of TiO2 extend their applications as active catalysts or catalyst supports in diverse catalytic processes, such as photovoltaics, lithium batteries, pigments and others. One-dimensional (1-D) TiO2 nanostructures such as nanotubes, nanowires and nanorods have achieved greater importance owing to the unique properties of improved porosity, decreased inter-crystalline contacts, large surface-to-volume ratio, superior dispersibility, amplified accessibility of hydroxyl (-OH) groups and presence of good concentrations of Brønsted/Lewis acid sites. Since the discovery, 1-D TiO2 nanostructures have served good photocatalytic applications, but were less explored in organic transformations. While many articles and reviews have covered the applications of 0-D and 1-D TiO2 nanostructured materials (NSMs) in photoelectrochemical reactions and solar cells, there are other interesting applications of these as well. In contrast to the conventional multi-step processes that utilise the stepwise formation of individual bonds, one-pot conversions based on multicomponent reactions (MCRs) have acquired much significance in contemporary organic synthesis. This paper presents a critical review on history, classification, design and synthetic utility of titania-based nanostructures, which could be used as robust solid-acid catalysts and catalyst supports for MCRs. Further, to put ideas into perspective, the introduction and applications of MCRs for various organic transformations have been discussed.
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Affiliation(s)
| | | | | | - Kakarla Raghava Reddy
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, NSW, 2006, Australia.
| | - Nagaraj P Shetti
- Center for Electrochemical Science & Materials, Department of Chemistry, K.L.E. Institute of Technology, Hubballi, 580 027, Karnataka, India
| | - Tawfik A Saleh
- Chemistry Department, King Fahd University of Petroleum & Minerals, Dhahran, 31261, Saudi Arabia
| | - Tejraj M Aminabhavi
- Department of Pharmaceutics, SETs' College of Pharmacy, Dharwad, 580 007, Karnataka, India.
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Ameur N, Bachir R. Study of 1D Titanate‐Based Materials –New Modification of the Synthesis Procedure and Surface Properties‐Recent Applications. ChemistrySelect 2020. [DOI: 10.1002/slct.201904539] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Nawal Ameur
- Laboratory of Catalysis and Synthesis in Organic Chemistry (LCSCO)University of Tlemcen BP 119 Tlemcen Algeria
- High School of Electrical and Energetic Engineering of Oran (ESGEE), Bir El Djir Algeria
| | - Redouane Bachir
- Laboratory of Catalysis and Synthesis in Organic Chemistry (LCSCO)University of Tlemcen BP 119 Tlemcen Algeria
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Bhoomireddy RPR, Narla LB, Peddiahgari VGR. Green synthesis of 1,2,3-triazoles via
Cu2
O NPs on hydrogen trititanate nanotubes promoted 1,3-dipolar cycloadditions. Appl Organomet Chem 2018. [DOI: 10.1002/aoc.4752] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
| | - L.G. Bhavani Narla
- Department of Humanities and Sciences; SV College of Engineering; Kadapa 516003 Andhra Pradesh India
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Reddy BRP, Reddy SS, Reddy PVG. Cu(OTf)2 loaded protonated trititanate nanotubes catalyzed reaction: a facile method for the synthesis of furo[2,3-b]quinoxalines. NEW J CHEM 2018. [DOI: 10.1039/c8nj00287h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient method is developed for the synthesis of furo[2,3-b]quinoxalines via one-pot three-component reaction of o-phenylenediamine, ethylglyoxalate and phenylacetylenes.
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Reddy BRP, Reddy PVG, Shankar MV, Reddy BN. CuI Supported on Protonated Trititanate Nanotubes: A Reusable Catalyst for the One-Pot Synthesis of Propargylamines via A3-Coupling. ASIAN J ORG CHEM 2017. [DOI: 10.1002/ajoc.201600623] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
| | | | - Muthukonda V. Shankar
- Nano Catalysis and Solar Fuels Research Laboratory; Department of Materials Science&Nanotechnology; Yogi Vemana University; Kadapa- 516 003 Andhra Pradesh India
| | - Bijivemula N. Reddy
- Department of Chemistry; Vellore Institute of Technology; Vellore- 632014 Tamil Nadu India
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Praveen Kumar D, Lakshmana Reddy N, Karthikeyan M, Chinnaiah N, Bramhaiah V, Durga Kumari V, Shankar MV. Synergistic effect of nanocavities in anatase TiO2 nanobelts for photocatalytic degradation of methyl orange dye in aqueous solution. J Colloid Interface Sci 2016; 477:201-8. [PMID: 27289430 DOI: 10.1016/j.jcis.2016.05.014] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2016] [Revised: 05/11/2016] [Accepted: 05/11/2016] [Indexed: 10/21/2022]
Abstract
Nanocavities are empty voids exposed on the surface of one dimensional TiO2 nanostructured material. Often, they exhibited beneficial optical and electrical properties that leads to efficient photocatalytic reactions. This study reports formation of nanocavities on anatase TiO2 nanobelts (TNB) through dehydroxylation of surface hydroxyl groups during calcination process (350-600°C). The morphological and crystal structure analysis of TNB-500, -550 and -600 displayed the nanobelts shape with high density of nano-size cavities and increase in average diameter with calcination temperature. The SAED patterns confirm the anatase TiO2 phase. The enhanced light absorption properties of biphasic anatase/TiO2-B and anatase TiO2 than H2Ti3O7 are attributed to transformation of crystal structure upon calcination process. The catalytic activity was evaluated for degradation of methyl orange dye in aqueous solution under solar light irradiation. The reaction variables such as calcination temperature, amount of catalyst and pH of the methyl orange dye solution were studied and discussed in detail. Under optimal experimental conditions TNB-550 photocatalyst displayed highest degradation performance about 8 folds higher than H2Ti3O7. The high performance is explained as due to synergistic properties of one dimensional anatase TiO2 with high density of nanocavities leading to one dimensional transfer of electrons and high absorption co-efficient in UV-A spectrum are suitable for efficient red-ox reactions.
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Affiliation(s)
- D Praveen Kumar
- Nano Catalysis and Solar Fuels Research Laboratory, Department of Materials Science & Nanotechnology, Yogi Vemana University, Vemanapuram, Kadapa 516003, Andhra Pradesh, India
| | - N Lakshmana Reddy
- Nano Catalysis and Solar Fuels Research Laboratory, Department of Materials Science & Nanotechnology, Yogi Vemana University, Vemanapuram, Kadapa 516003, Andhra Pradesh, India
| | - M Karthikeyan
- Nano Catalysis and Solar Fuels Research Laboratory, Department of Materials Science & Nanotechnology, Yogi Vemana University, Vemanapuram, Kadapa 516003, Andhra Pradesh, India
| | - N Chinnaiah
- Nano Catalysis and Solar Fuels Research Laboratory, Department of Materials Science & Nanotechnology, Yogi Vemana University, Vemanapuram, Kadapa 516003, Andhra Pradesh, India
| | - V Bramhaiah
- Nano Catalysis and Solar Fuels Research Laboratory, Department of Materials Science & Nanotechnology, Yogi Vemana University, Vemanapuram, Kadapa 516003, Andhra Pradesh, India
| | - V Durga Kumari
- Inorganic and Physical Chemistry Division, Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500007, Telangana, India
| | - M V Shankar
- Nano Catalysis and Solar Fuels Research Laboratory, Department of Materials Science & Nanotechnology, Yogi Vemana University, Vemanapuram, Kadapa 516003, Andhra Pradesh, India.
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REDDY NLAKSHMANA, KUMAR DPRAVEEN, SHANKAR MV. Co-catalyst free Titanate Nanorods for improved Hydrogen production under solar light irradiation. J CHEM SCI 2016. [DOI: 10.1007/s12039-016-1061-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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13
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Prasad Reddy BR, Govardhana Reddy PV, Kumar DP, Reddy BN, Shankar MV. Rapid synthesis of alkylaminophenols via the Petasis borono–Mannich reaction using protonated trititanate nanotubes as robust solid–acid catalysts. RSC Adv 2016. [DOI: 10.1039/c5ra25064a] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
The Petasis borono–Mannich reaction was applied to the synthesis of alkylaminophenols from o-hydroxybenzaldehydes, secondary amines and boronic acids in the presence of H2Ti3O7 nanotubes as reusable solid–acid catalysts.
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Affiliation(s)
| | | | - Dharani Praveen Kumar
- Nano Catalysis and Solar Fuels Research Laboratory
- Department of Materials Science & Nanotechnology
- Yogi Vemana University
- Kadapa-516 003
- India
| | | | - Muthukonda V. Shankar
- Nano Catalysis and Solar Fuels Research Laboratory
- Department of Materials Science & Nanotechnology
- Yogi Vemana University
- Kadapa-516 003
- India
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