1
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Rajput D, Jan G, Karuppasamy M, Bhuvanesh N, Nagarajan S, Maheswari CU, Menéndez JC, Sridharan V. Rapid Assembly of Functionalized 2 H-Chromenes and 1,2-Dihydroquinolines via Microwave-Assisted Secondary Amine-Catalyzed Cascade Annulation of 2- O/ N-Propargylarylaldehydes with 2,6-Dialkylphenols. J Org Chem 2023; 88:11778-11792. [PMID: 37556760 DOI: 10.1021/acs.joc.3c01082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/11/2023]
Abstract
An efficient, secondary amine-catalyzed cascade annulation of 2-O/N-propargylarylaldehydes with 2,6-dialkylphenols was established to access biologically relevant functionalized 2H-chromenes and 1,2-dihydroquinolines tethered with a synthetically useful p-quinone methide scaffold in high yields under microwave irradiation and conventional heating conditions. The microwave-assisted strategy was convenient, clean, rapid, and high yielding in which the reactions were completed in just 15 min, and the yields obtained were up to 95%. This highly atom-economical domino process constructed two new C-C double bonds and a six-membered O/N-heterocyclic ring in a single synthetic operation. Its mechanism process was rationalized as involving sequential iminium ion formation, nucleophilic addition, and intramolecular annulation steps. Furthermore, the synthesized 2H-chromene derivatives were transformed into valuable indeno[2,1-c]chromenes, 5H-indeno[2,1-c]quinolines, and oxireno[2,3-c]chromene via a palladium-catalyzed double C-H bond activation process and epoxidation, respectively.
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Affiliation(s)
- Diksha Rajput
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu 181143, Jammu and Kashmir, India
| | - Gowsia Jan
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu 181143, Jammu and Kashmir, India
| | - Muthu Karuppasamy
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu 181143, Jammu and Kashmir, India
| | - Nattamai Bhuvanesh
- Department of Chemistry, Texas A & M University, College Station, Texas 77843, United States
| | - Subbiah Nagarajan
- Department of Chemistry, National Institute of Technology, Warangal, Warangal 506004, Telangana, India
| | - C Uma Maheswari
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - J Carlos Menéndez
- Unidad de Química Orgánica y Farmacéutica, Departamento de Química en Ciencias Farmacéuticas, Facultad de Farmacia, Universidad Complutense de Madrid, Madrid 28040, Spain
| | - Vellaisamy Sridharan
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu 181143, Jammu and Kashmir, India
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2
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Rajkumar DB, Gnanaoli K, Puhazhendhi A, Arunachalam T, Nagarajan S, Sridharan V, Sivalingam S, Maheswari CU. Iodine-catalyzed three-component annulation: access to highly fluorescent trisubstituted thiophenes. Chem Commun (Camb) 2023; 59:10129-10132. [PMID: 37494020 DOI: 10.1039/d3cc02711b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/27/2023]
Abstract
An efficient synthesis of highly fluorescent trisubstituted thiophenes was achieved via iodine-catalyzed, base-promoted annulation employing elemental sulfur as a sulfur source. The compounds exhibit excellent photophysical properties like solid-state fluorescence, high quantum yield and solvatochromism. As these thiophene derivatives have potential application in the development of optoelectronic devices, gram-scale synthesis of the desired heterocycles was demonstrated.
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Affiliation(s)
- Deepan Babu Rajkumar
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, India.
| | - Karthiyayini Gnanaoli
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, India.
| | - Arulmozhi Puhazhendhi
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, India.
| | | | - Subbiah Nagarajan
- Department of Chemistry, National Institute of Technology-Warangal, Warangal-506004, India
| | - Vellaisamy Sridharan
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu-181143, J&K, India
| | - Soumya Sivalingam
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, India.
| | - C Uma Maheswari
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, India.
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3
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Rajput D, Tsering D, Karuppasamy M, Kapoor KK, Nagarajan S, Maheswari CU, Bhuvanesh N, Sridharan V. Diversity-Oriented Synthesis of Benzo[ f][1,4]oxazepine-, 2 H-Chromene-, and 1,2-Dihydroquinoline-Fused Polycyclic Nitrogen Heterocycles under Microwave-Assisted Conditions. J Org Chem 2023. [PMID: 37318181 DOI: 10.1021/acs.joc.3c00552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
An efficient, diversity-oriented synthesis of oxazepino[5,4-b]quinazolin-9-ones, 6H-chromeno[4,3-b]quinolines, and dibenzo[b,h][1,6]naphthyridines was established involving a substrate-based approach under microwave-assisted and conventional heating conditions in high yields (up to 88%). The CuBr2-catalyzed, chemoselective cascade annulation of O-propargylated 2-hydroxybenzaldehydes and 2-aminobenzamides delivered oxazepino[5,4-b]quinazolin-9-ones involving a 6-exo-trig cyclization-air oxidation-1,3-proton shift-7-exo-dig cyclization sequence. This one-pot process showed excellent atom economy (-H2O) and constructed two new heterocyclic rings (six- and seven-membered) and three new C-N bonds in a single synthetic operation. On the other side of diversification, the reaction between O/N-propargylated 2-hydroxy/aminobenzaldehydes and 2-aminobenzyl alcohols delivered 6H-chromeno[4,3-b]quinolines and dibenzo[b,h][1,6]naphthyridines involving sequential imine formation-[4 + 2] hetero-Diels-Alder reaction-aromatization steps. The influence of microwave assistance was superior to conventional heating, where the reactions were clean, rapid, and completed in 15 min, and the conventional heating required a longer reaction time at a relatively elevated temperature.
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Affiliation(s)
- Diksha Rajput
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu 181143, Jammu and Kashmir, India
| | - Dolma Tsering
- Department of Chemistry, University of Jammu, Jammu 180006, Jammu and Kashmir, India
| | - Muthu Karuppasamy
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu 181143, Jammu and Kashmir, India
| | - Kamal K Kapoor
- Department of Chemistry, University of Jammu, Jammu 180006, Jammu and Kashmir, India
| | - Subbiah Nagarajan
- Department of Chemistry, National Institute of Technology Warangal, Warangal 506004, Telangana, India
| | - C Uma Maheswari
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur613401, Tamil Nadu, India
| | - Nattamai Bhuvanesh
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Vellaisamy Sridharan
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu 181143, Jammu and Kashmir, India
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4
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Rachamalla AK, Potu S, Rebaka VP, Banoo T, Kumar Y, Uma Maheswari C, Sridharan V, Rajaboina RK, Subbiah N. Electronically Robust Self-assembled Supramolecular Gel as a Potential Material in Triboelectric Nanogenerator. Chemistry 2023:e202301076. [PMID: 37021766 DOI: 10.1002/chem.202301076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Accepted: 04/06/2023] [Indexed: 04/07/2023]
Abstract
A series of self-assembling gluconamide conjugated naphthalimide amphiphiles (GCNA) was synthesized and the self-assembly of GCNA into gel rendered an increased electron density in naphthalimide moiety with overall change in energy of 15.33x10-32 J via J-type aggregation. SEM analysis and X-ray diffraction underpinning the nanofibrillar formation, and rheology confirmed the processablity and material fabrication. The enriched electron density in the aggregated GCNA4 via cooperative intermolecular non-covalent interactions makes it as effective electron donor in the fabrication of triboelectric nanogenerators (TENG). The TENG based on GCNA4-polydimethylsiloxane (PDMS) triboelectric pair generated an output voltage, current and power density of ~250 V, 40 μA and ~622 mW/m2 respectively, which is almost 2.4 times better in performance than the amorphous GCNA4 based TENG. The fabricated TENG can power-up 240 LEDs, wrist watch, thermometer, calculator and hygrometer.
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Affiliation(s)
| | - Supraja Potu
- NIT Warangal: National Institute of Technology Warangal, Physics, INDIA
| | - Vara Prasad Rebaka
- NIT Warangal: National Institute of Technology Warangal, Chemistry, INDIA
| | - Tohira Banoo
- NIT Warangal: National Institute of Technology Warangal, Chemistry, INDIA
| | - Yogendra Kumar
- NIT Warangal: National Institute of Technology Warangal, Chemistry, INDIA
| | - C Uma Maheswari
- SASTRA Deemed University: Shanmugha Arts Science Technology and Research Academy, Chemistry, INDIA
| | | | | | - Nagarajan Subbiah
- National Institute of Technology Warangal, Department of Chemistry, National Institute of Technology Warangal, Hanumakonda, 506004, Hanumakonda, INDIA
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Jandial T, Gupta A, Jan G, Karuppasamy M, Nagarajan S, Maheswari CU, Sridharan V. A microwave-assisted intramolecular aminopalladation-triggered domino sequence: an atom economical route to 5,10-dihydroindeno[1,2- b]indoles. Org Biomol Chem 2023; 21:3121-3131. [PMID: 36960815 DOI: 10.1039/d3ob00041a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/25/2023]
Abstract
A microwave-assisted, palladium(II)-catalyzed cascade reaction of 2-alkynylanilines tethered with an α,β-unsaturated carbonyl moiety was established to access 5,10-dihydroindeno[1,2-b]indoles in high yields (up to 84%) in a short reaction time. This operationally simple cascade process shows 100% atom economy and allows the construction of two new five-membered rings and two new (1 C-C and 1 C-N) bonds in a single synthetic attempt. The mechanistic pathway of this reaction is visualized involving intramolecular aminopalladation (5-endo-dig) followed by carbopalladation (olefin insertion) and protonolysis steps. A systematic comparison between microwave irradiation and conventional heating methods was also performed to demonstrate the supremacy of the microwave-assisted approach. This domino reaction requires no protecting groups for the amino group and the palladium catalyst needs no ligands. To the best of our knowledge, this is the first report on microwave-assisted nucleopalladation-initiated cascade transformation.
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Affiliation(s)
- Tanvi Jandial
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu-181143, J&K, India.
| | - Anish Gupta
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu-181143, J&K, India.
| | - Gowsia Jan
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu-181143, J&K, India.
| | - Muthu Karuppasamy
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu-181143, J&K, India.
| | - Subbiah Nagarajan
- Department of Chemistry, National Institute of Technology, Warangal, Warangal-506004, Telangana, India
| | - C Uma Maheswari
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, Tamil Nadu, India
| | - Vellaisamy Sridharan
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu-181143, J&K, India.
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6
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Vinoth P, Karuppasamy M, Gupta A, Nagarajan S, Maheswari CU, Sridharan V. Intramolecular oxypalladation-initiated domino sequence: One-pot, two-step regioselective synthesis of isoquinolines. Tetrahedron 2023. [DOI: 10.1016/j.tet.2023.133272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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7
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Gupta A, Jandial T, Karuppasamy M, Bhuvanesh N, Nagarajan S, Maheswari CU, Sridharan V. Palladium-Catalyzed Intramolecular Oxypalladation-Initiated Cascade: Solvent-Dependent Chemodivergent Approach to Functionalized Benzazepines and Tetrahydroquinolines. Chem Commun (Camb) 2023; 59:5233-5236. [PMID: 37040145 DOI: 10.1039/d3cc01370g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
Abstract
Palladium-catalyzed, solvent-dependent intramolecular oxypalladation-triggered domino sequences of internal alkynes bearing tethered nucleophilic carboxylic ester and electrophilic enone functionalities were developed for the chemodivergent synthesis of two completely distinct biologically significant...
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Affiliation(s)
- Anish Gupta
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu, 181143, JK, India.
| | - Tanvi Jandial
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu, 181143, JK, India.
| | - Muthu Karuppasamy
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu, 181143, JK, India.
| | - Nattamai Bhuvanesh
- Department of Chemistry, Texas A & M University, College Station, Texas, 77843, USA
| | - Subbiah Nagarajan
- Department of Chemistry, National Institute of Technology, Warangal, Warangal, 506004, Telangana, India
| | - C Uma Maheswari
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur, 613401, Tamil Nadu, India
| | - Vellaisamy Sridharan
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu, 181143, JK, India.
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8
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Karthick KA, Kaleeswari K, Uma Maheswari C, Sivaraman G, Shankar B, Tamilselvi A. Novel pyridoxal based molecular sensor for selective turn–on fluorescent switching functionality towards Zn(II) in live cells. J Photochem Photobiol A Chem 2022. [DOI: 10.1016/j.jphotochem.2022.113861] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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9
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Singh V, Prasad YS, Rachamalla AK, Rebaka VP, Banoo T, Maheswari CU, Sridharan V, Lalitha K, Nagarajan S. Hybrid hydrogels derived from renewable resources as a smart stimuli responsive soft material for drug delivery applications. RSC Adv 2022; 12:2009-2018. [PMID: 35425233 PMCID: PMC8979040 DOI: 10.1039/d1ra08447j] [Citation(s) in RCA: 0] [Impact Index Per Article: 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: 11/18/2021] [Accepted: 12/29/2021] [Indexed: 12/02/2022] Open
Abstract
The design and synthesis of amphiphilic molecules play a crucial role in fabricating smart functional materials via self-assembly. Especially, biologically significant natural molecules and their structural analogues have inspired chemists and made a major contribution to the development of advanced smart materials. In this report, a series of amphiphilic N-acyl amides were synthesized from natural precursors using a simple synthetic protocol. Interestingly, the self-assembly of amphiphiles 6a and 7a furnished a hydrogel and oleogel in vegetable oils. Morphological analysis of gels revealed the existence of a 3-dimensional fibrous network. Thermoresponsive and thixotropic behavior of these gels were evaluated using rheological analysis. A composite gel prepared by the encapsulation of curcumin in the hydrogel formed from 7a displayed a gel–sol transition in response to pH and could act as a dual channel responsive drug carrier. The design and synthesis of amphiphilic molecules play a crucial role in fabricating smart functional materials via self-assembly.![]()
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Affiliation(s)
- Vandana Singh
- School of Chemical and Biotechnology, SASTRA Deemed University Thanjavur-613401 Tamil Nadu India
| | - Yadavali Siva Prasad
- School of Chemical and Biotechnology, SASTRA Deemed University Thanjavur-613401 Tamil Nadu India .,Department of Biomedical Engineering, Saveetha School of Engineering Saveetha Nagar Thandalam Tamil Nadu India
| | - Arun Kumar Rachamalla
- Department of Chemistry, National Institute of Technology Warangal Warangal-506004 Telangana India +91-9940430715
| | - Vara Prasad Rebaka
- Department of Chemistry, National Institute of Technology Warangal Warangal-506004 Telangana India +91-9940430715
| | - Tohira Banoo
- Department of Chemistry, National Institute of Technology Warangal Warangal-506004 Telangana India +91-9940430715
| | - C Uma Maheswari
- School of Chemical and Biotechnology, SASTRA Deemed University Thanjavur-613401 Tamil Nadu India
| | - Vellaisamy Sridharan
- Department of Chemistry and Chemical Sciences, Central University of Jammu Rahya-Suchani (Bagla), District-Samba Jammu-181143 J&K India
| | - Krishnamoorthy Lalitha
- School of Chemical and Biotechnology, SASTRA Deemed University Thanjavur-613401 Tamil Nadu India
| | - Subbiah Nagarajan
- School of Chemical and Biotechnology, SASTRA Deemed University Thanjavur-613401 Tamil Nadu India .,Department of Chemistry, National Institute of Technology Warangal Warangal-506004 Telangana India +91-9940430715
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Pavithra T, Devi ES, Maheswari CU. Recent Advances in N‐Heterocyclic Carbene Catalyzed Oxidative Cyclization for the Formation of Heterocycles. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100289] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- T. Pavithra
- Department of Chemistry, School of Chemical and Biotechnology SASTRA Deemed University Thanjavur 613401 India
| | - E. Sankari Devi
- Department of Chemistry, School of Chemical and Biotechnology SASTRA Deemed University Thanjavur 613401 India
| | - C. Uma Maheswari
- Department of Chemistry, School of Chemical and Biotechnology SASTRA Deemed University Thanjavur 613401 India
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11
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Pavithra T, Devi ES, Nagarajan S, Sridharan V, Maheswari CU. Sulfur Catalyzed Metal‐ and Solvent‐Free ABB'C Four‐Component Synthesis of
N
‐Arylidene‐2‐aryl‐imidazo[1‐2‐
a
]azin‐3‐amines via Strecker Reaction. ChemistrySelect 2021. [DOI: 10.1002/slct.202100682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Thangavel Pavithra
- Department of Chemistry, School of Chemical and Biotechnology SASTRA Deemed University Thanjavur 613401 India
| | - E. Sankari Devi
- Department of Chemistry, School of Chemical and Biotechnology SASTRA Deemed University Thanjavur 613401 India
| | - Subbiah Nagarajan
- Department of Chemistry National Institute of Technology-Warangal Warangal 506004 India
| | - Vellaisamy Sridharan
- Department of Chemistry and Chemical Sciences Central University of Jammu, Rahya-Suchani (Bagla) District-Samba Jammu 181143, J&K India
| | - C. Uma Maheswari
- Department of Chemistry, School of Chemical and Biotechnology SASTRA Deemed University Thanjavur 613401 India
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Thamizhanban A, Balaji S, Lalitha K, Prasad YS, Prasad RV, Kumar RA, Maheswari CU, Sridharan V, Nagarajan S. Glycolipid-Based Oleogels and Organogels: Promising Nanostructured Structuring Agents. J Agric Food Chem 2020; 68:14896-14906. [PMID: 33284625 DOI: 10.1021/acs.jafc.0c02936] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Over the past few decades, the scientific community is actively involved in the development of edible structuring agents suitable for food, cosmetics, agricultural, pharmaceutical, and biotechnology applications. In particular, edible oil structuring using simple amphiphiles would be the best alternative for the currently used trans and saturated fatty acids, which cause deleterious health effects and cardiovascular problems. In this report, we have made an attempt to address the aforementioned consequences, by synthesizing a new class of structuring agents by a judicious combination of δ-gluconolactone and ricinoleic acid, compounds classified as GRAS, using simple steps in good yield. To our delight, the synthesized glycolipids self-assemble in a wide variety of vegetable oils and commercially viable glycerol, ethylene glycol, and polyethylene glycol via various intermolecular interactions to form a gel. The morphology of molecular gels was investigated by optical microscopy and FESEM analysis, which reveal the existence of a tubular architecture with a diameter ranging from 75 to 150 nm. Rheological studies disclosed the viscoelastic nature, thermal processability, and thixotropic behavior of both oleogels and organogels. Altogether, self-assembled oleogel and organogel reported in this paper would potentially be used in food, agricultural, cosmetics, pharmaceutical, and biotechnological applications.
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Affiliation(s)
- Ayyapillai Thamizhanban
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Srikanth Balaji
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Krishnamoorthy Lalitha
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Yadavali Siva Prasad
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - R Vara Prasad
- Department of Chemistry, National Institute of Technology Warangal, Warangal 506004, Telangana, India
| | - R Arun Kumar
- Department of Chemistry, National Institute of Technology Warangal, Warangal 506004, Telangana, India
| | - C Uma Maheswari
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Vellaisamy Sridharan
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu 181143, India
| | - Subbiah Nagarajan
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
- Department of Chemistry, National Institute of Technology Warangal, Warangal 506004, Telangana, India
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13
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Prasad YS, Miryala S, Lalitha K, Saritha B, Maheswari CU, Sridharan V, Srinandan CS, Nagarajan S. An injectable self-healing anesthetic glycolipid-based oleogel with antibiofilm and diabetic wound skin repair properties. Sci Rep 2020; 10:18017. [PMID: 33093507 PMCID: PMC7582191 DOI: 10.1038/s41598-020-73708-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Accepted: 09/22/2020] [Indexed: 12/26/2022] Open
Abstract
Globally, wound infections are considered as one of the major healthcare problems owing to the delayed healing process in diabetic patients and microbial contamination. Thus, the development of advanced materials for wound skin repair is of great research interest. Even though several biomaterials were identified as wound healing agents, gel-based scaffolds derived from either polymer or small molecules have displayed promising wound closure mechanism. Herein, for the first time, we report an injectable and self-healing self-assembled anesthetic oleogel derived from glycolipid, which exhibits antibiofilm and wound closure performance in diabetic rat. Glycolipid derived by the reaction of hydrophobic vinyl ester with α-chloralose in the presence of novozyme 435 undergoes spontaneous self-assembly in paraffin oil furnished an oleogel displaying self-healing behavior. In addition, we have prepared composite gel by encapsulating curcumin in the 3D fibrous network of oleogel. More interestingly, glycolipid in its native form demoed potential in disassembling methicillin-resistant Staphylococcus aureus, methicillin-susceptible Staphylococcus aureus, and Pseudomonas aeruginosa biofilms. Both oleogel and composite gel enhanced the wound skin repair in diabetic induced Wistar rats by promoting collagen synthesis, controlling free radical generation and further regulating tissue remodeling phases. Altogether, the reported supramolecular self-assembled anesthetic glycolipid could be potentially used for diabetic skin wound repair and to treat bacterial biofilm related infections.
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Affiliation(s)
- Yadavali Siva Prasad
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur, Tamil Nadu, 613401, India
| | - Sandeep Miryala
- Biofilm Biology Lab, Centre for Research in Infectious Diseases, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur, Tamil Nadu, 613401, India
| | - Krishnamoorthy Lalitha
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur, Tamil Nadu, 613401, India
| | - Balasubramani Saritha
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur, Tamil Nadu, 613401, India
| | - C Uma Maheswari
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur, Tamil Nadu, 613401, India
| | - Vellaisamy Sridharan
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu, J&K, 181143, India
| | - C S Srinandan
- Biofilm Biology Lab, Centre for Research in Infectious Diseases, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur, Tamil Nadu, 613401, India.
| | - Subbiah Nagarajan
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur, Tamil Nadu, 613401, India.
- Department of Chemistry, National Institute of Technology Warangal, Warangal, Telangana, 506004, India.
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14
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Vachan BS, Karuppasamy M, Jan G, Bhuvanesh N, Maheswari CU, Sridharan V. Direct Access to Bridged Tetrahydroquinolines and Chromanes via an InCl 3-Catalyzed Sequential Three-Component Cascade. J Org Chem 2020; 85:8062-8073. [PMID: 32452689 DOI: 10.1021/acs.joc.0c00893] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
A sequential three-component cascade process was developed for the synthesis of bridged tetrahydroquinolines and chromanes bearing 2,6-methanobenzo[d][1,3]diazocine and 2,6-methanobenzo[g][1,3]oxazocine scaffolds, respectively, in good yields from readily available materials. The InCl3-catalyzed reaction progressed via enamine formation, Michael addition, intramolecular cyclization, and intramolecular iminium ion cyclization steps. Notably, this high atom economic approach (-2H2O) allowed the generation of four new bonds (1 C-C and 3 C-N or 1 C-C, 1 C-O and 2 C-N) and two heterocyclic rings in a single operation.
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Affiliation(s)
- B S Vachan
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Muthu Karuppasamy
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Gowsia Jan
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), Samba, Jammu 181143, Jammu and Kashmir, India
| | - Nattamai Bhuvanesh
- Department of Chemistry, Texas A & M University, College Station, Texas 77843, United States
| | - C Uma Maheswari
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Vellaisamy Sridharan
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India.,Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), Samba, Jammu 181143, Jammu and Kashmir, India
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15
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Karuppasamy M, Vachan BS, Jandial T, Babiola Annes S, Bhuvanesh N, Uma Maheswari C, Sridharan V. Palladium(II)‐Catalyzed Direct Access to Indeno[1,2‐
c
]isochromen‐5(11
H
)‐Ones via Intramolecular Oxypalladation‐Initiated Cascade Process. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000456] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Muthu Karuppasamy
- Department of Chemistry, School of Chemical and BiotechnologySASTRA Deemed University Thanjavur 613401, Tamil Nadu India
| | - B. S. Vachan
- Department of Chemistry, School of Chemical and BiotechnologySASTRA Deemed University Thanjavur 613401, Tamil Nadu India
| | - Tanvi Jandial
- Department of Chemistry and Chemical SciencesCentral University of Jammu, Rahya-Suchani (Bagla), District-Samba Jammu 181143, J&K India
| | - Sesuraj Babiola Annes
- Department of Chemistry, School of Chemical and BiotechnologySASTRA Deemed University Thanjavur 613401, Tamil Nadu India
| | - Nattamai Bhuvanesh
- Department of ChemistryTexas A & M University, College Station Texas 77843 United States
| | - C. Uma Maheswari
- Department of Chemistry, School of Chemical and BiotechnologySASTRA Deemed University Thanjavur 613401, Tamil Nadu India
| | - Vellaisamy Sridharan
- Department of Chemistry, School of Chemical and BiotechnologySASTRA Deemed University Thanjavur 613401, Tamil Nadu India
- Department of Chemistry and Chemical SciencesCentral University of Jammu, Rahya-Suchani (Bagla), District-Samba Jammu 181143, J&K India
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16
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Devi ES, Pavithra T, Tamilselvi A, Nagarajan S, Sridharan V, Maheswari CU. N-Heterocyclic Carbene Catalyzed Synthesis of Trisubstituted Epoxides via Tandem Amidation/Epoxidation Sequence. Org Lett 2020; 22:3576-3580. [PMID: 32271025 DOI: 10.1021/acs.orglett.0c01017] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A tandem amidation/epoxidation sequence between various substituted chalcones and N,N-dimethylformamide (DMF) for the synthesis of trisubstituted epoxides employing N-heterocyclic carbene catalysis was developed. This reaction was performed under metal-free conditions in the presence of tert-butyl hydroperoxide (TBHP) as the oxidant. Trisubstituted epoxides bearing a ketone and an amide functionality (N,N-dimethyl formyl group) were synthesized starting from a wide range of chalcones in moderate to good yields with excellent diastereoselectivity.
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Affiliation(s)
- E Sankari Devi
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, India
| | - Thangavel Pavithra
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, India
| | - A Tamilselvi
- Department of Chemistry, Thiagarajar College, Madurai-625009, India
| | - Subbiah Nagarajan
- Department of Chemistry, National Institute of Technology-Warangal, Warangal-506004, India
| | - Vellaisamy Sridharan
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu-181143, J&K, India
| | - C Uma Maheswari
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, India
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17
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Muthukrishnan I, Karuppasamy M, Vachan BS, Rajput D, Subbiah N, Uma Maheswari C, Sridharan V. Chemodivergent synthesis of functionalized methanodibenzo[b,f][1,5]diazocin-13-ylmethanones and tetrahydroquinolines via solvent-dependent AB2 and A2B2 multicomponent annulation reactions. Org Chem Front 2020. [DOI: 10.1039/d0qo00449a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [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]
Abstract
A solvent-dependent chemodivergent approach was developed for the synthesis of 6,12-methanodibenzo[b,f][1,5]diazocin-13-ylmethanones and 2,3,4-trisubstituted 1,2,3,4-tetrahydroquinolines involving two distinct AB2 and A2B2 multicomponent processes.
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Affiliation(s)
- Isravel Muthukrishnan
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur-613401
- India
| | - Muthu Karuppasamy
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur-613401
- India
| | - B. S. Vachan
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur-613401
- India
| | - Diksha Rajput
- Department of Chemistry and Chemical Sciences
- Central University of Jammu
- Jammu-181143
- India
| | - Nagarajan Subbiah
- Department of Chemistry
- National Institute of Technology
- Warangal-506004
- India
| | - C. Uma Maheswari
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur-613401
- India
| | - Vellaisamy Sridharan
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur-613401
- India
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18
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Karuppasamy M, Vinoth P, Pradeep N, Nagarajan S, Maheswari CU, Sridharan V. Regioselective synthesis of tetrahydroquinolines via syn- and anti-nucleopalladation-initiated cascade processes. Org Biomol Chem 2020; 18:8474-8485. [DOI: 10.1039/d0ob01840f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Regioselective synthesis of tetrahydroquinolines via nucleopalladation-initiated cascade sequences was established.
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Affiliation(s)
- Muthu Karuppasamy
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur-613401
- India
| | - Perumal Vinoth
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur-613401
- India
| | - N. Pradeep
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur-613401
- India
| | - Subbiah Nagarajan
- Department of Chemistry
- National Institute of Technology
- Warangal-506004
- India
| | - C. Uma Maheswari
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur-613401
- India
| | - Vellaisamy Sridharan
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur-613401
- India
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19
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Pavithra T, Devi ES, Nagarajan S, Sridharan V, Maheswari CU. Metal and Solvent-Free Synthesis of 2H-Pyrido[1,2-a]pyrimidin-2-ones Catalyzed by Elemental Sulfur. European J Org Chem 2019. [DOI: 10.1002/ejoc.201901356] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Thangavel Pavithra
- Department of Chemistry; School of Chemical and Biotechnology; SASTRA Deemed University; 613401 Thanjavur India
| | - E. Sankari Devi
- Department of Chemistry; School of Chemical and Biotechnology; SASTRA Deemed University; 613401 Thanjavur India
| | - Subbiah Nagarajan
- Department of Chemistry; National Institute of Technology-Warangal; 506004 Warangal India
| | - Vellaisamy Sridharan
- Department of Chemistry and Chemical Sciences; Central University of Jammu; Rahya-Suchani (Bagla) -181143, J&K District-Samba Jammu India
| | - C. Uma Maheswari
- Department of Chemistry; School of Chemical and Biotechnology; SASTRA Deemed University; 613401 Thanjavur India
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20
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Vachan BS, Ramesh A, Karuppasamy M, Muthukrishnan I, Nagarajan S, Menéndez JC, Maheswari CU, Sridharan V. Oxidant-free, three-component synthesis of 7-amino-6 H-benzo[ c]chromen-6-ones under green conditions. RSC Adv 2019; 9:32946-32953. [PMID: 35529159 PMCID: PMC9073129 DOI: 10.1039/c9ra07108c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Accepted: 10/03/2019] [Indexed: 01/24/2023] Open
Abstract
An oxidant-free three-component synthesis of biologically significant 7-amino-6H-benzo[c]chromen-6-ones was established involving a Sc(OTf)3 catalyzed three-component reaction between primary amines, β-ketoesters and 2-hydroxychalcones under green conditions. In this strategy, both the B and C rings of 6H-benzo[c]chromen-6-ones were constructed simultaneously starting from acyclic precursors by generating four new bonds including two C-C, one C-N and one C-O in a single synthetic operation. The mechanism of this sequential cascade process involves the initial formation of a β-enaminone intermediate followed by Michael addition with 2-hydroxychalcone, intramolecular cyclization, dehydration, lactonization and aromatization steps. Unlike the related literature approaches, this reaction delivered the products without the addition of any external oxidants to achieve the key aromatization step.
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Affiliation(s)
- B S Vachan
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University Thanjavur-613401 Tamil Nadu India
| | - Aishwarya Ramesh
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University Thanjavur-613401 Tamil Nadu India
| | - Muthu Karuppasamy
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University Thanjavur-613401 Tamil Nadu India
| | - Isravel Muthukrishnan
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University Thanjavur-613401 Tamil Nadu India
| | - Subbiah Nagarajan
- Department of Chemistry, National Institute of Technology Warangal Warangal-506004 Telangana India
| | - J Carlos Menéndez
- Unidad de Química Orgánica y Farmacéutica, Departamento de Química en Ciencias Farmacéuticas, Facultad de Farmacia, Universidad Complutense 28040 Madrid Spain
| | - C Uma Maheswari
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University Thanjavur-613401 Tamil Nadu India
| | - Vellaisamy Sridharan
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University Thanjavur-613401 Tamil Nadu India
- Department of Chemistry and Chemical Sciences, Central University of Jammu Rahya-Suchani (Bagla), District-Samba Jammu-181143 J&K India
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21
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Muthukrishnan I, Vachan BS, Karuppasamy M, Eniyaval A, Uma Maheswari C, Nagarajan S, Menéndez JC, Sridharan V. Heterogeneous Amberlyst-15-catalyzed synthesis of complex hybrid heterocycles containing [1,6]-naphthyridine under metal-free green conditions. Org Biomol Chem 2019; 17:6872-6879. [PMID: 31268090 DOI: 10.1039/c9ob01256g] [Citation(s) in RCA: 13] [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: 12/16/2022]
Abstract
An efficient green protocol for the synthesis of complex hybrid heterocycles containing [1,6]-naphthyridine and coumarin/pyrazole moieties was established, involving an intramolecular [4 + 2] hetero Diels-Alder reaction as the key step. The biologically significant 12,13-dihydro-6H-benzo[h]chromeno[3,4-b][1,6]naphthyridin-6-ones and 6,10-dihydro-5H-benzo[h]pyrazolo[3,4-b][1,6]naphthyridines were synthesized starting from 2-(N-propargylamino)-arylaldehydes and 3-aminocoumarins or 3-methyl-1-aryl-1H-pyrazol-5-amines in the presence of an Amberlyst-15 catalyst in PEG-200 in good yields. The easy access to diverse complex molecules in a single operation from readily available starting materials, a commercially available, transition metal-free and recyclable catalyst, the use of a green solvent, a very high atom economy and the release of water as the only side product are the highlights of this protocol.
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Affiliation(s)
- Isravel Muthukrishnan
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, Tamil Nadu, India
| | - B S Vachan
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, Tamil Nadu, India
| | - Muthu Karuppasamy
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, Tamil Nadu, India
| | - A Eniyaval
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, Tamil Nadu, India
| | - C Uma Maheswari
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, Tamil Nadu, India
| | - Subbiah Nagarajan
- Department of Chemistry, National Institute of Technology, Warangal, Warangal-506004, Telangana, India
| | - J Carlos Menéndez
- Unidad de Química Orgańica y Farmacéutica, Departamento de Química en Ciencias Farmacéuticas, Facultad de Farmacia, Universidad Complutense, 28040 Madrid, Spain
| | - Vellaisamy Sridharan
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, Tamil Nadu, India and Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu-181143, J&K, India.
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22
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Karuppasamy M, Vachan BS, Vinoth P, Muthukrishnan I, Nagarajan S, Ielo L, Pace V, Banik S, Maheswari CU, Sridharan V. Direct Access to 9-Chloro-1H-benzo[b]furo[3,4-e]azepin-1-ones via Palladium(II)-Catalyzed Intramolecular syn-Oxypalladation/Olefin Insertion/sp2-C–H Bond Activation Cascade. Org Lett 2019; 21:5784-5788. [DOI: 10.1021/acs.orglett.9b01482] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Muthu Karuppasamy
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - B. S. Vachan
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Perumal Vinoth
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Isravel Muthukrishnan
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Subbiah Nagarajan
- Department of Chemistry, National Institute of Technology, Warangal, Warangal 506004, Telangana, India
| | - Laura Ielo
- Department of Pharmaceutical Chemistry, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria
| | - Vittorio Pace
- Department of Pharmaceutical Chemistry, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria
| | - Subrata Banik
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani
(Bagla), District-Samba, Jammu 181143, India
| | - C. Uma Maheswari
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Vellaisamy Sridharan
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani
(Bagla), District-Samba, Jammu 181143, India
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23
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Vinoth P, Karuppasamy M, Vachan BS, Muthukrishnan I, Maheswari CU, Nagarajan S, Pace V, Roller A, Bhuvanesh N, Sridharan V. Palladium-Catalyzed Regioselective Syn-Chloropalladation-Olefin Insertion-Oxidative Chlorination Cascade: Synthesis of Dichlorinated Tetrahydroquinolines. Org Lett 2019; 21:3465-3469. [PMID: 31001984 DOI: 10.1021/acs.orglett.9b01295] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A palladium catalyzed cascade process involving syn-chloropalladation, intramolecular olefin insertion, and oxidative C-Cl bond formation reactions was demonstrated for the synthesis of dichlorinated tetrahydroquinolines in high yields (up to 93%). The N-propargyl arylamines having a tethered α,β-unsaturated carbonyl moiety underwent a regioselective syn-chloropalladation followed by a Heck-type reaction to deliver the tetrahydroquinoline scaffold. The rare insertion of the second chlorine atom was rationalized comprising a PdII/IV catalytic cycle and oxidative cleavage of the C-PdII bond.
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Affiliation(s)
- Perumal Vinoth
- Department of Chemistry, School of Chemical and Biotechnology , SASTRA Deemed University , Thanjavur - 613401 , Tamil Nadu India
| | - Muthu Karuppasamy
- Department of Chemistry, School of Chemical and Biotechnology , SASTRA Deemed University , Thanjavur - 613401 , Tamil Nadu India
| | - B S Vachan
- Department of Chemistry, School of Chemical and Biotechnology , SASTRA Deemed University , Thanjavur - 613401 , Tamil Nadu India
| | - Isravel Muthukrishnan
- Department of Chemistry, School of Chemical and Biotechnology , SASTRA Deemed University , Thanjavur - 613401 , Tamil Nadu India
| | - C Uma Maheswari
- Department of Chemistry, School of Chemical and Biotechnology , SASTRA Deemed University , Thanjavur - 613401 , Tamil Nadu India
| | - Subbiah Nagarajan
- Department of Chemistry , National Institute of Technology , Warangal, Warangal - 506004 , Telangana , India
| | - Vittorio Pace
- Department of Pharmaceutical Chemistry , University of Vienna , Althanstrasse 14 , A-1090 Vienna , Austria
| | - Alexander Roller
- Department of Pharmaceutical Chemistry , University of Vienna , Althanstrasse 14 , A-1090 Vienna , Austria
| | - Nattamai Bhuvanesh
- Department of Chemistry , Texas A & M University , College Station , Texas 77843 , United States
| | - Vellaisamy Sridharan
- Department of Chemistry, School of Chemical and Biotechnology , SASTRA Deemed University , Thanjavur - 613401 , Tamil Nadu India.,Department of Chemistry and Chemical Sciences , Central University of Jammu , Rahya-Suchani (Bagla), District-Samba, Jammu - 181143 , Jammu and Kashmir , India
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24
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Vivekanand T, Vachan BS, Karuppasamy M, Muthukrishnan I, Maheswari CU, Nagarajan S, Bhuvanesh N, Sridharan V. Diastereoselective ABB' Three-Component Synthesis of Highly Functionalized Spirooxindoles Bearing Five Consecutive Asymmetric Carbons. J Org Chem 2019; 84:4009-4016. [PMID: 30869516 DOI: 10.1021/acs.joc.8b03270] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The synthesis of spirooxindoles bearing tetrahydro-4 H-cyclopenta[ b]furan framework was established starting from isatin-derived aldehydes and 2 equiv of 1,3-dicarbonyl compounds involving a piperidine-catalyzed ABB' three-component domino process. This reaction was highly diastereoselective affording a single diastereomer of spirooxindoles with five consecutive asymmetric carbons including spiro and tetrasubstituted carbon centers. In addition, this waste-free (-2H2O) reaction showed high atom economy and step economy by creating four new bonds, including three C-C bonds and one C-O bond, and two rings (one carbo- and one heterocyclic) in a single operation. The mechanism of this three-component domino process involved sequential Knoevenagel condensation-Michael addition-intramolecular oxa-Michael addition-intramolecular aldol reactions.
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Affiliation(s)
- Thavaraj Vivekanand
- Department of Chemistry, School of Chemical and Biotechnology , SASTRA Deemed University , Thanjavur 613401 , Tamil Nadu , India
| | - B S Vachan
- Department of Chemistry, School of Chemical and Biotechnology , SASTRA Deemed University , Thanjavur 613401 , Tamil Nadu , India
| | - Muthu Karuppasamy
- Department of Chemistry, School of Chemical and Biotechnology , SASTRA Deemed University , Thanjavur 613401 , Tamil Nadu , India
| | - Isravel Muthukrishnan
- Department of Chemistry, School of Chemical and Biotechnology , SASTRA Deemed University , Thanjavur 613401 , Tamil Nadu , India
| | - C Uma Maheswari
- Department of Chemistry, School of Chemical and Biotechnology , SASTRA Deemed University , Thanjavur 613401 , Tamil Nadu , India
| | - Subbiah Nagarajan
- Department of Chemistry , National Institute of Technology , Warangal 506004 , Telangana , India
| | - Nattamai Bhuvanesh
- Department of Chemistry , Texas A & M University , College Station , Texas 77843 , United States
| | - Vellaisamy Sridharan
- Department of Chemistry, School of Chemical and Biotechnology , SASTRA Deemed University , Thanjavur 613401 , Tamil Nadu , India.,Department of Chemistry and Chemical Sciences , Central University of Jammu , Rahya-Suchani (Bagla) , Samba-District, Jammu 181143 , J&K , India
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25
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Thamizhanban A, Lalitha K, Sarvepalli GP, Maheswari CU, Sridharan V, Rayappan JBB, Nagarajan S. Smart supramolecular gels of enolizable amphiphilic glycosylfuran. J Mater Chem B 2019; 7:6238-6246. [DOI: 10.1039/c9tb01480b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
In this report, bio-based amphiphilic glycosylfurans were synthesized using a biocatalyst. For the first time, we are reporting on hydrogelation via in situ molecular tuning of amphiphilic glycosylfurans followed by a self-sorting mechanism.
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Affiliation(s)
- Ayyapillai Thamizhanban
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur – 613401
- India
| | - Krishnamoorthy Lalitha
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur – 613401
- India
| | - Guru Prasanth Sarvepalli
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur – 613401
- India
| | - C. Uma Maheswari
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur – 613401
- India
| | - Vellaisamy Sridharan
- Department of Chemistry and Chemical Sciences
- Central University of Jammu
- Rahya-Suchani (Bagla)
- Jammu – 181143
- India
| | | | - Subbiah Nagarajan
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur – 613401
- India
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Muthusamy K, Lalitha K, Prasad YS, Thamizhanban A, Sridharan V, Maheswari CU, Nagarajan S. Lipase-Catalyzed Synthesis of Furan-Based Oligoesters and their Self-Assembly-Assisted Polymerization. ChemSusChem 2018; 11:2453-2463. [PMID: 29750850 DOI: 10.1002/cssc.201800446] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Indexed: 06/08/2023]
Abstract
We investigate the synthesis of bio-based hydrophilic and hydrophobic oligoesters, which in turn are derived from easily accessible monomers from natural resources. In addition to the selection of renewable monomers, Novozyme 435, an immobilized lipase B from Candida antarctica was used for the oligomerization of monomers. The reaction conditions for oligomerization using Novozyme 435 were established to obtain a moderate-to-good yield. The average number of repeating units and the molecular weight distribution of hydrophilic and hydrophobic oligoester were identified by using NMR spectroscopy, gel-permeation chromatography, and MS. The oligoester derived from a hydrophilic monomer self-assembled to form a viscous solution, which upon further heating resulted in the formation of a polymer by the intermolecular Diels-Alder reaction. The viscosity of the solution and the assembly of oligoester to form a fibrous structure were investigated by using rheological studies, XRD, and SEM. The molecular weight of the cross-linked polymer was identified by using matrix-assisted laser desorption/ionization-MS. The thermal properties of the bio-based polymers were investigated by using thermogravimetric analysis and differential scanning calorimetry. For the first time, the self-assembly-assisted polymerization of an oligoester is reported using the intermolecular Diels-Alder reaction, which opens a new avenue in the field of polymer science.
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Affiliation(s)
- Kumarasamy Muthusamy
- Organic Synthesis Group, Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-, 613401, India
| | - Krishnamoorthy Lalitha
- Organic Synthesis Group, Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-, 613401, India
| | - Yadavali Siva Prasad
- Organic Synthesis Group, Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-, 613401, India
| | - Ayyapillai Thamizhanban
- Organic Synthesis Group, Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-, 613401, India
| | - Vellaisamy Sridharan
- Organic Synthesis Group, Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-, 613401, India
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu-, 181143, Jammu and Kashmir, India
| | - C Uma Maheswari
- Organic Synthesis Group, Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-, 613401, India
| | - Subbiah Nagarajan
- Organic Synthesis Group, Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-, 613401, India
- Department of Chemistry, National Institute of Technology, Warangal, Warangal-, 506004, Telangana, India
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Reddy KO, Maheswari CU, Dhlamini M, Mothudi B, Kommula V, Zhang J, Zhang J, Rajulu AV. Extraction and characterization of cellulose single fibers from native african napier grass. Carbohydr Polym 2018. [DOI: 10.1016/j.carbpol.2018.01.110] [Citation(s) in RCA: 95] [Impact Index Per Article: 15.8] [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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Lalitha K, Sridharan V, Maheswari CU, Vemula PK, Nagarajan S. Morphology transition in helical tubules of a supramolecular gel driven by metal ions. Chem Commun (Camb) 2018; 53:1538-1541. [PMID: 28094356 DOI: 10.1039/c6cc09120b] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Our aim to access a particular chemical functionality on helical tubules has been achieved by the rational molecular design and synthesis of glucono-appended cardanol derivatives. For the first time, we report a chiral molecular packing with α-helical tubules, and chiral symmetry-breaking upon exposure to Cu2+ that generated the final ordered structure via an in situ morphological transition without undergoing any phase change.
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Affiliation(s)
- Krishnamoorthy Lalitha
- Organic Synthesis Group, Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials, School of Chemical and Biotechnology, SASTRA University, Thanjavur-613401, Tamil Nadu, India.
| | - Vellaisamy Sridharan
- Organic Synthesis Group, Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials, School of Chemical and Biotechnology, SASTRA University, Thanjavur-613401, Tamil Nadu, India.
| | - C Uma Maheswari
- Organic Synthesis Group, Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials, School of Chemical and Biotechnology, SASTRA University, Thanjavur-613401, Tamil Nadu, India.
| | - Praveen Kumar Vemula
- Laboratory of Self-Assembled Biomaterials, Institute for Stem Cell Biology and Regenerative Medicine (inStem), National Centre for Biological Sciences (NCBS), Bangalore-560 065, Karnataka, India
| | - Subbiah Nagarajan
- Organic Synthesis Group, Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials, School of Chemical and Biotechnology, SASTRA University, Thanjavur-613401, Tamil Nadu, India.
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Prasad YS, Saritha B, Tamizhanban A, Lalitha K, Kabilan S, Maheswari CU, Sridharan V, Nagarajan S. Enzymatic synthesis and self-assembly of glycolipids: robust self-healing and wound closure performance of assembled soft materials. RSC Adv 2018; 8:37136-37145. [PMID: 35557831 PMCID: PMC9089313 DOI: 10.1039/c8ra07703g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [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: 09/16/2018] [Accepted: 10/22/2018] [Indexed: 11/21/2022] Open
Abstract
In developing countries, wounds are a major health concern and pose a significant problem. Hence, the development of new materials that can act as scaffolds for in situ tissue regeneration and regrowth is necessary. In this report, we present a new class of injectable oleogel and composite gel derived from glycolipids that provide reversible interlinked 3D fiberous network architecture for effective wound closure by tissue regrowth and regeneration. Glycolipids were derived from α-chloralose and various vinyl esters using Novozyme 435, an immobilized lipase B from Candida antarctica as a catalyst, in good yield. These glycolipids undergo spontaneous self-assembly in paraffin oil to form an oleogel, in which curcumin was successfully incorporated to generate a composite gel. Morphological analysis of the oleogel and composite gel clearly revealed the formation of a 3D fiberous network. Rheological investigation revealed the thermal and mechanical processability of the oleogel and composite gel under various experimental conditions. Interestingly, the developed injectable oleogel and composite gel are able to accelerate the wound healing process by regulating the overlapping phases of inflammation, cell proliferation and extracellular matrix remodelling. Since chloralose displays anesthetic properties, this study will establish a new strategy to develop anesthetic wound healing oleogels in the future. In this report, we present a new class of injectable oleogels and a composite gel derived from glycolipids that provide a reversible interlinked 3D fiberous network architecture for effective wound closure by tissue regrowth and regeneration.![]()
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Affiliation(s)
- Yadavali Siva Prasad
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur – 613401
- India
| | - Balasubramani Saritha
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur – 613401
- India
| | - Ayyapillai Tamizhanban
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur – 613401
- India
| | - Krishnamoorthy Lalitha
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur – 613401
- India
| | - Sakthivel Kabilan
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur – 613401
- India
| | - C. Uma Maheswari
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur – 613401
- India
| | - Vellaisamy Sridharan
- Department of Chemistry and Chemical Sciences
- Central University of Jammu
- Rahya-Suchani (Bagla)
- Jammu-181143
- India
| | - Subbiah Nagarajan
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur – 613401
- India
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Lalitha K, Gayathri K, Prasad YS, Saritha R, Thamizhanban A, Maheswari CU, Sridharan V, Nagarajan S. Supramolecular Gel Formation Based on Glycolipids Derived from Renewable Resources. Gels 2017; 4:E1. [PMID: 30674777 PMCID: PMC6318777 DOI: 10.3390/gels4010001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Revised: 12/21/2017] [Accepted: 12/22/2017] [Indexed: 12/25/2022] Open
Abstract
The potential applications of self-assembled supramolecular gels based on natural molecules encouraged the researchers to develop a versatile synthetic method for their structural analogues. Herein, we report a facile synthesis of glycolipid from renewable resources, cashew nut shell liquid,d and d-glucose in good yield. Gelation behavior of these glycolipids were studied in a wide range of solvents and oils. To our delight, compound 5b formed a hydrogel with Critical gelator concentration (CGC) of 0.29% w/v. Morphological analysis of the hydrogel depicts the formation of twisted fibers with an entangled network. Formation of a twisted fibrous structure was further identified by CD spectral studies with respect to temperature. The molecular self-assembly assisted by hydrogen bonding, hydrophobic, and π⁻π stacking interactions were identified by X-ray diffraction (XRD) and FTIR studies. Rheological analysis depicted the mechanical strength and stability of the hydrogel, which is crucial in predicting the practical applications of supramolecular soft materials.
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Affiliation(s)
- Krishnamoorthy Lalitha
- Organic Synthesis Group, Department of Chemistry and CeNTAB, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, Tamil Nadu, India.
| | - Kandasamy Gayathri
- Organic Synthesis Group, Department of Chemistry and CeNTAB, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, Tamil Nadu, India.
| | - Yadavali Siva Prasad
- Organic Synthesis Group, Department of Chemistry and CeNTAB, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, Tamil Nadu, India.
| | - Rajendhiran Saritha
- Organic Synthesis Group, Department of Chemistry and CeNTAB, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, Tamil Nadu, India.
| | - A Thamizhanban
- Organic Synthesis Group, Department of Chemistry and CeNTAB, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, Tamil Nadu, India.
| | - C Uma Maheswari
- Organic Synthesis Group, Department of Chemistry and CeNTAB, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, Tamil Nadu, India.
| | - Vellaisamy Sridharan
- Organic Synthesis Group, Department of Chemistry and CeNTAB, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, Tamil Nadu, India.
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu-181143, Jammu and Kashmir, India.
| | - Subbiah Nagarajan
- Organic Synthesis Group, Department of Chemistry and CeNTAB, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, Tamil Nadu, India.
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Prasad YS, Miryala S, Lalitha K, Ranjitha K, Barbhaiwala S, Sridharan V, Maheswari CU, Srinandan CS, Nagarajan S. Disassembly of Bacterial Biofilms by the Self-Assembled Glycolipids Derived from Renewable Resources. ACS Appl Mater Interfaces 2017; 9:40047-40058. [PMID: 29096062 DOI: 10.1021/acsami.7b12225] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
More than 80% of chronic infections of bacteria are caused by biofilms. It is also a long-term survival strategy of the pathogens in a nonhost environment. Several amphiphilic molecules have been used in the past to potentially disrupt biofilms; however, the involvement of multistep synthesis, complicated purification and poor yield still remains a major problem. Herein, we report a facile synthesis of glycolipid based surfactant from renewable feedstocks in good yield. The nature of carbohydrate unit present in glycolipid influence the ring chain tautomerism, which resulted in the existence of either cyclic structure or both cyclic and acyclic structures. Interestingly, these glycolipids self-assemble into gel in highly hydrophobic solvents and vegetable oils, and displayed foam formation in water. The potential application of these self-assembled glycolipids to disrupt preformed biofilm was examined against various pathogens. It was observed that glycolipid 6a disrupts Staphylococcus aureus and Listeria monocytogenes biofilm, while the compound 6c was effective in disassembling uropathogenic E. coli and Salmonella enterica Typhimurium biofilms. Altogether, the supramolecular self-assembled materials, either as gel or as surfactant solution could be potentially used for surface cleansing in hospital environments or the food processing industries to effectively reduce pathogenic biofilms.
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Affiliation(s)
- Yadavali Siva Prasad
- Organic Synthesis Group, Department of Chemistry and CeNTAB, School of Chemical and Biotechnology, SASTRA University , Thanjavur-613401, Tamil Nadu, India
| | - Sandeep Miryala
- Biofilm Biology Lab, Centre for Research in Infectious Diseases, School of Chemical and Biotechnology, SASTRA University , Thanjavur-613401, Tamil Nadu, India
| | - Krishnamoorthy Lalitha
- Organic Synthesis Group, Department of Chemistry and CeNTAB, School of Chemical and Biotechnology, SASTRA University , Thanjavur-613401, Tamil Nadu, India
| | - K Ranjitha
- Organic Synthesis Group, Department of Chemistry and CeNTAB, School of Chemical and Biotechnology, SASTRA University , Thanjavur-613401, Tamil Nadu, India
| | - Shehnaz Barbhaiwala
- Biofilm Biology Lab, Centre for Research in Infectious Diseases, School of Chemical and Biotechnology, SASTRA University , Thanjavur-613401, Tamil Nadu, India
| | - Vellaisamy Sridharan
- Organic Synthesis Group, Department of Chemistry and CeNTAB, School of Chemical and Biotechnology, SASTRA University , Thanjavur-613401, Tamil Nadu, India
| | - C Uma Maheswari
- Organic Synthesis Group, Department of Chemistry and CeNTAB, School of Chemical and Biotechnology, SASTRA University , Thanjavur-613401, Tamil Nadu, India
| | - C S Srinandan
- Biofilm Biology Lab, Centre for Research in Infectious Diseases, School of Chemical and Biotechnology, SASTRA University , Thanjavur-613401, Tamil Nadu, India
| | - Subbiah Nagarajan
- Organic Synthesis Group, Department of Chemistry and CeNTAB, School of Chemical and Biotechnology, SASTRA University , Thanjavur-613401, Tamil Nadu, India
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Uma Maheswari C, Obi Reddy K, Dhlamini MS, Mothudi BM, Kommula VP, Rajulu AV. Extraction and structural characterization of cellulose from milkweed floss. SEP SCI TECHNOL 2017. [DOI: 10.1080/01496395.2017.1374406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- C. Uma Maheswari
- Department of Chemical Engineering Technology, Doornfontein Campus, University of Johannesburg, Johannesburg, South Africa
| | - K. Obi Reddy
- Department of Physics, College of Science, Engineering and Technology, University of South Africa, Johannesburg, Florida, South Africa
| | - M. S Dhlamini
- Department of Physics, College of Science, Engineering and Technology, University of South Africa, Johannesburg, Florida, South Africa
| | - B. M Mothudi
- Department of Physics, College of Science, Engineering and Technology, University of South Africa, Johannesburg, Florida, South Africa
| | - V. P Kommula
- Department of Mechanical Engineering, Faculty of Engineering and Technology, University of Botswana, Gaborone, Botswana
| | - A. Varada Rajulu
- Centre for Composite Materials, International Research Centre, Kalasalingam University, Anand Nagar, Krishnan Koil, India
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Alanthadka A, Devi ES, Selvi AT, Nagarajan S, Sridharan V, Maheswari CU. N-Heterocyclic Carbene-Catalyzed Mannich Reaction for the Synthesis of β-Amino Ketones: N
,N
-Dimethylformamide as Carbon Source. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700125] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Anitha Alanthadka
- Organic Synthesis Group, Department of Chemistry; School of Chemical and Biotechnology; SASTRA University; Thanjavur 613401 India
| | - E. Sankari Devi
- Organic Synthesis Group, Department of Chemistry; School of Chemical and Biotechnology; SASTRA University; Thanjavur 613401 India
| | - A. Tamil Selvi
- Department of Chemistry; Thiagarajar College; Madurai 625009 India
| | - Subbiah Nagarajan
- Organic Synthesis Group, Department of Chemistry; School of Chemical and Biotechnology; SASTRA University; Thanjavur 613401 India
| | - Vellaisamy Sridharan
- Organic Synthesis Group, Department of Chemistry; School of Chemical and Biotechnology; SASTRA University; Thanjavur 613401 India
| | - C. Uma Maheswari
- Organic Synthesis Group, Department of Chemistry; School of Chemical and Biotechnology; SASTRA University; Thanjavur 613401 India
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34
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Reddy KO, Maheswari CU, Dhlamini M, Mothudi B, Zhang J, Zhang J, Nagarajan R, Rajulu AV. Preparation and characterization of regenerated cellulose films using borassus fruit fibers and an ionic liquid. Carbohydr Polym 2017; 160:203-211. [DOI: 10.1016/j.carbpol.2016.12.051] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2016] [Revised: 12/10/2016] [Accepted: 12/20/2016] [Indexed: 10/20/2022]
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35
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Muthukrishnan I, Karuppasamy M, Nagarajan S, Maheswari CU, Pace V, Menéndez JC, Sridharan V. Synthesis of 6,12-Epiminodibenzo[b,f][1,5]diazocines via an Ytterbium Triflate-Catalyzed, AB 2 Three-Component Reaction. J Org Chem 2016; 81:9687-9694. [PMID: 27682636 DOI: 10.1021/acs.joc.6b01764] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
An efficient and selective procedure for the synthesis of epiminodibenzo[b,f][1,5]diazocines involving a AB2 three-component reaction is developed. Two equivalents of suitably substituted 2-aminoarylaldehydes reacted with arylamines in the presence of Yb(OTf)3 to afford the desired products in high yields. The reaction is highly atom-economic and waste-free, in addition to allowing the generation of two heterocyclic rings and four C-N bonds in a single operation. Significantly, this approach is complementary to the existing literature procedures, affording arylamine-derived products that could not be accessed previously. A plausible mechanism is proposed involving an imine formation-intermolecular annulation-intramolecular iminium ion cyclization sequence.
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Affiliation(s)
- Isravel Muthukrishnan
- Organic Synthesis Group, Department of Chemistry, School of Chemical and Biotechnology, SASTRA University , Thanjavur, Tamil Nadu 613401, India
| | - Muthu Karuppasamy
- Organic Synthesis Group, Department of Chemistry, School of Chemical and Biotechnology, SASTRA University , Thanjavur, Tamil Nadu 613401, India
| | - Subbiah Nagarajan
- Organic Synthesis Group, Department of Chemistry, School of Chemical and Biotechnology, SASTRA University , Thanjavur, Tamil Nadu 613401, India
| | - C Uma Maheswari
- Organic Synthesis Group, Department of Chemistry, School of Chemical and Biotechnology, SASTRA University , Thanjavur, Tamil Nadu 613401, India
| | - Vittorio Pace
- Department of Pharmaceutical Chemistry, University of Vienna , Althanstrasse 14, A-1090 Vienna, Austria
| | - J Carlos Menéndez
- Departamento de Química Orgánica y Farmacéutica, Facultad de Farmacia, Universidad Complutense , 28040 Madrid, Spain
| | - Vellaisamy Sridharan
- Organic Synthesis Group, Department of Chemistry, School of Chemical and Biotechnology, SASTRA University , Thanjavur, Tamil Nadu 613401, India
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36
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Alanthadka A, Devi ES, Nagarajan S, Sridharan V, Suvitha A, Maheswari CU. NHC-Catalyzed Benzylic Csp³-H Bond Activation of Alkylarenes andN-Benzylamines for the Synthesis of 3H-Quinazolin-4-ones: Experimental and Theoretical Study. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600792] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Anitha Alanthadka
- Organic Synthesis Group; Department of Chemistry; School of Chemical and Biotechnology; SASTRA University; 613401 Thanjavur India
| | - E. Sankari Devi
- Organic Synthesis Group; Department of Chemistry; School of Chemical and Biotechnology; SASTRA University; 613401 Thanjavur India
| | - Subbiah Nagarajan
- Organic Synthesis Group; Department of Chemistry; School of Chemical and Biotechnology; SASTRA University; 613401 Thanjavur India
| | - Vellaisamy Sridharan
- Organic Synthesis Group; Department of Chemistry; School of Chemical and Biotechnology; SASTRA University; 613401 Thanjavur India
| | - Ambigapathy Suvitha
- Computational Molecular Biophysics Laboratory; Department of Chemistry; School of Chemical and Biotechnology; SASTRA University; 613401 Thanjavur India
| | - C. Uma Maheswari
- Organic Synthesis Group; Department of Chemistry; School of Chemical and Biotechnology; SASTRA University; 613401 Thanjavur India
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37
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Vinoth P, Nagarajan S, Maheswari CU, Sudalai A, Pace V, Sridharan V. Palladium-Catalyzed Internal Nucleophile-Assisted Hydration–Olefin Insertion Cascade: Diastereoselective Synthesis of 2,3-Dihydro-1H-inden-1-ones. Org Lett 2016; 18:3442-5. [DOI: 10.1021/acs.orglett.6b01623] [Citation(s) in RCA: 21] [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: 11/29/2022]
Affiliation(s)
- Perumal Vinoth
- Organic
Synthesis Group, Department of Chemistry, School of Chemical and Biotechnology, SASTRA University, Thanjavur 613 401, Tamil
Nadu, India
| | - Subbiah Nagarajan
- Organic
Synthesis Group, Department of Chemistry, School of Chemical and Biotechnology, SASTRA University, Thanjavur 613 401, Tamil
Nadu, India
| | - C. Uma Maheswari
- Organic
Synthesis Group, Department of Chemistry, School of Chemical and Biotechnology, SASTRA University, Thanjavur 613 401, Tamil
Nadu, India
| | - Arumugam Sudalai
- Chemical
Engineering and Process Development Division, National Chemical Laboratory, Pashan Road, Pune 411
008, India
| | - Vittorio Pace
- Department
of Pharmaceutical Chemistry, University of Vienna, Althanstrasse
14, A-1090 Vienna, Austria
| | - Vellaisamy Sridharan
- Organic
Synthesis Group, Department of Chemistry, School of Chemical and Biotechnology, SASTRA University, Thanjavur 613 401, Tamil
Nadu, India
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38
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Kaur G, Balamurugan P, Uma Maheswari C, Anitha A, Princy SA. Combinatorial Effects of Aromatic 1,3-Disubstituted Ureas and Fluoride on In vitro Inhibition of Streptococcus mutans Biofilm Formation. Front Microbiol 2016; 7:861. [PMID: 27375583 PMCID: PMC4893485 DOI: 10.3389/fmicb.2016.00861] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [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: 01/13/2016] [Accepted: 05/23/2016] [Indexed: 01/11/2023] Open
Abstract
Dental caries occur as a result of disequilibrium between acid producing pathogenic bacteria and alkali generating commensal bacteria within a dental biofilm (dental plaque). Streptococcus mutans has been reported as a primary cariogenic pathogen associated with dental caries. Emergence of multidrug resistant as well as fluoride resistant strains of S. mutans due to over use of various antibiotics are a rising problem and prompted the researchers worldwide to search for alternative therapies. In this perspective, the present study was aimed to screen selective inhibitors against ComA, a bacteriocin associated ABC transporter, involved in the quorum sensing of S. mutans. In light of our present in silico findings, 1,3-disubstituted urea derivatives which had better affinity to ComA were chemically synthesized in the present study for in vitro evaluation of S. mutans biofilm inhibition. The results revealed that 1,3-disubstituted urea derivatives showed good biofilm inhibition. In addition, synthesized compounds exhibited potent synergy with a very low concentration of fluoride (31.25-62.5 ppm) in inhibiting the biofilm formation of S. mutans without affecting the bacterial growth. Further, the results were supported by confocal laser scanning microscopy. On the whole, from our experimental results we conclude that the combinatorial application of fluoride and disubstituted ureas has a potential synergistic effect which has a promising approach in combating multidrug resistant and fluoride resistant S. mutans in dental caries management.
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Affiliation(s)
- Gurmeet Kaur
- Quorum Sensing Laboratory, Centre for Research in Infectious Diseases, School of Chemical and Biotechnology, SASTRA UniversityThanjavur, India
| | - P. Balamurugan
- Quorum Sensing Laboratory, Centre for Research in Infectious Diseases, School of Chemical and Biotechnology, SASTRA UniversityThanjavur, India
| | - C. Uma Maheswari
- Organic Synthesis Group, Department of Chemistry, School of Chemical and Biotechnology, SASTRA UniversityThanjavur, India
| | - A. Anitha
- Organic Synthesis Group, Department of Chemistry, School of Chemical and Biotechnology, SASTRA UniversityThanjavur, India
| | - S. Adline Princy
- Quorum Sensing Laboratory, Centre for Research in Infectious Diseases, School of Chemical and Biotechnology, SASTRA UniversityThanjavur, India
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39
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Reddy KO, Maheswari CU, Dhlamini MS, Kommula VP. Exploration on the characteristics of cellulose microfibers from Palmyra palm fruits. International Journal of Polymer Analysis and Characterization 2016. [DOI: 10.1080/1023666x.2016.1147799] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Sankari Devi E, Alanthadka A, Tamilselvi A, Nagarajan S, Sridharan V, Maheswari CU. Metal-free oxidative amidation of aldehydes with aminopyridines employing aqueous hydrogen peroxide. Org Biomol Chem 2016; 14:8228-31. [DOI: 10.1039/c6ob01454b] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [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]
Abstract
An elegant metal free method for the amidation of aldehydes with aminopyridines for the synthesis of N-(pyridinyl)benzamide was accomplished using simple aqueous H2O2 as the oxidant.
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Affiliation(s)
- E. Sankari Devi
- Organic Synthesis Group
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA University
- Thanjavur-613401
| | - Anitha Alanthadka
- Organic Synthesis Group
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA University
- Thanjavur-613401
| | - A. Tamilselvi
- Department of Chemistry
- Thiagarajar College
- Madurai-625009
- India
| | - Subbiah Nagarajan
- Organic Synthesis Group
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA University
- Thanjavur-613401
| | - Vellaisamy Sridharan
- Organic Synthesis Group
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA University
- Thanjavur-613401
| | - C. Uma Maheswari
- Organic Synthesis Group
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA University
- Thanjavur-613401
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Muthukrishnan I, Vinoth P, Vivekanand T, Nagarajan S, Maheswari CU, Menéndez JC, Sridharan V. Synthesis of 5,6-Dihydrodibenzo[b,h][1,6]naphthyridines via Copper Bromide Catalyzed Intramolecular [4 + 2] Hetero-Diels–Alder Reactions. J Org Chem 2015; 81:1116-24. [DOI: 10.1021/acs.joc.5b02669] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Isravel Muthukrishnan
- Organic
Synthesis Group, Department of Chemistry, School of Chemical and Biotechnology, SASTRA University, Thanjavur 613401, Tamil
Nadu, India
| | - Perumal Vinoth
- Organic
Synthesis Group, Department of Chemistry, School of Chemical and Biotechnology, SASTRA University, Thanjavur 613401, Tamil
Nadu, India
| | - Thavaraj Vivekanand
- Organic
Synthesis Group, Department of Chemistry, School of Chemical and Biotechnology, SASTRA University, Thanjavur 613401, Tamil
Nadu, India
| | - Subbiah Nagarajan
- Organic
Synthesis Group, Department of Chemistry, School of Chemical and Biotechnology, SASTRA University, Thanjavur 613401, Tamil
Nadu, India
| | - C. Uma Maheswari
- Organic
Synthesis Group, Department of Chemistry, School of Chemical and Biotechnology, SASTRA University, Thanjavur 613401, Tamil
Nadu, India
| | - J. Carlos Menéndez
- Departamento
de Química Orgánica y Farmacéutica, Facultad
de Farmacia, Universidad Complutense, 28040 Madrid, Spain
| | - Vellaisamy Sridharan
- Organic
Synthesis Group, Department of Chemistry, School of Chemical and Biotechnology, SASTRA University, Thanjavur 613401, Tamil
Nadu, India
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Vivekanand T, Sandhya T, Vinoth P, Nagarajan S, Maheswari CU, Sridharan V. N-(2-Aminobenzylidene)-4-methylanilines—stable and cheap alternate for 2-aminobenzaldehydes: concise synthesis of 3-unsubstituted-2-aroylindoles. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.07.073] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Reddy KO, Maheswari CU, Reddy KR, Shukla M, Muzenda E, Rajulu AV. Effect of Chemical Treatment and Fiber Loading on Mechanical Properties ofBorassus(Toddy Palm) Fiber/Epoxy Composites. International Journal of Polymer Analysis and Characterization 2015. [DOI: 10.1080/1023666x.2015.1054084] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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45
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Xia G, Reddy KO, Maheswari CU, Jayaramudu J, Zhang J, Zhang J, Rajulu AV. Preparation and Properties of Biodegradable Spent Tea Leaf Powder/Poly(Propylene Carbonate) Composite Films. International Journal of Polymer Analysis and Characterization 2015. [DOI: 10.1080/1023666x.2015.1019257] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Lalitha K, Prasad YS, Maheswari CU, Sridharan V, John G, Nagarajan S. Stimuli responsive hydrogels derived from a renewable resource: synthesis, self-assembly in water and application in drug delivery. J Mater Chem B 2015; 3:5560-5568. [DOI: 10.1039/c5tb00864f] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [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]
Abstract
We report coumarin-tris based hydrogel and curcumin encapsulated composite gel for stimuli responsive drug delivery applications.
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Affiliation(s)
- Krishnamoorthy Lalitha
- Organic Synthesis Group
- Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials
- School of Chemical and Biotechnology
- SASTRA University
- Thanjavur – 613401
| | - Y. Siva Prasad
- Organic Synthesis Group
- Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials
- School of Chemical and Biotechnology
- SASTRA University
- Thanjavur – 613401
| | - C. Uma Maheswari
- Organic Synthesis Group
- Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials
- School of Chemical and Biotechnology
- SASTRA University
- Thanjavur – 613401
| | - Vellaisamy Sridharan
- Organic Synthesis Group
- Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials
- School of Chemical and Biotechnology
- SASTRA University
- Thanjavur – 613401
| | - George John
- Department of Chemistry
- the City College of New York
- New York
- USA
| | - Subbiah Nagarajan
- Organic Synthesis Group
- Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials
- School of Chemical and Biotechnology
- SASTRA University
- Thanjavur – 613401
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Lalitha K, Prasad YS, Sridharan V, Maheswari CU, John G, Nagarajan S. A renewable resource-derived thixotropic self-assembled supramolecular gel: magnetic stimuli responsive and real-time self-healing behaviour. RSC Adv 2015. [DOI: 10.1039/c5ra14744a] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [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 fluorescent, self-healing and magnetic responsive molecular gel was developed from a renewable resource.
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Affiliation(s)
- Krishnamoorthy Lalitha
- Organic Synthesis Group
- Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials
- School of Chemical and Biotechnology
- SASTRA University
- Thanjavur - 613401
| | - Y. Siva Prasad
- Organic Synthesis Group
- Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials
- School of Chemical and Biotechnology
- SASTRA University
- Thanjavur - 613401
| | - Vellaisamy Sridharan
- Organic Synthesis Group
- Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials
- School of Chemical and Biotechnology
- SASTRA University
- Thanjavur - 613401
| | - C. Uma Maheswari
- Organic Synthesis Group
- Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials
- School of Chemical and Biotechnology
- SASTRA University
- Thanjavur - 613401
| | - George John
- Department of Chemistry
- The City College of New York
- New York
- USA
| | - Subbiah Nagarajan
- Organic Synthesis Group
- Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials
- School of Chemical and Biotechnology
- SASTRA University
- Thanjavur - 613401
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Vinoth P, Prasad PSR, Vivekanand T, Maheswari CU, Nagarajan S, Menéndez JC, Sridharan V. Expedient, catalyst-free, three-component synthesis of fused tetrahydropyridines in water. RSC Adv 2015. [DOI: 10.1039/c5ra18804k] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [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
An expedient, three-component synthesis of oxazolo[3,2-a]pyridines and pyrido[2,1-b][1,3]oxazines was achieved under catalyst-free conditions in water.
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Affiliation(s)
- Perumal Vinoth
- Organic Synthesis Group
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA University
- Thanjavur 613401
| | - P. S. Ram Prasad
- Organic Synthesis Group
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA University
- Thanjavur 613401
| | - Thavaraj Vivekanand
- Organic Synthesis Group
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA University
- Thanjavur 613401
| | - C. Uma Maheswari
- Organic Synthesis Group
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA University
- Thanjavur 613401
| | - Subbiah Nagarajan
- Organic Synthesis Group
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA University
- Thanjavur 613401
| | - J. Carlos Menéndez
- Departamento de Química Orgánica y Farmacéutica
- Facultad de Farmacia
- Universidad Complutense
- 28040 Madrid
- Spain
| | - Vellaisamy Sridharan
- Organic Synthesis Group
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA University
- Thanjavur 613401
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50
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Obi Reddy K, Uma Maheswari C, Shukla M, Muzenda E. Preparation, Chemical Composition, Characterization, and Properties of Napier Grass Paper Sheets. SEP SCI TECHNOL 2014. [DOI: 10.1080/01496395.2014.893358] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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