1
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Mills LR, Di Mare F, Gygi D, Lee H, Simmons EM, Kim J, Wisniewski SR, Chirik PJ. Phenoxythiazoline (FTz)-Cobalt(II) Precatalysts Enable C(sp 2 )-C(sp 3 ) Bond-Formation for Key Intermediates in the Synthesis of Toll-like Receptor 7/8 Antagonists. Angew Chem Int Ed Engl 2023:e202313848. [PMID: 37917119 DOI: 10.1002/anie.202313848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Revised: 11/01/2023] [Accepted: 11/02/2023] [Indexed: 11/03/2023]
Abstract
Evaluation of the relative rates of the cobalt-catalyzed C(sp2 )-C(sp3 ) Suzuki-Miyaura cross-coupling between the neopentylglycol ester of 4-fluorophenylboronic acid and N-Boc-4-bromopiperidine established that smaller N-alkyl substituents on the phenoxyimine (FI) supporting ligand accelerated the overall rate of the reaction. This trend inspired the design of optimal cobalt catalysts with phenoxyoxazoline (FOx) and phenoxythiazoline (FTz) ligands. An air-stable cobalt(II) precatalyst, (FTz)CoBr(py)3 was synthesized and applied to the cross-coupling of an indole-5-boronic ester nucleophile with a piperidine-4-bromide electrophile that is relevant to the synthesis of reported toll-like receptor (TLR) 7/8 antagonist molecules including afimetoran. Addition of excess KOMe⋅B(Oi Pr)3 improved catalyst lifetime due to attenuation of alkoxide basicity that otherwise resulted in demetallation of the FI chelate. A first-order dependence on the cobalt precatalyst and a saturation regime in nucleophile were observed, supporting turnover-limiting transmetalation and the origin of the observed trends in N-imine substitution.
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Affiliation(s)
- L Reginald Mills
- Department of Chemistry, Princeton University, Princeton, NJ 08544, USA
| | - Francesca Di Mare
- Department of Chemistry, Princeton University, Princeton, NJ 08544, USA
| | - David Gygi
- Chemical Process Development, Bristol Myers Squibb Company, New Brunswick, NJ 08903, USA
| | - Heejun Lee
- Chemical Process Development, Bristol Myers Squibb Company, New Brunswick, NJ 08903, USA
| | - Eric M Simmons
- Chemical Process Development, Bristol Myers Squibb Company, New Brunswick, NJ 08903, USA
| | - Junho Kim
- Department of Chemistry, Princeton University, Princeton, NJ 08544, USA
| | - Steven R Wisniewski
- Chemical Process Development, Bristol Myers Squibb Company, New Brunswick, NJ 08903, USA
| | - Paul J Chirik
- Department of Chemistry, Princeton University, Princeton, NJ 08544, USA
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2
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Matamoros E, Light ME, Cintas P, Palacios JC. Schiff Bases and Stereocontrolled Formation of Fused 1,3-Oxazolidines from 1-Amino-2-Indanol: A Systematic Study on Structure and Mechanism. Molecules 2023; 28:molecules28041670. [PMID: 36838659 PMCID: PMC9961571 DOI: 10.3390/molecules28041670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 01/13/2023] [Accepted: 01/31/2023] [Indexed: 02/12/2023] Open
Abstract
This paper thoroughly explores the formation of Schiff bases derived from salicylaldehydes and a conformationally restricted amino alcohol (1-amino-2-indanol), as well as the generation of 1,3-oxazolidines, a key heterocyclic core present in numerous bioactive compounds. We provide enough evidences, both experimental-including crystallographic analyses and DFT-based calculations on imine/enamine tautomerism in the solid state and solution. In the course of imine formation, a pentacyclic oxazolidine-oxazine structure could be isolated with complete stereocontrol, whose configuration has been determined by merging theory and experiment. Mechanistic studies reveal that, although oxazolidines can be obtained under kinetic conditions, the prevalence of imines obeys to thermodynamic control as they are the most stable structures. The stereochemical outcome of imine cyclization under acylating conditions leads to formation of 2,4-trans-oxazolidines.
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Affiliation(s)
- Esther Matamoros
- Department of Organic and Inorganic Chemistry, Faculty of Sciences and IACYS-Green Chemistry and Sustainable Development Unit, University of Extremadura, 06006 Badajoz, Spain
- Correspondence: (E.M.); (J.C.P.)
| | - Mark E. Light
- Department of Chemistry, Faculty of Engineering and Physical Sciences, University of Southampton, Southampton SO17 1BJ, UK
| | - Pedro Cintas
- Department of Organic and Inorganic Chemistry, Faculty of Sciences and IACYS-Green Chemistry and Sustainable Development Unit, University of Extremadura, 06006 Badajoz, Spain
| | - Juan C. Palacios
- Department of Organic and Inorganic Chemistry, Faculty of Sciences and IACYS-Green Chemistry and Sustainable Development Unit, University of Extremadura, 06006 Badajoz, Spain
- Correspondence: (E.M.); (J.C.P.)
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3
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Liang XX, Zhao XY, Guo A, Wang XW, Rong M, Chang L, Sun ZQ, Jin XD. Synthesis, crystal structure and antibacterial activity of zinc(II) complexes with Schiff bases derived from 5-fluorosalicylaldehyde. J COORD CHEM 2023. [DOI: 10.1080/00958972.2023.2170795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Xiao-Xue Liang
- College of Chemistry, Liaoning University, Shenyang, P.R. China
| | - Xin-Yu Zhao
- College of Chemistry, Liaoning University, Shenyang, P.R. China
| | - Ang Guo
- College of Chemistry, Liaoning University, Shenyang, P.R. China
| | - Xiao-Wen Wang
- College of Light Industry, Liaoning University, Shenyang, P.R. China
| | - Mei Rong
- College of Chemistry, Liaoning University, Shenyang, P.R. China
| | - Lin Chang
- College of Chemistry, Liaoning University, Shenyang, P.R. China
| | - Zhong-Qiao Sun
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang, P.R. China
| | - Xu-Dong Jin
- College of Chemistry, Liaoning University, Shenyang, P.R. China
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4
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Hamdan N, Khodir WKWA, Hamid SA, Nasir MHM, Hamzah AS, Cruz-Maya I, Guarino V. PCL/Gelatin/Graphene Oxide Electrospun Nanofibers: Effect of Surface Functionalization on In Vitro and Antibacterial Response. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:488. [PMID: 36770449 PMCID: PMC9921190 DOI: 10.3390/nano13030488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 01/09/2023] [Accepted: 01/21/2023] [Indexed: 06/18/2023]
Abstract
The emergence of resistance to pathogenic bacteria has resulted from the misuse of antibiotics used in wound treatment. Therefore, nanomaterial-based agents can be used to overcome these limitations. In this study, polycaprolactone (PCL)/gelatin/graphene oxide electrospun nanofibers (PGO) are functionalized via plasma treatment with the monomeric groups diallylamine (PGO-M1), acrylic acid (PGO-M2), and tert-butyl acrylate (PGO-M3) to enhance the action against bacteria cells. The surface functionalization influences the morphology, surface wettability, mechanical properties, and thermal stability of PGO nanofibers. PGO-M1 and PGO-M2 exhibit good antibacterial activity against Staphylococcus aureus and Escherichia coli, whereas PGO-M3 tends to reduce their antibacterial properties compared to PGO nanofibers. The highest proportion of dead bacteria cells is found on the surface of hydrophilic PGO-M1, whereas live cells are colonized on the surface of hydrophobic PGO-M3. Likewise, PGO-M1 shows a good interaction with L929, which is confirmed by the high levels of adhesion and proliferation with respect to the control. All the results confirm that surface functionalization can be strategically used as a tool to engineer PGO nanofibers with controlled antibacterial properties for the fabrication of highly versatile devices suitable for different applications (e.g., health, environmental pollution).
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Affiliation(s)
- Nazirah Hamdan
- Department of Chemistry, Kulliyyah of Science, International Islamic University Malaysia Kuantan Campus, Bandar Indera Mahkota, Kuantan 25200, Pahang, Malaysia
| | - Wan Khartini Wan Abdul Khodir
- Department of Chemistry, Kulliyyah of Science, International Islamic University Malaysia Kuantan Campus, Bandar Indera Mahkota, Kuantan 25200, Pahang, Malaysia
- SYNTOF, Kulliyyah of Science, International Islamic University Malaysia Kuantan Campus, Bandar Indera Mahkota, Kuantan 25200, Pahang, Malaysia
| | - Shafida Abd Hamid
- Department of Chemistry, Kulliyyah of Science, International Islamic University Malaysia Kuantan Campus, Bandar Indera Mahkota, Kuantan 25200, Pahang, Malaysia
- SYNTOF, Kulliyyah of Science, International Islamic University Malaysia Kuantan Campus, Bandar Indera Mahkota, Kuantan 25200, Pahang, Malaysia
| | - Mohd Hamzah Mohd Nasir
- Department of Biotechnology, Kulliyyah of Science, International Islamic University Malaysia Kuantan Campus, Bandar Indera Mahkota, Kuantan 25200, Pahang, Malaysia
| | - Ahmad Sazali Hamzah
- Institute of Science, Universiti Teknologi MARA, Shah Alam 40450, Selangor, Malaysia
| | - Iriczalli Cruz-Maya
- Institute of Polymers, Composites and Biomaterials, National Research Council of Italy, Mostra d’Oltremare Pad.20, V.le J.F.Kennedy 54, 80125 Naples, Italy
| | - Vincenzo Guarino
- Institute of Polymers, Composites and Biomaterials, National Research Council of Italy, Mostra d’Oltremare Pad.20, V.le J.F.Kennedy 54, 80125 Naples, Italy
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5
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Mishra SK, Parikh A, Rangan K, Sah AK. Crystal Structure of
N
‐(2‐Hydroxynapthylidene)‐L‐isoleucinyl‐4,6‐
O
‐ethylidene‐β‐D‐glucopyranosylamine and an Insight from Experimental and Theoretical Calculations. CRYSTAL RESEARCH AND TECHNOLOGY 2022. [DOI: 10.1002/crat.202200209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Santosh K. Mishra
- Department of Chemistry Birla Institute of Technology and Science, Pilani Pilani Campus Pilani Rajasthan 333031 India
| | - Anuvasita Parikh
- Department of Chemistry Birla Institute of Technology and Science, Pilani Pilani Campus Pilani Rajasthan 333031 India
| | - Krishnan Rangan
- Department of Chemistry Birla Institute of Technology and Science, Pilani Hyderabad Campus Hyderabad Telangana 500078 India
| | - Ajay K. Sah
- Department of Chemistry Birla Institute of Technology and Science, Pilani Pilani Campus Pilani Rajasthan 333031 India
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Garrido-Zoido JM, Cajina F, Matamoros E, Gil MV, Cintas P, Palacios JC. A synthetically benign one-pot construction of enamino-xanthene dyes. Org Biomol Chem 2022; 20:8108-8119. [PMID: 36214790 DOI: 10.1039/d2ob01358d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Polyhydroxylated phenols are components of biomass and precursors of pigments in plants. This paper reports a novel entry to xanthene dyes, involving the reaction of 2,4,6-trihydroxybenzaldehyde with primary aliphatic amines. This catalyst-free synthesis exhibits a high atom economy and can be conducted under eco-friendly conditions and operational simplicity.
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Affiliation(s)
- Juan Manuel Garrido-Zoido
- Departamento de Química Orgánica e Inorgánica, Facultad de Ciencias and IACYS-Unidad de Química Verde y Desarrollo Sostenible, Universidad de Extremadura, E-06006 Badajoz, Spain.
| | - Franklin Cajina
- Departamento de Química Orgánica e Inorgánica, Facultad de Ciencias and IACYS-Unidad de Química Verde y Desarrollo Sostenible, Universidad de Extremadura, E-06006 Badajoz, Spain.
| | - Esther Matamoros
- Departamento de Química Orgánica e Inorgánica, Facultad de Ciencias and IACYS-Unidad de Química Verde y Desarrollo Sostenible, Universidad de Extremadura, E-06006 Badajoz, Spain.
| | - M Victoria Gil
- Departamento de Química Orgánica e Inorgánica, Facultad de Ciencias and IACYS-Unidad de Química Verde y Desarrollo Sostenible, Universidad de Extremadura, E-06006 Badajoz, Spain.
| | - Pedro Cintas
- Departamento de Química Orgánica e Inorgánica, Facultad de Ciencias and IACYS-Unidad de Química Verde y Desarrollo Sostenible, Universidad de Extremadura, E-06006 Badajoz, Spain.
| | - Juan C Palacios
- Departamento de Química Orgánica e Inorgánica, Facultad de Ciencias and IACYS-Unidad de Química Verde y Desarrollo Sostenible, Universidad de Extremadura, E-06006 Badajoz, Spain.
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Babashkina MG, Panova EV, Alkhimova LE, Safin DA. Salen: Insight into the Crystal Structure, Hirshfeld Surface Analysis, Optical Properties, DFT, and Molecular Docking Studies. Polycycl Aromat Compd 2022. [DOI: 10.1080/10406638.2022.2097281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Maria G. Babashkina
- “Advanced Materials for Industry and Biomedicine” Laboratory, Kurgan State University, Kurgan, Russian Federation
| | - Elizaveta V. Panova
- “Advanced Materials for Industry and Biomedicine” Laboratory, Kurgan State University, Kurgan, Russian Federation
- University of Tyumen, Tyumen, Russian Federation
| | - Larisa E. Alkhimova
- “Advanced Materials for Industry and Biomedicine” Laboratory, Kurgan State University, Kurgan, Russian Federation
- University of Tyumen, Tyumen, Russian Federation
| | - Damir A. Safin
- “Advanced Materials for Industry and Biomedicine” Laboratory, Kurgan State University, Kurgan, Russian Federation
- University of Tyumen, Tyumen, Russian Federation
- Innovation Center for Chemical and Pharmaceutical Technologies, Ural Federal University Named after the First President of Russia B.N. Yeltsin, Ekaterinburg, Russian Federation
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8
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Abramenko VL, Sergienko VS, Churakov AV, Krivokolysko SG. Prototropic Tautomerism of 3-Nitro- and 5-Nitrosalicylidene-3-picolylimines. RUSS J GEN CHEM+ 2022. [DOI: 10.1134/s1070363222050024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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9
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Shiryaev AA, Goncharenko AN, Burkhanova TM, Alkhimova LE, Babashkina MG, Chandrasekaran R, Safin DA. A chiral (1R,2R)-N,N′-bis-(salicylidene)-1,2-diphenyl-1,2-ethanediamine Schiff base dye: synthesis, crystal structure, Hirshfeld surface analysis, computational study, photophysical properties and in silico antifungal activity. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2021. [DOI: 10.1007/s13738-021-02237-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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10
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Dasgupta S, Banerjee S, Das S, Datta A. From fluorogens to fluorophores by elucidation and suppression of ultrafast excited state processes of a Schiff base. Phys Chem Chem Phys 2021; 23:19494-19502. [PMID: 34524318 DOI: 10.1039/d1cp02540f] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Strategies have been explored for developing strongly fluorescent species out of a weakly fluorescent Schiff base, 2-(((pyridin-2-ylmethyl)imino)methyl)phenol (salampy). The locally excited enolic state of salampy undergoes an intramolecular proton transfer with a time constant of ca. 200 fs. The emissive cis keto state thus formed decays completely within 50 ps. Its fast decay and miniscule fluorescence quantum yield are attributed to efficient non-radiative channels associated with conformational relaxation. The anionic form, salampy-, has a significantly longer fluorescence lifetime of 800 ps. Its emissive state evolves in tens of picoseconds, from the locally excited state, by solvent and conformational relaxation. Both the neutral and anionic forms have a fluorescence lifetime of about 6 ns at 77 K, a temperature at which all activated nonradiative channels are blocked. This lifetime is similar to that obtained at room temperature, upon rigidification of the anion by complexation with Zn2+. Two such complexes have been studied. The first is binuclear, with acetate bridge between the two Zn2+ ions. The second, with ClO4- as the counterion, is mononuclear with two salampy ligands ligating the metal ion. Unlike a previous report on a different Schiff base, in which the ligands are π-stacked in its dimeric Zn2+ complex, no additional nonradiative deactivation pathway opens up in the Zn complexes of salampy, which are devoid of such stacking. The complex of salampy with Al3+ has an even longer fluorescence lifetime of 9 ns, indicating a greater degree of rigidification and consequent suppression of nonradiative processes.
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Affiliation(s)
- Souradip Dasgupta
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai 400076, India.
| | - Shrobona Banerjee
- Department of Chemistry, Indian Institute of Science Education and Research, Bhopal, Bhopal Bypass Rd, Bhauri, Madhya Pradesh 462066, India
| | - Sharmistha Das
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai 400076, India.
| | - Anindya Datta
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai 400076, India.
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11
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Hansen PE. A Spectroscopic Overview of Intramolecular Hydrogen Bonds of NH…O,S,N Type. Molecules 2021; 26:molecules26092409. [PMID: 33919132 PMCID: PMC8122615 DOI: 10.3390/molecules26092409] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 04/12/2021] [Accepted: 04/18/2021] [Indexed: 02/06/2023] Open
Abstract
Intramolecular NH…O,S,N interactions in non-tautomeric systems are reviewed in a broad range of compounds covering a variety of NH donors and hydrogen bond acceptors. 1H chemical shifts of NH donors are good tools to study intramolecular hydrogen bonding. However in some cases they have to be corrected for ring current effects. Deuterium isotope effects on 13C and 15N chemical shifts and primary isotope effects are usually used to judge the strength of hydrogen bonds. Primary isotope effects are investigated in a new range of magnitudes. Isotope ratios of NH stretching frequencies, νNH/ND, are revisited. Hydrogen bond energies are reviewed and two-bond deuterium isotope effects on 13C chemical shifts are investigated as a possible means of estimating hydrogen bond energies.
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Affiliation(s)
- Poul Erik Hansen
- Department of Science and Environment, Roskilde University, Universitetsvej 1, DK-4000 Roskilde, Denmark
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12
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Saha U, Mabhai S, Das B, Kumar GS, Brandão P, Dolai M. Combined theoretical and experimental investigation of a DNA interactive poly-hydroxyl enamine tautomer exhibiting “turn on” sensing for Zn 2+ in pseudo-aqueous medium. NEW J CHEM 2021. [DOI: 10.1039/d1nj03510j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Crystallographically established (solid state structure at 150 K temperature) synthesized enamine ligand (H4L) showed interconvertible equilibrium (ΔE = 7.37 kcal) of its tautomers, displayed zinc sensing and also found to exhibit DNA binding activity at the minor groove of double-stranded (ds) DNA.
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Affiliation(s)
- Urmila Saha
- Organic and Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology, 4, Raja S.C. Mullick Road, Kolkata 700 032, W.B., India
| | - Subhabrata Mabhai
- Department of Chemistry, Mahishadal Raj College, Purba Medinipur 721628, W.B., India
| | - Bhriguram Das
- Department of Chemistry, Vidyasagar University, Paschim Medinipur 721102, W. B., India
| | - Gopinatha Suresh Kumar
- Organic and Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology, 4, Raja S.C. Mullick Road, Kolkata 700 032, W.B., India
| | - Paula Brandão
- Department of Chemistry, CICECO-Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Malay Dolai
- Department of Chemistry, Prabhat Kumar College, Purba Medinipur 721404, W.B., India
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