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Facile synthesis of benzazoles through biocatalytic cyclization and dehydrogenation employing catalase in water. Enzyme Microb Technol 2020; 138:109562. [PMID: 32527531 DOI: 10.1016/j.enzmictec.2020.109562] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Revised: 03/18/2020] [Accepted: 03/30/2020] [Indexed: 11/21/2022]
Abstract
The benzazoles are very important entities having immense biological activities, hence; the synthesis of benzazoles is one of the prime areas for synthetic chemists. In pursuit of sustainable protocol, herein an oxidative enzyme i.e. catalase mediated sustainable synthesis is presented. Catalase is a metalloenzyme which is essential for the breakdown of toxic hydrogen peroxide into water and oxygen inside the cell. Despite the higher activity and turnover number of catalase inside the cell, its activity outside the cell is unexplored. Therefore, to explore the hidden potential of catalase for catalyzing the organic transformations, here we reported a green and efficient method for synthesis of benzazoles by the cyclocondensation of o-aminothiophenol or o-phenylenediammine and various aryl aldehydes with ensuing dehydrogenation. This protocol is greener, sustainable and rapid with excellent yields of the products and in addition to this, the catalase demonstrates good functional group tolerance.
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Najari S, Jafarzadeh M, Bahrami K. Copper(II) Oxide Nanoparticles Impregnated on Melamine‐Modified UiO‐66‐NH
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Metal–Organic Framework for C–N Cross‐Coupling Reaction and Synthesis of 2‐Substituted Benzimidazoles. J Heterocycl Chem 2019. [DOI: 10.1002/jhet.3675] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Susan Najari
- Faculty of ChemistryRazi University Kermanshah 67149‐67346 Iran
| | | | - Kiumars Bahrami
- Faculty of ChemistryRazi University Kermanshah 67149‐67346 Iran
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3
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Saima, Soni I, Lavekar AG, Shukla M, Equbal D, Sinha AK, Chopra S. Biocatalytic synthesis of diaryl disulphides and their bio-evaluation as potent inhibitors of drug-resistant Staphylococcus aureus. Drug Dev Res 2018; 80:171-178. [PMID: 30565263 DOI: 10.1002/ddr.21507] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Revised: 11/06/2018] [Accepted: 11/28/2018] [Indexed: 11/11/2022]
Abstract
Staphylococcus aureus is a WHO Priority II pathogen for its capability to cause acute to chronic infections and to resist antibiotics, thus severely impacting healthcare systems worldwide. In this context, it is urgently desired to discover novel molecules to thwart the continuing emergence of antimicrobial resistance. Disulphide containing small molecules has gained prominence as antibacterials. As their conventional synthesis requires tedious synthetic procedure and sometimes toxic reagents, a green and environmentally benign protocol for their synthesis has been developed through which a series of molecules were obtained and evaluated for antibacterial activity against ESKAPE pathogen panel. The hit compound was tested for cytotoxicity against Vero cells to determine its selectivity index and time-kill kinetics was determined. The activity of hit was determined against a panel of S. aureus multi-drug resistant clinical isolates. Also, its ability to synergize with FDA approved drugs was tested as was its ability to reduce biofilm. We identified bis(2-bromophenyl) disulphide (2t) as possessing equipotent antimicrobial activity against S. aureus including MRSA and VRSA strains. Further, 2t exhibited a selectivity index of 25 with concentration-dependent bactericidal activity, synergized with all drugs tested and significantly reduced preformed biofilm. Taken together, 2t exhibits all properties to be positioned as novel scaffold for anti-staphylococcal therapy.
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Affiliation(s)
- Saima
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, Uttar Pradesh, India.,Academy of Scientific and Innovative Research (AcSIR), New Delhi, India
| | - Isha Soni
- Division of Microbiology, CSIR-Central Drug Research Institute, Lucknow, Uttar Pradesh, India
| | - Aditya G Lavekar
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, Uttar Pradesh, India
| | - Manjulika Shukla
- Division of Microbiology, CSIR-Central Drug Research Institute, Lucknow, Uttar Pradesh, India
| | - Danish Equbal
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, Uttar Pradesh, India
| | - Arun K Sinha
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, Uttar Pradesh, India.,Academy of Scientific and Innovative Research (AcSIR), New Delhi, India
| | - Sidharth Chopra
- Academy of Scientific and Innovative Research (AcSIR), New Delhi, India.,Division of Microbiology, CSIR-Central Drug Research Institute, Lucknow, Uttar Pradesh, India
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Saha M, Das AR. I2/TBHP promoted oxidative C–N bond formation at room temperature: Divergent access of 2-substituted benzimidazoles involving ring distortion. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.05.028] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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5
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Saha M, Mukherjee P, Das AR. Practical application of PhI(OAc)2/I2 combination to synthesize benzimidazoles from 2-aminobenzylamine through ring distortion strategy. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.01.099] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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