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Yadav I, Prakash V, Maurya MR, Sankar M. Oxido-Molybdenum(V) Corroles as Robust Catalysts for Oxidative Bromination and Selective Epoxidation Reactions in Aqueous Media under Mild Conditions. Inorg Chem 2023; 62:5292-5301. [PMID: 36958040 DOI: 10.1021/acs.inorgchem.3c00504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/25/2023]
Abstract
Two new meso-substituted oxido-molybdenum corroles were synthesized and characterized by various spectroscopic techniques. In the thermogram, MoO[TTC] (1) exhibited excellent thermal stability up to 491 °C while MoO[TNPC] (2) exhibited good stability up to 318 °C. The oxidation states of the molybdenum(V) were verified by electron paramagnetic resonance (EPR) spectroscopy and exhibited an axial compression with dxy1 configuration. Oxido-molybdenum(V) complexes were utilized for the selective epoxidation of various olefins with high TOF values (2066-3287 h-1) in good yields in a CH3CN/H2O (3:2, v/v) mixture in the presence of hydrogen peroxide as a green oxidant and NaHCO3 as a promoter. The oxidative bromination catalytic activity of oxido-molybdenum(V) complexes in an aqueous medium has been reported for the first time. Surprisingly, MoO[TNPC] (2) biomimics of the vanadium bromoperoxidase (VBPO) enzyme activity exhibited remarkably high TOF values (36 988-61 646 h-1) for the selective oxidative bromination of p-cresol and other phenol derivatives. Catalyst MoO[TNPC] (2) exhibited higher TOF values and better catalytic activity than catalyst MoO[TTC] (1) due to the presence of electron-withdrawing nitro groups evident from cyclic voltammetric studies.
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Affiliation(s)
- Inderpal Yadav
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India
| | - Ved Prakash
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India
| | - Mannar R Maurya
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India
| | - Muniappan Sankar
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India
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Affiliation(s)
- Dominika Roos
- Eberhard Karls Universität Tübingen Institut für Organische Chemie Auf der Morgenstelle 18 72076 Tübingen Germany
| | - Martin E. Maier
- Eberhard Karls Universität Tübingen Institut für Organische Chemie Auf der Morgenstelle 18 72076 Tübingen Germany
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Wang L, Feng C, Zhang Y, Hu J. Regioselective Monobromination of Phenols with KBr and ZnAl-BrO 3--Layered Double Hydroxides. Molecules 2020; 25:E914. [PMID: 32085603 PMCID: PMC7070364 DOI: 10.3390/molecules25040914] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2020] [Revised: 02/15/2020] [Accepted: 02/16/2020] [Indexed: 11/19/2022] Open
Abstract
The regioselective mono-bromination of phenols has been successfully developed with KBr and ZnAl-BrO3--layered double hydroxides (abbreviated as ZnAl-BrO3--LDHs) as brominating reagents. The para site is much favorable and the ortho site takes the priority if para site is occupied. This reaction featured with excellent regioselectivity, cheap brominating reagents, mild reaction condition, high atom economy, broad substrate scope, and provided an efficient method to synthesize bromophenols.
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Affiliation(s)
- Ligeng Wang
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310004, China; (C.F.); (Y.Z.)
| | | | | | - Jun Hu
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310004, China; (C.F.); (Y.Z.)
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Righi D, Marcourt L, Koval A, Ducret V, Pellissier L, Mainetti A, Katanaev VL, Perron K, Wolfender JL, Queiroz EF. Chemo-Diversification of Plant Extracts Using a Generic Bromination Reaction and Monitoring by Metabolite Profiling. ACS COMBINATORIAL SCIENCE 2019; 21:171-182. [PMID: 30607939 DOI: 10.1021/acscombsci.8b00132] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
A generic procedure for direct bromination of polyphenol in crude plant extracts was developed to generate multiple "unnatural" halogenated natural products for further bioassay evaluation. To better control the halogenation procedure, the bromination was optimized with a flavonoid standard, and the reactions were monitored by high-performance liquid chromatography photometric diode array coupled to the evaporative light scattering detection (ELSD). ELSD detection was successfully used for a relative yield estimation of the compounds obtained. From the halogenation of hesperitin (11), five brominated compounds were obtained. After optimization, the reaction was successfully applied to the methanolic extract of Citrus sinensis peels, a typical waste biomass and also to the methanolic extract of the medicinal plant Curcuma longa. In both cases, the methanolic extracts were profiled by NMR for a rapid estimation of the polyphenol versus primary metabolite content. An enriched secondary metabolites extract was obtained using vacuum liquid chromatography and submitted to bromination. Metabolite profiling performed by ultrahigh purity liquid chromatography time-of-flight high-resolution mass spectrometry revealed the presence of various halogenated products. To isolate these compounds, the reactions were scaled up, and six halogenated analogues were isolated and fully characterized by NMR and high-resolution electrospray ionization mass spectrometry analyses. The antibacterial properties of these compounds were evaluated using in vitro bioassays against multiresistant strains of Staphylococcus aureus and Pseudomonas aeruginosa. Some of the halogenated derivatives obtained presented moderate antibacterial properties.
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Affiliation(s)
| | | | | | - Verena Ducret
- Microbiology Unit, Department of Botany and Plant Biology, University of Geneva, 30 quai Ernest-Ansermet, 1211 Geneva 4, Switzerland
| | | | | | - Vladimir L. Katanaev
- School of Biomedicine, Far Eastern Federal University, 8 Sukhanova St., 690090 Vladivostok, Russia
| | - Karl Perron
- Microbiology Unit, Department of Botany and Plant Biology, University of Geneva, 30 quai Ernest-Ansermet, 1211 Geneva 4, Switzerland
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Smith K, Al-Zuhairi AJ, Elliott MC, El-Hiti GA. Regioselective synthesis of important chlorophenols in the presence of methylthioalkanes with remote SMe, OMe or OH substituents. J Sulphur Chem 2018. [DOI: 10.1080/17415993.2018.1493111] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Keith Smith
- School of Chemistry, Cardiff University, Cardiff, UK
| | | | | | - Gamal A. El-Hiti
- Cornea Research Chair, Department of Optometry, College of Applied Medical Sciences, King Saud University, Riyadh, Saudi Arabia
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Buckler JN, Taher ES, Fraser NJ, Willis AC, Carr PD, Jackson CJ, Banwell MG. The Synthesis of Certain Derivatives and Analogues of (−)- and (+)-Galanthamine and an Assessment of their Capacities to Inhibit Acetylcholine Esterase. J Org Chem 2017; 82:7869-7886. [DOI: 10.1021/acs.joc.7b01062] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Joshua N. Buckler
- Research School of Chemistry,
Institute of Advanced Studies, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Ehab S. Taher
- Research School of Chemistry,
Institute of Advanced Studies, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Nicolas J. Fraser
- Research School of Chemistry,
Institute of Advanced Studies, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Anthony C. Willis
- Research School of Chemistry,
Institute of Advanced Studies, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Paul D. Carr
- Research School of Chemistry,
Institute of Advanced Studies, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Colin J. Jackson
- Research School of Chemistry,
Institute of Advanced Studies, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Martin G. Banwell
- Research School of Chemistry,
Institute of Advanced Studies, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
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Johnston HJ, Boys SK, Makda A, Carragher NO, Hulme AN. Naturally Inspired Peptide Leads: Alanine Scanning Reveals an Actin-Targeting Thiazole Analogue of Bisebromoamide. Chembiochem 2016; 17:1621-7. [PMID: 27304907 PMCID: PMC5096027 DOI: 10.1002/cbic.201600257] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Indexed: 12/29/2022]
Abstract
Systematic alanine scanning of the linear peptide bisebromoamide (BBA), isolated from a marine cyanobacterium, was enabled by solid-phase peptide synthesis of thiazole analogues. The analogues have comparable cytotoxicity (nanomolar) to that of BBA, and cellular morphology assays indicated that they target the actin cytoskeleton. Pathway inhibition in human colon tumour (HCT116) cells was explored by reverse phase protein array (RPPA) analysis, which showed a dose-dependent response in IRS-1 expression. Alanine scanning reveals a structural dependence to the cytotoxicity, actin targeting and pathway inhibition, and allows a new readily synthesised lead to be proposed.
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Affiliation(s)
- Heather J Johnston
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh, EH9 3FJ, UK
| | - Sarah K Boys
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh, EH9 3FJ, UK
| | - Ashraff Makda
- Edinburgh Cancer Research Centre, Institute of Genetics and Molecular Medicine, University of Edinburgh, Crewe Road South, Edinburgh, EH4 2XR, UK
| | - Neil O Carragher
- Edinburgh Cancer Research Centre, Institute of Genetics and Molecular Medicine, University of Edinburgh, Crewe Road South, Edinburgh, EH4 2XR, UK
| | - Alison N Hulme
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh, EH9 3FJ, UK.
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Studzińska R, Kołodziejska R, Kosmalski T, Modzelewska-Banachiewicz B. Regioselective Bromination of 2-Iodomethyl-2,3-Dihydrothiazolo[3,2-a]pyrimidin-5-one. HETEROCYCLES 2016. [DOI: 10.3987/com-16-13592] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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