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Ramadoss B, Jin Y, Asako S, Ilies L. Remote steric control for undirected meta-selective C-H activation of arenes. Science 2022; 375:658-663. [PMID: 35143323 DOI: 10.1126/science.abm7599] [Citation(s) in RCA: 32] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Regioselective functionalization of arenes remains a challenging problem in organic synthesis. Steric interactions are often used to block sites adjacent to a given substituent, but they do not distinguish the remaining remote sites. We report a strategy based on remote steric control, whereby a roof-like ligand protects the distant para site in addition to the ortho sites, and thereby enables selective activation of meta carbon-hydrogen (C-H) bonds in the absence of ortho or para substituents. We demonstrate this concept for iridium-catalyzed meta-selective borylation of various monosubstituted arenes, including complex drug molecules. This strategy has the potential to expand the toolbox of C-H bond functionalization to previously nondifferentiable reaction sites.
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Affiliation(s)
- Boobalan Ramadoss
- RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Yushu Jin
- RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Sobi Asako
- RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Laurean Ilies
- RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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2
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Lapasam A, Banothu V, Addepally U, Kollipara MR. Synthesis, structural and antimicrobial studies of half-sandwich ruthenium, rhodium and iridium complexes containing nitrogen donor Schiff-base ligands. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.04.116] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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3
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Cascade reactions as efficient and universal tools for construction and modification of 6-, 5-, 4- and 3-membered sulfur heterocycles of biological relevance. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.09.022] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Jäger S, Gude L, Arias-Pérez MS. 4,5-Diazafluorene N-glycopyranosyl hydrazones as scaffolds for potential bioactive metallo-organic compounds: Synthesis, structural study and cytotoxic activity. Bioorg Chem 2018; 81:405-413. [PMID: 30205247 DOI: 10.1016/j.bioorg.2018.08.019] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Revised: 08/08/2018] [Accepted: 08/14/2018] [Indexed: 02/05/2023]
Abstract
A series of novel N1-(4,5-diazafluoren-9-yliden)-N2-glycopyranosyl hydrazines was prepared in synthetically useful yields by treatment of 9H-4,5-diazafluoren-9-hydrazone with different unprotected monosaccharides. The reactions with the monosaccharides tested afforded stereoselectively, and exclusively, cyclic derivatives, whose structures correspond to N-β-glycopyranosyl hydrazones except for the d-arabinose derivative that agrees with the α-anomer. Several copper(II) complexes having a 2:1 ligand to metal mole ratio were also prepared. The metal complexes can bind DNA sequences and preferentially stabilize G-quadruplex DNA structures over dsDNA. The fucose, rhamnose and deoxyglucose copper(II) complexes exhibited a cytotoxic activity against cultured HeLa and PC3 tumor cells comparable to other metal complexes normally used for chemotherapeutic purposes, such as cisplatin.
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Affiliation(s)
- Sebastian Jäger
- Departamento de Química Orgánica y Química Inorgánica, Universidad de Alcalá, 28805-Alcalá de Henares, Madrid, Spain
| | - Lourdes Gude
- Departamento de Química Orgánica y Química Inorgánica, Universidad de Alcalá, 28805-Alcalá de Henares, Madrid, Spain; Instituto de Investigación Química Andrés M. del Río (IQAR), Universidad de Alcalá, 28805-Alcalá de Henares, Madrid, Spain
| | - María-Selma Arias-Pérez
- Departamento de Química Orgánica y Química Inorgánica, Universidad de Alcalá, 28805-Alcalá de Henares, Madrid, Spain.
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Synthesis of platinum(II) and palladium(II) complexes with 9,9-dihexyl-4,5-diazafluorene and their in vivo antitumour activity against Hep3B xenografted mice. Eur J Med Chem 2016; 124:537-543. [PMID: 27598239 DOI: 10.1016/j.ejmech.2016.08.033] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2016] [Revised: 08/16/2016] [Accepted: 08/17/2016] [Indexed: 02/06/2023]
Abstract
Two complexes dichloro(9,9-dihexyl-4,5-diazafluorene)platinum(II) (Pt-DHF) and dichloro(9,9-dihexyl-4,5-diazafluorene)palladium(II) (Pd-DHF) were synthesized and their in vivo antitumour activity was investigated using an athymic nude mice model xenografted with human Hep3B carcinoma cells. Pt-DHF- and Pd-DHF-treated groups showed significant tumour growth inhibition (with about 9-fold and 3-fold tumour growth retardation) when compared with the vehicle control group. The liver toxicology effects on the animals of the two compounds were investigated. Pt-DHF and Pd-DHF-treated groups had a lower alanine transaminase and aspartate transaminase values than those of the vehicle treated group as the animals from the vehicle control group had very heavy hepatoma burden. We assume that both complexes could be further investigated as effective antitumour agents and it is worthwhile to study their underlying working mechanism.
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Lin J, Liu B, Yu M, Xie L, Zhu W, Ling H, Zhang X, Ding X, Wang X, Stavrinou PN, Wang J, Bradley DDC, Huang W. Heteroatomic Conjugated Polymers and the Spectral Tuning of Electroluminescence via a Supramolecular Coordination Strategy. Macromol Rapid Commun 2016; 37:1807-1813. [DOI: 10.1002/marc.201600445] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Revised: 08/20/2016] [Indexed: 11/11/2022]
Affiliation(s)
- Jinyi Lin
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM); Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM); Nanjing Tech University (NanjingTech); 30 South Puzhu Road Nanjing 211816 China
- Department of Physics and Centre for Plastic Electronics; The Blackett Laboratory; Imperial College London; Prince Consort Road London SW7 2AZ UK
- Departments of Engineering Science and Physics and Mathematical; Physical and Life Sciences Division; University of Oxford; 9 Parks Road Oxford OX1 3PD UK
| | - Bin Liu
- Key Laboratory for Organic Electronics and Information Displays and Institute of Advanced Materials (IAM); Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM); Nanjing University of Posts and Telecommunications; 9 Wenyuan Road Nanjing 210023 China
| | - Mengna Yu
- Key Laboratory for Organic Electronics and Information Displays and Institute of Advanced Materials (IAM); Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM); Nanjing University of Posts and Telecommunications; 9 Wenyuan Road Nanjing 210023 China
| | - Linghai Xie
- Key Laboratory for Organic Electronics and Information Displays and Institute of Advanced Materials (IAM); Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM); Nanjing University of Posts and Telecommunications; 9 Wenyuan Road Nanjing 210023 China
| | - Wensai Zhu
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM); Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM); Nanjing Tech University (NanjingTech); 30 South Puzhu Road Nanjing 211816 China
| | - Haifeng Ling
- Key Laboratory for Organic Electronics and Information Displays and Institute of Advanced Materials (IAM); Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM); Nanjing University of Posts and Telecommunications; 9 Wenyuan Road Nanjing 210023 China
| | - Xinwen Zhang
- Key Laboratory for Organic Electronics and Information Displays and Institute of Advanced Materials (IAM); Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM); Nanjing University of Posts and Telecommunications; 9 Wenyuan Road Nanjing 210023 China
| | - Xuehua Ding
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM); Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM); Nanjing Tech University (NanjingTech); 30 South Puzhu Road Nanjing 211816 China
| | - Xuhua Wang
- Department of Physics and Centre for Plastic Electronics; The Blackett Laboratory; Imperial College London; Prince Consort Road London SW7 2AZ UK
| | - Paul N. Stavrinou
- Department of Engineering Science; University of Oxford; Parks Road Oxford OX1 3PJ UK
| | - Jianpu Wang
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM); Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM); Nanjing Tech University (NanjingTech); 30 South Puzhu Road Nanjing 211816 China
| | - Donal D. C. Bradley
- Departments of Engineering Science and Physics and Mathematical; Physical and Life Sciences Division; University of Oxford; 9 Parks Road Oxford OX1 3PD UK
| | - Wei Huang
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM); Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM); Nanjing Tech University (NanjingTech); 30 South Puzhu Road Nanjing 211816 China
- Key Laboratory for Organic Electronics and Information Displays and Institute of Advanced Materials (IAM); Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM); Nanjing University of Posts and Telecommunications; 9 Wenyuan Road Nanjing 210023 China
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Lam PL, Lee KKH, Kok SHL, Gambari R, Lam KH, Ho CL, Ma X, Lo YH, Wong WY, Dong QC, Bian ZX, Chui CH. Antifungal study of substituted 4-pyridylmethylene-4′-aniline Schiff bases. RSC Adv 2016. [DOI: 10.1039/c6ra20186e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Two substituted 4-pyridylmethylene-4′-aniline Schiff bases showed antifungal activity against.Aspergillus nigerandCandida albicans. They may be useful for the development of safe drug candidates forA. nigerandC. albicanscases of otomycosis.
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Barroso R, Cabal M, Badía‐Laiño R, Valdés C. Structurally Diverse π‐Extended Conjugated Polycarbo‐ and Heterocycles through Pd‐Catalyzed Autotandem Cascades. Chemistry 2015; 21:16463-73. [DOI: 10.1002/chem.201503080] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Indexed: 01/29/2023]
Affiliation(s)
- Raquel Barroso
- Departamento de Química Orgánica e Inorgánica and, Instituto Universitario de Química Organometálica, “Enrique Moles”, Universidad de Oviedo, c/Julián Clavería 8, Oviedo 33066 (Spain)
| | - María‐Paz Cabal
- Departamento de Química Orgánica e Inorgánica and, Instituto Universitario de Química Organometálica, “Enrique Moles”, Universidad de Oviedo, c/Julián Clavería 8, Oviedo 33066 (Spain)
| | - Rosana Badía‐Laiño
- Departamento de Química Física y Analítica, Universidad de Oviedo, c/Julián Clavería 8, Oviedo 33066 (Spain)
| | - Carlos Valdés
- Departamento de Química Orgánica e Inorgánica and, Instituto Universitario de Química Organometálica, “Enrique Moles”, Universidad de Oviedo, c/Julián Clavería 8, Oviedo 33066 (Spain)
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Lam PL, Lu GL, Hon KM, Lee KW, Ho CL, Wang X, Tang JCO, Lam KH, Wong RSM, Kok SHL, Bian ZX, Li H, Lee KKH, Gambari R, Chui CH, Wong WY. Development of ruthenium(II) complexes as topical antibiotics against methicillin resistant Staphylococcus aureus. Dalton Trans 2014; 43:3949-57. [PMID: 24448670 DOI: 10.1039/c3dt52879k] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A series of ruthenium(II) bis(2,2'-bipyridyl) complexes containing N-phenyl-substituted diazafluorenes (Ru-C1, Ru-C6, Ru-C7 and Ru-F) was synthesized and their potential antibacterial activity against methicillin resistant Staphylococcus aureus (MRSA) was investigated. The Ru-C7 complex showed significant improvement in both minimum inhibitory concentration (MIC, 6.25 μg mL(-1)) and minimum bactericidal concentration (MBC, 25 μg mL(-1)) towards MRSA when compared with those of methicillin (positive control) (MIC = 25 μg mL(-1) and MBC = 100 μg mL(-1)). The Ru-C7 complex possessed much stronger antibacterial effects than the Ru-C6 complex (MIC, 25 μg mL(-1), MBC, >100 μg mL(-1)). Both Ru-C6 and Ru-C7 complexes were also demonstrated to be biologically safe when tested on normal human skin keratinocytes.
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Affiliation(s)
- P-L Lam
- State Key Laboratory of Chirosciences, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong, P.R. China
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Li WJ, Liu B, Qian Y, Xie LH, Wang J, Li SB, Huang W. Synthesis and characterization of diazafluorene-based oligofluorenes and polyfluorene. Polym Chem 2013. [DOI: 10.1039/c2py20971c] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Li WJ, Wu HM, Li YB, Hu CP, Yi MD, Xie LH, Chen L, Zhao JF, Zhao XH, Shi NE, Qian Y, Wang C, Wei W, Huang W. Facile synthesis and self-assembly of diazafluorenone-based p–n (donor–acceptor) organic semiconductors. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.07.066] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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12
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Lam PL, Yuen MCW, Kan CW, Wong RSM, Cheng GYM, Lam KH, Gambari R, Kok SHL, Chui CH. Development of Calendula Oil/Chitosan Microcapsules and their Biological Safety Evaluation. Aust J Chem 2012. [DOI: 10.1071/ch11386] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Chitosan microcapsules containing calendula oil are prepared by a simple coacervation method. The results show that the performance of the microcapsules, including encapsulation efficiency and particle size, is affected by the change of various processing parameters of microcapsule manufacture. Under the optimal parameter combinations: the chitosan concentration is 1.5 % w/v; the core/wall ratio is 0.1 g mL–1; the stirring speed is 1200 rpm; and the pH value is 10. The compositions and surface morphology of the microcapsules are examined using scanning electron microscope and FTIR spectroscopy. The in vitro cytotoxicity evaluation demonstrates that the microcapsules exhibit no significant cytotoxic effects on human keratinocytes. The in vivo toxicology analysis on mice proves that the microcapsules do not exert any significant necrosis to the liver. It is suggested that our microcapsules could be used as a safe drug carrier both topically and orally.
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Yuen CWM, Kan CW, Cheuk KL, Cheung HC, Cheng SY, Yip J, Lam PL. Development of miconazole nitrate containing chitosan microcapsules and their anti-Aspergillus nigeractivity. J Microencapsul 2011; 29:505-10. [DOI: 10.3109/02652048.2011.642017] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Li L, Chow WC, Wong WY, Chui CH, Wong RSM. Synthesis, characterization and photovoltaic behavior of platinum acetylide polymers with electron-deficient 9,10-anthraquinone moiety. J Organomet Chem 2011. [DOI: 10.1016/j.jorganchem.2010.08.044] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Hau DKP, Zhu GY, Leung AKM, Wong RSM, Cheng GYM, Lai PBS, Tong SW, Lau FY, Chan KW, Wong WY, Lam KH, Cheng CH, Cheung F, Chui CH, Gambari R, Fong DWF. In vivo anti-tumour activity of corilagin on Hep3B hepatocellular carcinoma. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2010; 18:11-15. [PMID: 21036022 DOI: 10.1016/j.phymed.2010.09.001] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2010] [Revised: 07/19/2010] [Accepted: 09/04/2010] [Indexed: 05/30/2023]
Abstract
We have investigated the potential in vivo anti-tumour activity of corilagin using the Hep3B hepatocellular carcinoma cell line and an athymic nude mice xenograft model. The purity of corilagin was confirmed by high performance liquid chromatographic analysis. Corilagin was administrated intraperitoneally for a continuous period of 7 days at a concentration of 15 mg/kg of body weight per day. A significant inhibition of tumour growth was observed when treated mice are compared with control groups. Furthermore, analysis of enzymes markers of liver function, including alanine aminotransferase and asparate aminotransferase, suggested that current therapeutic dosage of corilagin did not exert adverse effect on liver. Our observations support the view that corilagin is considerably effective to retard the in vivo growth of xenografted Hep3B hepatocellular carcinoma.
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Affiliation(s)
- Desmond Kwok-Po Hau
- Research and Development Division, School of Chinese Medicine, Hong Kong Baptist University, Hong Kong, China
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