- Synthesis and extraction studies of 1,2- And 1,3-disubstituted butylcalix[4]arene amides with oxyions; geometric and conformational effects
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26,28-(Dibutylcarbamoyl)methoxy-5,11,17,23-tert-butylcalix[4]arene and two geometric isomers of 27,28-(dibutylcarbamoyl)methoxy-5,11,17,23-tert-butylcalix[4]arene have been used to extract UVI, MoVI, CrVI and SeVI from aqueous solution into toluene or isooctane.
- Falana, Olusegun M.,Koch, H. Fred,Roundhill, D. Max,Lumetta, Gregg J.,Hay, Benjamin P.
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Read Online
- Development of Membrane-Active Honokiol/Magnolol Amphiphiles as Potent Antibacterial Agents against Methicillin-Resistant Staphylococcus aureus (MRSA)
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Currently, infections caused by drug-resistant bacteria have become a new challenge in anti-infective treatment, seriously endangering public health. In our continuous effort to develop new antimicrobials, a series of novel honokiol/magnolol amphiphiles were prepared by mimicking the chemical structures and antibacterial properties of cationic antimicrobial peptides. Among them, compound 5i showed excellent antibacterial activity against Gram-positive bacteria and clinical MRSA isolates (minimum inhibitory concentrations (MICs) = 0.5-2 μg/mL) with low hemolytic and cytotoxic activities and high membrane selectivity. Moreover, 5i exhibited rapid bactericidal properties, low resistance frequency, and good capabilities of disrupting bacterial biofilms. Mechanism studies revealed that 5i destroyed bacterial cell membranes, resulting in bacterial death. Additionally, 5i displayed high biosafety and potent in vivo anti-infective potency in a murine sepsis model. Our study indicates that these honokiol/magnolol amphiphiles shed light on developing novel antibacterial agents, and 5i is a potential antibacterial candidate for combating MRSA infections.
- Bai, Li-Ping,Fu, Xiangjing,Guo, Yong,Han, Meiyue,Hou, Enhua,Liu, Jifeng,Qin, Shangshang,Wen, Tingyu,Yan, Xiaoting
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Read Online
- Biomimetic synthesis and anti-inflammatory evaluation of violacin A analogues
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Violacin A, a chromanone derivative, isolated from a fermentation broth of Streptomyces violaceoruber, has excellent anti-inflammatory potential. Herein, a biogenetically modeled approach to synthesize violacin A and twenty-five analogues was described, which involved the preparation of aromatic polyketide precursor through Claisen condensation and its spontaneous cyclization. The inhibitory effect on nitric oxide (NO) production of all synthetic molecules was evaluated by lipopolysaccharide (LPS)-induced Raw264.7 cells. The results revealed that introduction of aliphatic amine moieties on C-7 obviously improved the anti-inflammation effect of violacin A, and also the aromatic ether instead of ketone group at side chain was favorable to increase the activity. Among them, analogue 7a and 16d were screened as the most effective anti-inflammatory candidates. Molecular mechanism research revealed that 7a and 16d acquired anti-inflammatory ability due to the inhibition of NF-κB signaling pathway.
- Wu, Wenxi,Mu, Yu,Liu, Bo,Wang, Zixuan,Guan, Peipei,Han, Li,Jiang, Mingguo,Huang, Xueshi
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- Low-toxicity amphiphilic molecules linked by an aromatic nucleus show broad-spectrum antibacterial activity and low drug resistance
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Amphiphilic molecules linked by an aromatic nucleus were developed that showed high selectivity toward bacteria over mammalian cells, and low drug resistance. A promising compound 4g exhibited strong bactericidal activity against a panel of sensitive and resistant bacteria, low toxicity, the ability to reduce cell viability in biofilms, stability in mammalian fluids, rapid killing of pathogens, and high in vivo efficacy against methicillin-resistant Staphylococcus aureus (MRSA).
- Chu, Wenchao,Yang, Yi,Qin, Shangshang,Cai, Jianfeng,Bai, Mengmeng,Kong, Hongtao,Zhang, En
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supporting information
p. 4307 - 4310
(2019/04/17)
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- Amide aromatic phenol antibacterial peptide analogue with antibacterial activity and preparation method thereof
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The invention belongs to the technical field of pharmaceutical chemistry, and discloses an amide aromatic phenol antibacterial peptide analogue with drug-resistance bacteria resistant activity and without obvious toxicity and a preparation method thereof. The target product is obtained by 3-4 reaction steps, and the main structure of the product is shown as follows. In-vitro antibacterial activityexperiments prove that most of the series of compounds have excellent activity on Gram-positive staphylococcus aureus and enterococcus faecalis, Gram-negative Escherichia coli and stenotrophomonas maltophilia, and the compounds have excellent broad spectrum antibacterial activity; moreover, in-vitro red cell hemolytic data is low in toxicity and has excellent selectivity. One part of the compounds also have excellent antibacterial activity on 'superbacteria' comprising drug-resistant methicillin staphylococcus aureus (MRSA), clinical strains producing enzymes NDM-1 and KPC-2 and the like. Therefore, the series of compounds are expected to serve as novel antibacterial candidate drugs.
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Paragraph 0085; 0086; 0098
(2018/12/03)
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- Enantioselective copper catalysed C-H insertion reaction of 2-sulfonyl-2-diazoacetamides to form γ-lactams
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The first examples of asymmetric copper-catalysed intramolecular C-H insertion reactions of 2-sulfonyl-2-diazoacetamides are described; trans γ-lactams with up to 82% ee are achieved with the CuCl2-bisoxazoline-NaBARF catalyst system. The reactions generally display high efficiency and high trans selectivity, and also a strong regiochemical preference for insertion to lead to the formation of 5-membered rings over 4-membered rings. In cases where there are competing C-H insertion pathways available, to form sulfolanes or thiopyrans, only the insertion into the amide chain to form γ-lactams is observed. With phenylsulfonyl derivatives, a minor competing C-H insertion pathway leading to β-lactams is seen; interestingly, changing the identity of the copper ligand changes the product ratio of β/γ-lactams. The copper catalysed reactions compare favorably in terms of efficiency and enantioselectivity to the corresponding reactions catalysed by commercially available chiral rhodium catalysts.
- Clarke, Leslie Ann,Ring, Aoife,Ford, Alan,Sinha, Abhijeet S.,Lawrence, Simon E.,Maguire, Anita R.
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p. 7612 - 7628
(2015/02/18)
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- Synthesis of berberine bromide analogs containing tertiary amides of acetic acid in the 9-O-position
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9-O-Acetamide analogs of berberine bromide were prepared in 20-87% yields via reaction of the isoquinoline alkaloid berberrubine with tertiary amides of bromoacetic acid. Aminolysis did not occur during reaction of methyl-2-(9-demethoxyberberine bromide-9-yl)hydroxyacetate with secondary amines. The corresponding acid or its ethyl ester was isolated.
- Nechepurenko,Komarova,Vasil'ev,Salakhutdinov
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p. 1047 - 1053
(2013/04/23)
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- Synthesis and structure-activity relationship studies in translocator protein ligands based on a pyrazolo[3,4-b]quinoline scaffold
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As a further development of our large program focused on the medicinal chemistry of translocator protein [TSPO (18 kDa)] ligands, a new class of compounds related to alpidem has been designed using SSR180575, emapunil, and previously published pyrrolo[3,4-b]quinoline derivatives 9 as templates. The designed compounds were synthesized by alkylation of the easily accessible 4-methyl-2-phenyl-1H-pyrazolo[3,4-b]quinolin-3(2H)-one derivatives 13-15 with the required bromoacetamides. Along with the expected 2-(4-methyl-3-oxo-2- phenyl-2,3-dihydro-1H-pyrazolo[3,4-b]quinolin-1-yl)acetamide derivatives 10, 2-(4-methyl-3-oxo-2-phenyl-2H-pyrazolo[3,4-b]quinolin-9(3H)-yl)acetamide isomers 11 were isolated and characterized. The high TSPO affinity shown by new pyrazolo[3,4-b]quinoline derivatives 10 and especially 11 leads the way to further expand the chemical diversity in TSPO ligands and provides new templates and structure-affinity relationship data potentially useful in the design of new anxiolytic and neuroprotective agents.
- Cappelli, Andrea,Bini, Giulia,Valenti, Salvatore,Giuliani, Germano,Paolino, Marco,Anzini, Maurizio,Vomero, Salvatore,Giorgi, Gianluca,Giordani, Antonio,Stasi, Luigi Piero,Makovec, Francesco,Ghelardini, Carla,Di Cesare Mannelli, Lorenzo,Concas, Alessandra,Porcu, Patrizia,Biggio, Giovanni
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supporting information; experimental part
p. 7165 - 7175
(2011/12/04)
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- ATRASENTAN HYDROCHLORIDE CRYSTALLINE FORM 2
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Atrasentan Hydrochloride Crystalline Form 2, compositions containing it and methods of treatment of diseases and inhibition of adverse physiological events using it are disclosed.
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Page/Page column 8
(2008/12/05)
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- CRYSTALLINE FORM 1 OF ATRASENTAN HXDROCHLORIDE
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Atrasentan Hydrochloride Crystalline Form 1, compositions containing it and methods of treatment of diseases and inhibition of adverse physiological events using it are disclosed.
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Page/Page column 22
(2008/06/13)
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- CRYSTALLINE FORM 3 OF ATRASENTAN HYDROCHLORIDE
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Atrasentan Hydrochloride Crystalline Form 3, compositions containing it and methods of treatment of diseases and inhibition of adverse physiological events using it are disclosed
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Page/Page column 15
(2008/06/13)
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- Crystalline form of a drug
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Atrasentan Hydrochloride Crystalline Form 2, compositions containing it and methods of treatment of diseases and inhibition of adverse physiological events using it are disclosed.
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Page/Page column 9
(2010/10/20)
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- CRYSTALLINE FORM OF ATRASENTAN HYDROCHLORIDE
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Substantially amorphous atrasentan hydrochloride, compositions containing it and methods of treatment of diseases and inhibition of adverse physiological events using it are disclosed.
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Page/Page column 12; 13
(2010/10/20)
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- OPHTHALMIC COMPOSITIONS FOR TREATING OCULAR HYPERTENSION
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This invention relates to potent potassium channel blocker compounds of structural Formula I or a formulation thereof for the treatment of glaucoma and other conditions which leads to elevated intraoccular pressure in the eye of a patient. This invention also relates to the use of such compounds to provide a neuroprotective effect to the eye of mammalian species, particularly humans.
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(2008/06/13)
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- THERAPEUTICS
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The present invention relates to the use of a compound of formula (I); wherein: R1 comprises a carbonyl group and R2 is a hydrocarbyl group; optionally wherein said ring is further substituted; or a pharmaceutically acceptable salt thereof; in the manufacture of a medicament for use in one or more of: modulating the release of intracellular calcium from a store controlled by nicotinic acid adenine dinucleotide phosphate; modulating calcium spikes in mammalian cells; treating diseases in one or more of brain, heart, pancreatic cells (e.g. pancreatic acinar and pancreatic beta cells), immune cells, T-cells, haemopoietic cells including phagocytes; treating diseases in one or more of brain, heart, pancreatic cells (e.g. pancreatic acinar and pancreatic beta cells), immune cells, T-cells, haemopoietic cells including phagocytes by modulating the release of intracellular calcium from a store controlled by nicotinic acid adenine dinucleotide phosphate; treating diseases in one or more of brain, heart, and T-cells by modulating calcium spikes in mammalian cells.
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Page/Page column 56
(2008/06/13)
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- 2,4-diarylpyrrolidine-3-carboxylic acids - Potent ETA selective endothelin receptor antagonists. 1. Discovery of A-127722
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We have discovered a novel class of endothelin (ET) receptor antagonists through pharmacophore analysis of the existing non-peptide ET antagonists. On the basis of this analysis, we determined that a pyrrolidine ring might replace the indan ring in SB 209670. The resultant compounds were readily prepared and amenable to extensive SAR studies. Thus a series of N-substituted trans,trans-2-(4-methoxyphenyl)-4-(1,3-benzodioxol-5-yl)pyrrolidine-3-carboxylic acids (8) have been synthesized and evaluated for binding at ETA and ETB receptors. Compounds with N-acyl and simple N-alkyl substituents had weak activity. Compounds with N-alkyl substituents containing ethers, sulfoxides, or sulfones showed increased activity. Much improved activity resulted from compounds where the N-substituents were acetamides. Compound 17u (A-127722) with the N,N-dibutylacetamide substituent is the best of the series. It has an IC50 = 0.36 nM for inhibition of ET-1 radioligand binding at the ETA receptor, with a 1000-fold selectivity for the ETA vs the ETB receptor. It is also a potent inhibitor (IC50 = 0.16 nM) of phosphoinositol hydrolysis stimulated by ET-1, and it antagonized the ET-1-induced contraction of the rabbit aorta with a pA2 = 9.20. The compound has 70% oral bioavailability in rats.
- Winn, Martin,Von Geldern, Thomas W.,Opgenorth, Terry J.,Jae, Hwan-Soo,Tasker, Andrew S.,Boyd, Steven A.,Kester, Jeffrey A.,Mantei, Robert A.,Bal, Radhika,Sorensen, Bryan K.,Wu-Wong, Jinshyun R.,Chiou, William J.,Dixon, Douglas B.,Novosad, Eugene I.,Hernandez, Lisa,Marsh, Kennan C.
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p. 1039 - 1048
(2007/10/03)
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