- Photoactive and physical properties of an azobenzene-containing coordination framework
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A new three-dimensional coordination framework, [Zn4(tbazip)3(bpe)2(OH)2]·bpe·{solvent} (where bpe≤1,2-di(4-pyridyl)ethene) containing the novel photoactive ligand tbazip (tbazip≤5-((4-tert-butyl)phenylazo)isophthalic acid) has been synthesised and crystallographically characterised. The photoactivity of discrete tbazip was investigated and compared with its photoactivity while incorporated within the framework. The effect of isomerisation of the incorporated azobenzene on the chemical and physical properties of the framework were investigated using UV-vis and Raman spectroscopies. The framework is porous only to hydrogen gas at 77K, but displayed an appreciable uptake for CO2 at 195K.
- Caddy, James S.,Faust, Thomas B.,Walton, Ian M.,Cox, Jordan M.,Benedict, Jason B.,Solomon, Marcello B.,Southon, Peter D.,Kepert, Cameron J.,D'Alessandro, Deanna M.
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Read Online
- Design, synthesis, and biological characterization of a new class of symmetrical polyamine-based small molecule CXCR4 antagonists
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CXCR4, a well-studied coreceptor of human immunodeficiency virus type 1 (HIV-1) entry, recognizes its cognate ligand SDF-1α (also named CXCL12) which plays many important roles, including regulating immune cells, controlling hematopoietic stem cells, and directing cancer cells migration. These pleiotropic roles make CXCR4 an attractive target to mitigate human disorders. Here a new class of symmetrical polyamines was designed and synthesized as potential small molecule CXCR4 antagonists. Among them, a representative compound 21 (namely HF50731) showed strong CXCR4 binding affinity (mean IC50 = 19.8 nM) in the CXCR4 competitive binding assay. Furthermore, compound 21 significantly inhibited SDF-1α-induced calcium mobilization and cell migration, and blocked HIV-1 infection via antagonizing CXCR4 coreceptor function. The structure-activity relationship analysis, site-directed mutagenesis, and molecular docking were conducted to further elucidate the binding mode of compound 21, suggesting that compound 21 could primarily occupy the minor subpocket of CXCR4 and partially bind in the major subpocket by interacting with residues W94, D97, D171, and E288. Our studies provide not only new insights for the fragment-based design of small molecule CXCR4 antagonists for clinical applications, but also a new and effective molecular probe for CXCR4-targeting biological studies.
- An, Jing,Fang, Xiong,Huang, Lina S.,Huang, Ziwei,Liang, Boqiang,Meng, Qian,Schooley, Robert T.,Wang, Juan,Xu, Yan,Zhang, Chaozai,Zhang, Huijun,Zhang, Xingquan,Zhu, Siyu
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supporting information
(2020/06/03)
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- Preparation technology of iopromide intermediate
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The invention provides an iopromide intermediate. A preparation technology of a compound 3-(2,3-dihydroxypropyl formamyl)-5-nitroisophthalic acid comprises the steps that monomethyl 5-nitroisophthalate is reacted with 3-amino propane-1,2-diol in alcohol solvent at appropriate heating temperature on the condition that strong alkali exists to obtain a product, wherein the reaction equation is shown in the specification. According to the preparation technology of the iopromide intermediate, the synthetic technology is good in selectivity, the synthetic route is simple, the product can be obtained through simple filtration, and the yield is high. Therefore, the technology has the advantages of being efficient, rapid and low in cost.
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Paragraph 0025
(2016/12/26)
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- Anticoagulant contrast media
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The present invention provides novel anticoagulant contrast agents, which comprise an organic scaffolding moiety, an organic anticoagulant moiety, and an imaging moiety. The invention also provides anticoagulant contrast media and methods of visualizing internal structures utilizing the novel anticoagulant contrast agents and anticoagulant contrast media.
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Page/Page column 15-16
(2010/02/15)
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- Nonacid nitration of benzenedicarboxylic and naphthalenecarboxylic acid esters
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When treated with nitrogen dioxide in the presence of ozone and a catalytic amount of iron(III) chloride in inert organic solvent at -10 to +5 °C, benzenedicarboxylic acid diesters 1, 4, and 6 underwent smooth nitration to give the corresponding mononitro derivatives 2/3, 5, and 7, respectively, in good yield (kyodai nitration). Naphthalenecarboxylic acid esters 8 and 11 and naphthalene-1,8-dicarboxylic acid diester 16 were similarly nitrated in the absence of catalyst to give the expected nitro compounds 9/10, 12-15, and 17-22, respectively. Different from conventional nitration based on the combined use of concentrated nitric and sulfuric acids, no hydrolytic cleavage of the ester function was observed under these conditions. The isomer distribution has been determined for the nitration of naphthalenecarboxylic acid esters 8, 11, and 16, and spectral data were collected for less common nitro derivatives. A unique changeover of the orientation mode observed in the kyodai nitration of diester 16, from the initial exclusive meta to the final meta/para, has been discussed in terms of the competition between the electrophilic substitution process involving the nitronium ion (NO2+) and the addition-elimination sequence involving the nitrogen trioxide radical (NO3).
- Nose,Suzuki,Suzuki
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p. 4356 - 4360
(2007/10/03)
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- Process for preparing di-C1 - C4 -alkyl 5-nitro-isophthalates
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Particularly pure di-C1 -C4 -alkyl 5-nitro-isophthalates are obtained in good yield and in a simple process by dissolving 5-nitro-isophthalic acid in a mixture of a C1 -C4 -alkyl alcohol and a solvent which is miscible or only partially miscible with water, heating in the presence of a strong acid, thus forming a second, aqueous phase, crystallizing out, after the esterification reaction has ended, the di-C1 -C4 -alkyl 5-nitro-isophthalate formed from the organic phase by cooling and removing the aqueous phase before or after the di-C1 -C4 -alkyl 5-nitro-isophthalate is separated off.
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- Ureylene naphthalene sulfonic acids
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Ureylenebis-symmetrical-phenenylbiscarbonylimino-substituted phenylenecarbonylimino-tetranaphthalenepolysulfonic acid benzoic acid salts, and nitro- and amino-substituted phenylenebiscarbonylimino-substituted benzamido-phenylenedicarbonyl-dinaphthalenepolysulfonic acid benzoic acid salts which are intermediates for the preparation of the active ureides which have complement inhibiting activity.
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- Phenenyltris(carbonylimino) multi-anionic substituted triphenyl acids and salts
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Phenenyltris(carbonylimino) multi-anionic substituted triphenyl acids and salts useful as complement inhibitors.
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