- Monitoring intracellular pH fluctuation with an excited-state intramolecular proton transfer-based ratiometric fluorescent sensor
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Intracellular pH is a key parameter related to various biological and pathological processes. In this study, a ratiometric pH fluorescent sensor ABTT was developed harnessing the amino-type excited-state intramolecular proton transfer (ESIPT) process. Relying on whether the ESIPT proceeds normally or not, ABTT exhibited the yellow fluorescence in acidic media, or cyan fluorescence in basic condition. According to the variation, ABTT behaved as a promising sensor which possessed fast and reversible response to pH change without interference from the biological substances, and exported a steady ratiometric signal (I478/I546). Moreover, due to the ESIPT effect, large Stokes shift and high quantum yield were also exhibited in ABTT. Furthermore, ABTT was applied for monitoring the pH changes in living cells and visualizing the pH fluctuations under oxidative stress successfully. These results elucidated great potential of ABTT in understanding pH-dependent physiological and pathological processes.
- Feng, Bin,Zhu, Yingli,Wu, Jiaxin,Huang, Xueyan,Song, Rong,Huang, Liu,Feng, Xueping,Zeng, Wenbin
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supporting information
p. 3057 - 3060
(2021/04/12)
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- Studies on Iron-Catalyzed Aerobic Oxidation of Benzylic Alcohols to Carboxylic Acids
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A comprehensive study on aerobic oxidation of benzylic alcohols to carboxylic acids with a catalytic amount each of Fe(NO 3) 3 ·9H 2 O, TEMPO, and KCl is conducted. Various synthetically useful functional groups are well tolerated in the reaction. Distinct electronic and steric effects are observed in the reaction: electron-withdrawing groups accelerate the reaction while electron-donating groups make the reaction slower, and ortho -substituted substrates react slower than meta -substituted substrates. Several large-scale reactions (100 mmol) are conducted using a slow air flow of 30 mL/min to demonstrate the practicality of this method in an academic laboratory.
- Jiang, Xingguo,Ma, Shengming
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p. 1629 - 1639
(2018/02/26)
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- Preparation method of anticoagulation drug intermediate 5-methoxy-2-nitrobenzoic acid
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The invention discloses a preparation method of an anticoagulation drug intermediate 5-methoxy-2-nitrobenzoic acid and belongs to the field of drug intermediate synthesis. Cheap 3-drug intermediate serves as a raw material, a nitratlon reaction is selectively carried out at proper temperature to synthesize 5-chloro-2-nitrobenzoic acid, methyl alcohol is used for carrying out a substitution reaction on chlorine under the effect of alkali, and the needed intermediate 5-methoxy-2-nitrobenzoic acid is obtained. The preparation method which has short steps, simple reactions and low cost and can achieve stable industrial production is provided for a key intermediate of an anticoagulation drug Betrixaban.
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Paragraph 0025
(2017/08/28)
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- Synthesis of novel quinazolinone derivatives with methyl (E)-2-(3-methoxy)acrylate moiety
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A new series of quinazolinone derivatives with methyl (E)-2-(3-methoxy) acrylate moiety have been designed and synthesized. All target compounds had been identified by 1H NMR spectrum, IR spectrum and HR-MS (high resolution mass spectrum). Three target compounds (10a, 10e, 10h) were chosen to preliminarily test the antibacterial activities, the results showed that all three target compounds exhibited antibacterial activities against three bacterial strains (Proteobacteria, Salmonella, Colibacillus).
- Dong, Kui-Kui,Zhou, Hua-Hong,Guo, A-Rong,Chen, Tian,Wang, Yu-Liang
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p. 1039 - 1042
(2013/05/08)
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- INHIBITORS OF STEAROYL-COA DESATURASE
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Provided herein are compounds of the formula (I): as well as pharmaceutically acceptable salts thereof, wherein the substituents are as those disclosed in the specification. These compounds, and the pharmaceutical compositions containing them, are useful for the treatment of diseases such as, for example, obesity.
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- Process for the production of nitro derivatives of aromatic compounds
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Nitroderivates of aromatic compounds which are difficult to nitrate, can readily be obtained by nitration providing that the aromatic compound is treated with nitric acid or another nitrating agent in the presence of aliphatic or cycloaliphatic hydrocarbons monosubstituted or polysubstituted by halogen, the nitro group or an alkyl sulphonyl group, and the nitro derivative formed subsequently isolated.
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- 1,2,3-Benzotriazin-4-ones and related systems. Part II. Thermolytic decomposition of substituted 1,2,3-benzotriazin-4-ones and isatoic anhydrides
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Several nuclear-substituted 1,2,3-benzotriazin-4-ones have been thermolysed in an inert solvent. In each case the major identifiable product proved to be a 2-(o-aminophenyl)-3,1-benzoxazin-4-one. Nuclear-substituted isatoic anhydrides on thermolysis behaved similarly.
- Archer, John G.,Barker, Alan J.,Smalley, Robert K.
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p. 1169 - 1173
(2007/10/06)
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