- Designing an eEF2K-Targeting PROTAC small molecule that induces apoptosis in MDA-MB-231 cells
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Eukaryotic elongation factor 2 kinase (eEF2K) is a key α-kinase that negatively regulates the extension step of protein synthesis, which consumes most of the energy and amino acids required for protein synthesis. Studies have found that eEF2K protein is related to the breast cancer. However, existing inhibitor effect has not achieved the desired effect in cancer therapy. Proteolysis target chimeric (PROTAC) technology is uses proteasome to degrade target protein to achieve the purpose of inhibiting tumour cell growth. Here, we reported that the use of PROTAC strategy in combining with star eEF2K inhibitor A484954 and its potential derivatives. Consequently, candidate compound 11l was found to degrade eEF2K and induce apoptosis in human breast carcinoma MDA-MB-231 cells. Together, these findings demonstrate that our eEF2K-targeting PROTAC small molecule would be a potential new strategy for future breast cancer therapy.
- Liu, Yao,Zhen, Yongqi,Wang, Guan,Yang, Gaoxia,Fu, Leilei,Liu, Bo,Ouyang, Liang
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- Synthesis and Structure of 1-Substituted Semithioglycolurils
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Two methods for the synthesis of previously unavailable 1-substituted semithioglycolurils were developed. These methods consist of the cyclocondensation of 1-substituted ureas with 4,5-dihydroxy- or 4,5-dimethoxyimidazolidine-2-thione or glyoxal, followed by the reaction of the resulting 1-substituted 4,5-dihydroxyimidazolidine-2-ones with HSCN in a two-step one-pot procedure. Two of the desired semithioglycolurils were obtained as conglomerates.
- Baranov, Vladimir V.,Galochkin, Anton A.,Kravchenko, Angelina N.,Makhova, Nina N.,Nelyubina, Yulia V.
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p. 2563 - 2571
(2020/09/07)
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- A Straightforward Synthesis of N-Substituted Ureas from Primary Amides
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A direct and convenient method for the preparation of N-substituted ureas is achieved by treating primary amides with phenyliodine diacetate (PIDA) in the presence of an ammonia source (NH 3 or ammonium carbamate) in MeOH. The use of 2,2,2-trifluoroethanol (TFE) as the solvent increases the electrophilicity of the hypervalent iodine species and allows the synthesis of electron-poor carboxamides. This transformation involves a nucleophilic addition of ammonia on the isocyanate intermediate generated in situ by a Hofmann rearrangement of the starting amide.
- Franck, Xavier,Glachet, Thomas,Ibert, Quentin,Lohier, Jean-Fran?ois,Reboul, Vincent,Saraiva Rosa, Nathalie
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p. 2099 - 2105
(2020/07/13)
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- A Physical Organic Approach to Tuning Reagents for Selective and Stable Methionine Bioconjugation
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We report a data-driven, physical organic approach to the development of new methionine-selective bioconjugation reagents with tunable adduct stabilities. Statistical modeling of structural features described by intrinsic physical organic parameters was applied to the development of a predictive model and to gain insight into features driving the stability of adducts formed from the chemoselective coupling of oxaziridine and methionine thioether partners through Redox Activated Chemical Tagging (ReACT). From these analyses, a correlation between sulfimide stabilities and sulfimide ν (C=O) stretching frequencies was revealed. We exploited the rational gains in adduct stability exposed by this analysis to achieve the design and synthesis of a bis-oxaziridine reagent for peptide stapling. Indeed, we observed that a macrocyclic peptide formed by ReACT stapling at methionine exhibited improved uptake into live cells compared to an unstapled congener, highlighting the potential utility of this unique chemical tool for thioether modification. This work provides a template for the broader use of data-driven approaches to bioconjugation chemistry and other chemical biology applications.
- Christian, Alec H.,Jia, Shang,Cao, Wendy,Zhang, Patricia,Meza, Arismel Tena,Sigman, Matthew S.,Chang, Christopher J.,Toste, F. Dean
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supporting information
p. 12657 - 12662
(2019/09/04)
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- Metal-Free Ring-Expansion Reaction of Six-membered Sulfonylimines with Diazomethanes: An Approach toward Seven-Membered Enesulfonamides
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A new metal-free, ring-expansion reaction of six-membered N-sulfonylimines with unstable diazomethanes, generated in situ from the N-tosylhydrazones, has been developed. This reaction delivers valuable seven-membered enesulfonamides by a Tiffeneau-Demjanov rearrangement and intramolecular proton transfer tautomerization process. Moreover, this ring-expansion reaction can be carried out in a one-pot fashion and scaled up to the gram scale by using aryl aldehydes, without the need to isolate the N-tosylhydrazone. A diazo thing: The title reaction between cyclic N-sulfonylimines and diazo compounds generated in situ from the N-tosylhydrazones is simple and functional-group tolerant. It thus delivers valuable seven-membered sulfonamides in up to 95 % yield. Moreover, this reaction can be carried out in one-pot starting from the aryl aldehydes, without the need to isolate the N-tosylhydrazone (right).
- Xia, An-Jie,Kang, Tai-Ran,He, Long,Chen, Lian-Mei,Li, Wen-Ting,Yang, Jin-Liang,Liu, Quan-Zhong
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supporting information
p. 1441 - 1444
(2016/02/12)
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- An improved method for the preparation of alkyl/arylurea derivatives using chlorocarbonylsulfenyl chloride as carbonylating agent
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A convenient procedure has been developed for preparation of aminesubstituted or monomethylamine-substituted alkyl/arylurea derivatives. The method comprises two steps-reaction of an alkyl/aryl amine with chlorocarbonylsulfenyl chloride in a non-polar solvent to produce an alkyl/arylcarbonylsulfenyl chloride, then reaction of this alkyl/ arylcarbonylsulfenyl chloride with ammonia or monomethylamine in a two-phase reaction with a phase-transfer catalyst, to produce the corresponding alkyl/aryl-substituted urea. Springer Science+Business Media B.V. 2012.
- Manidhar,K. Uma Maheswara Rao,C. Suresh Reddy,Ch. Syamasunder,Adeppa,Misra, Krishna
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p. 2479 - 2489
(2013/03/13)
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- PROCESS FOR STRAIGHTENING KERATIN FIBRES WITH A HEATING MEANS AND DENATURING AGENTS
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The invention relates to a process for straightening keratin fibres, comprising: (i) a step in which a straightening composition containing at least two denaturing agents is applied to the keratin fibres, (ii) a step in which the temperature of the keratin fibres is raised, using a heating means, to a temperature of between 110 and 250° C.
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- Preparation of mono-, di-, and trisubstituted ureas by carbonylation of aliphatic amines with S,S-dimethyl dithiocarbonate
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General procedures are reported to prepare N-alkylureas, N,N′-dialkylureas (both symmetrical and unsymmetrical), and N,N,N′-trialkylureas by carbonylation of aliphatic amines, employing S,S-dimethyl dithiocarbonate (DMDTC) as a phosgene substitute. All reactions were carried out in water. Symmetrical disubstituted ureas were prepared directly working at 60°C with a molar ratio of DMDTC:amine = 1:2, preferably under nitrogen. Unsymmetrical ureas were prepared in two steps via S-methyl N-alkyl-thiocarbamate intermediates, which are formed selectively in the first step at room temperature. These intermediates react in the second step with ammonia or various aliphatic amines, both primary and secondary, at temperatures varying between 50 and 70°C. All the target ureas were obtained in high yields (28 examples, average yield 94%) and with very high purity (generally >99.2%). Also to be noted is the recovery of a co-product of industrial interest, methanethiol, in an amount of two moles for each mole of DMDTC, with complete exploitation of the reagent. Georg Thieme Verlag Stuttgart.
- Artuso, Emma,Degani, Iacopo,Fochi, Rita,Magistris, Claudio
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p. 3497 - 3506
(2008/09/19)
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- Process to prepare alkyl-ureas from O,S-dimethyl dithiocarbonate
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The present invention relates to the preparation of alkyl-ureas, starting from O,S-dimethyl dithiocarbonate, which provides the following steps: A) causing the O,S-dimethyl dithiocarbonate to react with a primary amine of general formula R1NH2in order to obtain an O-methyl thiocarbamate; B) isomerising the O-methyl thiocarbamate in order to obtain an S-methyl thiocarbamate; C) causing the S-methyl thiocarbamate with a compound of general formula R′R″NH, wherein R′ and R″ may be equal or different one in respect of the other and of R1and may be H, R2or R3, in order to obtain one of the alkyl-ureas of formula (4), (5) or (6).
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Page column 7-8
(2010/02/06)
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- Process to prepare alkyl-ureas from O,S-dimethyl dithiocarbonate
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The present invention relates to the preparation of alkyl-ureas, starting from O,S-dimethyl dithiocarbonate, which provides the following steps:A) causing the O,S-dimethyl dithiocarbonate to react with a primary amine of general formula R1NH2 in order to obtain an O-methyl thiocarbamate;B) isomerising the O-methyl thiocarbamate in order to obtain an S-methyl thiocarbamate;C) causing the S-methyl thiocarbamate with a compound of general formula R'R"NH, wherein R' and R" may be equal or different one in respect of the other and of R1 and may be H, R2 or R3, in order to obtain one of the alkyl-ureas of formula (4), (5) or (6).
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- Cyanoacetamido-derivatives having a fungicidal activity
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A method of fighting fungus infections by using compounds having the formula: STR1 wherein: R is H, a C1 -C4 alkyl, an alkenyl, or an alkynyl radical; n is 1 or 2; A represents a C1 -C6 alkylene bridge, an arylene or a heterocyclic bridge; X represents O, S, SO, SO2 ; and R1 is selected from the group consisting of C1 -C6 alkyl radicals, a phenyl radical, optionally substituted, polyfluoroalkyl radicals containing from 1 to 4 carbon atoms and at least 2 fluorine atoms, polyfluoroalkenyl radicals containing from 2 to 4 carbon atoms and at least 2 fluorine atoms, but excluding compounds having the formula (I) wherein A is an alkylene radical, n is 2, and R1 is a C1 -C6 alkyl radical.
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- Organic compounds substituted heptadeca-5,9- and 5,10-dienoic acid
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The present invention provides novel substituted heptadeca-5,9- and 5,10-dienoic acid and similar fatty acid compounds which are derivatives of certain prostaglandins and are potent thromboxane A2 inhibitors. By virtue of this pharmacological property, they represent useful pharmacological agents for a wide variety of purposes.
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