- Identification of structural features of 2-alkylidene-1,3-dicarbonyl derivatives that induce inhibition and/or activation of histone acetyltransferases KAT3B/p300 and KAT2B/PCAF
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Dysregulation of the activity of lysine acetyltransferases (KATs) is related to a variety of diseases and/or pathological cellular states; however, their role remains unclear. Therefore, the development of selective modulators of these enzymes is of paramount importance, because these molecules could be invaluable tools for assessing the importance of KATs in several pathologies. We recently found that diethyl pentadecylidenemalonate (SPV106) possesses a previously unobserved inhibitor/activator activity profile against protein acetyltransferases. Herein, we report that manipulation of the carbonyl functions of a series of analogues of SPV106 yielded different activity profiles against KAT2B and KAT3B (pure KAT2B activator, pan-inhibitor, or mixed KAT2B activator/KAT3B inhibitor). Among the novel compounds, a few derivatives may be useful chemical tools for studying the mechanism of lysine acetylation and its implications in physiological and/or pathological processes.
- Castellano, Sabrina,Milite, Ciro,Feoli, Alessandra,Viviano, Monica,Mai, Antonello,Novellino, Ettore,Tosco, Alessandra,Sbardella, Gianluca
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Read Online
- Synthesis of an Fe-Pd bimetallic catalyst for: N -alkylation of amines with alcohols via a hydrogen auto-transfer methodology
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Hydrogen auto-transfer (HAT) or borrowing hydrogen (BH) methodology which combines dehydrogenation, intermediate reaction and hydrogenation, is recognized as an excellent strategy for one-pot synthesis from an economic and environmental point of view. Although much effort has been made on the development of catalysts for HAT reactions, harsh conditions, external base or large amounts of noble metals are still required in most reported catalysis systems, and thus the exploration of a highly efficient and recyclable heterogeneous catalyst remains meaningful. In this work, a novel bimetallic catalyst, Fe10Pd1/NC500 derived from bimetallic MOF NH2-MIL-101(Fe10Pd1), has been prepared, and the catalyst exhibits superior catalytic performance for the N-alkylation of amines with alcohols via a hydrogen auto-transfer methodology. High yields of the desired products were achieved at 120 °C with an alcohol/amine molar ratio of 2?:?1 and required no external additive or solvent. A distinct enhancement in catalytic performance is observed when compared with monometallic catalysts, which can be ascribed to the "synergistic effects"inside the bimetallic alloys. The N-doped carbon support has been revealed to provide the necessary basicity which avoids the requirement of an external base. Moreover, a wide substrate range and remarkable reusability have been shown by Fe10Pd1/NC500, and this work highlights new possibilities for bimetallic catalysts applied in sustainable chemistry.
- Wu, Peng-Yu,Lu, Guo-Ping,Cai, Chun
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p. 396 - 404
(2021/01/28)
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- Rational Optimization of Lewis-Acid Catalysts for Direct Alcohol Amination, Part 2 – Titanium Triflimide as New Active Catalyst
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The reactivity of a new titanium triflimide salt (see Part 1) was investigated for the direct amination of alcohols. The combination of this new Lewis acid with pyridine-based ligands allowed a significant increase of activity. The scope of the reaction was increased compared to other Lewis-acid-based protocols. Finally, mechanistic insights based on EPR spectroscopy and DFT calculations are provided.
- Payard, Pierre-Adrien,Finidori, Céline,Guichard, Laurélia,Cartigny, Damien,Corbet, Matthieu,Khrouz, Lhoussain,Bonneviot, Laurent,Wischert, Raphael,Grimaud, Laurence,Pera-Titus, Marc
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supporting information
p. 3225 - 3228
(2020/06/08)
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- Method for synthesizing N-alkyl-N-aryl (methyl) acrylamide double-tail hydrophobic monomer
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The invention discloses a method for synthesizing an N-alkyl-N-aryl (methyl) acrylamide double-tail hydrophobic monomer. The method comprises the following steps: (1) putting alkylamine into a methanol solution with aromatic aldehyde, increasing the temperature till backflow, and performing a reaction over night; reducing the temperature of the mixed liquid to 5 DEG C or lower, adding a small amount of sodium borohydride for multiple times, removing an ice water bath, continuously performing a reaction for 30-120 minutes, and performing a backflow reaction for 3-6 hours; adding a certain amount of water to quench the reaction, drying an organic phase, and performing rotational evaporation so as to remove a solvent so as to obtain N-aryl-N-alkylamine; and (2) dissolving the N-aryl-N-alkylamine by using dichloromethane, adding a NaOH solution, slowly dropping a dichloromethane solution of (methyl) acryloyl chloride under a stirring condition of the ice water bath, performing heating to the room temperature, continuously performing a reaction for 2-12 hours, washing an organic layer till neutral by using distilled water, and further performing drying and rotational evaporation, so asto obtain N-alkyl-N-aryl (methyl) acrylamide. The method is gentle in reaction condition, short in reaction time, high in yield and applicable to large-scale industrial application.
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Paragraph 0023; 0024
(2019/10/01)
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- Manganese catalyzed reductive amination of aldehydes using hydrogen as a reductant
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A one-pot two-step procedure was developed for the alkylation of amines via reductive amination of aldehydes using molecular dihydrogen as a reductant in the presence of a manganese pyridinyl-phosphine complex as a pre-catalyst. After the initial condensation step, the reduction of imines formed in situ is performed under mild conditions (50-100 °C) with 2 mol% of catalyst and 5 mol% of tBuOK under 50 bar of hydrogen. Excellent yields (>90%) were obtained for a large combination of aldehydes and amines (40 examples), including aliphatic aldehydes and amino-alcohols.
- Wei, Duo,Bruneau-Voisine, Antoine,Valyaev, Dmitry A.,Lugan, No?l,Sortais, Jean-Baptiste
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p. 4302 - 4305
(2018/05/03)
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- Aryl-alkyl-lysines: Membrane-Active Fungicides That Act against Biofilms of Candida albicans
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Mortality due to pathogenic fungi has been exacerbated by the rapid development of resistance to frontline antifungal drugs. Fungicidal compounds with novel mechanisms of action are urgently needed. Aryl-alkyl-lysines, which are membrane-active small molecules, were earlier shown to be broad-spectrum antibacterial agents with potency in vitro and in vivo. Herein, we report the antifungal properties of aryl-alkyl-lysines. After identifying the most active compound (NCK-10), we tested its activity against a panel of clinically relevant pathogenic fungi and examined NCK-10's effect against immature and mature biofilms of Candida albicans. NCK-10 was capable of inhibiting the growth of various species of fungi (including Candida spp., Cryptococcus spp., and Aspergillus fumigatus) at concentrations similar to those of antifungal drugs used clinically. It was observed that polarization and permeability of the fungal cell membrane were compromised upon addition of NCK-10, indicating its mechanism is disruption of the fungal cell membrane. In addition to interfering with the growth of planktonic fungi, NCK-10 demonstrated the ability to both inhibit biofilm formation and reduce the metabolic activity of cells in C. albicans biofilm. Additionally, our compound was capable of crossing the blood-brain barrier in an in vitro model, expanding the potential antifungal applications for NCK-10. Overall, aryl-alkyl-lysines were found to be excellent compounds that warrant further investigation as novel antifungal agents.
- Ghosh, Chandradhish,Yadav, Vikas,Younis, Waleed,Mohammad, Haroon,Hegazy, Youssef A.,Seleem, Mohamed N.,Sanyal, Kaustuv,Haldar, Jayanta
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p. 293 - 301
(2017/04/21)
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- Method of producing higher amine (by machine translation)
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PROBLEM TO BE SOLVED: To provide a method of producing a secondary or tertiary higher amine. SOLUTION: The method of producing a higher amine comprises allowing a primary or secondary amine to react with an alcohol in the presence of at least one species of hydrogen halide selected from hydrogen chloride, hydrogen bromide and hydrogen iodide, or in the presence of a compound capable of producing a hydrogen halide (such as 1,3,5-triazo-2,4,6-triphosphorine-2,2,4,4,6,6-chloride). If the raw material amine is a primary amine, a secondary higher amine and a tertiary higher amine can be produced. If the raw material amine is a secondary amine, a tertiary higher amine can be produced. COPYRIGHT: (C)2012,JPO&INPIT
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Paragraph 0048; 0078
(2016/10/08)
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- CATALYST COMPOUNDS
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The present invention relates to an iridium-based catalyst compound for hydrogenating reducible moieties, especially imines and iminiums, the catalyst compounds being defined by the formulas: where ring B is either itself polycyclic, or ring B together with R is polycyclic. The catalysts of the invention are particularly effective in reductive amination procedures 10 which involve the in situ generation of the imine or iminium under reductive hydrogenative conditions.
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Paragraph 0314; 0327
(2015/03/28)
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- Reductive amination of aldehydes and amines with an efficient Pd/NiO catalyst
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By applying a simple Pd/NiO catalyst, the reductive amination of amines and aldehydes can progress efficiently under mild reaction conditions, and 24 substituted amines with different structures were synthesized with up to 98% isolated yields.
- Yang, Huimin,Cui, Xinjiang,Deng, Youquan,Shi, Feng
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supporting information
p. 1314 - 1322
(2014/04/17)
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- Nickel-catalysed reductive amination with hydrosilanes
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That's just silyl! Selective nickel-catalyzed reductive amination of aldehydes under hydrosilylation conditions is achieved by using a one pot, two step procedure. By using an insitu-generated catalyst (5mol%) from Ni(OAc)2 and tricyclohexylphosphine with tetramethyldisiloxane (TMDS) as the hydrosilane at 70°C, the corresponding secondary amines were obtained in moderate to good isolated yields.
- Zheng, Jianxia,Roisnel, Thierry,Darcel, Christophe,Sortais, Jean-Baptiste
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p. 2861 - 2864
(2013/10/21)
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- Fast reductive amination by transfer hydrogenation "on water"
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Reductive amination of various ketones and aldehydes by transfer hydrogenation under aqueous conditions has been developed, by using cyclometallated iridium complexes as catalysts and formate as hydrogen source. The pH value of the solution is shown to be critical for a high catalytic chemoselectivity and activity, with the best pH value being 4.8. In comparison with that in organic solvents, the reductive amination in an aqueous phase is faster, and the molar ratio of the substrate to the catalyst (S/C) can be set as high as 1×105, the highest S/C value ever reported in reductive amination reactions. The catalyst is easy to access and the reaction is operationally simple, allowing a wide range of ketones and aldehydes to react with various amines in high yields. The protocol provides a practical and environmental friendly new method for the synthesis of amine compounds. Greener amine synthesis: A versatile reductive amination protocol has been developed. By using an iridium catalyst in water, a broad range of ketones and aldehydes react with amines to afford various new amines in good yields (see scheme), with molar ratios of the substrate to the catalyst (S/C) as high as 1×10 5. The pH of the reaction solution plays a key role, regulating both the catalytic activity and the selectivity. Copyright
- Lei, Qian,Wei, Yawen,Talwar, Dinesh,Wang, Chao,Xue, Dong,Xiao, Jianliang
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supporting information
p. 4021 - 4029
(2013/04/10)
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- CATALYST COMPOUNDS
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The present invention relates to an iridium-based catalyst compound for hydrogenating reducible moieties, especially imines and iminiums, the catalyst compounds being defined by the formulas: where ring B is either itself polycyclic, or ring B together with R is polycyclic. The catalysts of the invention are particularly effective in reductive amination procedures 10 which involve the in situ generation of the imine or iminium under reductive hydrogenative conditions.
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Paragraph 00163; 00176
(2013/11/05)
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- Direct reductive amination of aldehydes using lithium-arene(cat.) as reducing system. A simple one-pot procedure for the synthesis of secondary amines
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A simple one-pot procedure for the direct reductive amination of aldehydes using lithium powder and a catalytic amount of 4,4′-di-tert-butylbiphenyl (DTBB) or a polymer supported naphthalene as reducing system is described. The direct reductive amination of a variety of aldehydes with primary amines was achieved simply by adding a mixture of the corresponding carbonyl compound and the amine, over a solution of the lithium arenide in THF at room temperature. For most of the substrates tested the main reaction products were the secondary amines along with variable amounts of the corresponding alcohol and/or imine products. Theoretical DFT calculations have been applied in order to explain the differences in reactivity observed for aromatic substrates.
- Nador, Fabiana,Moglie, Yanina,Ciolino, Andrés,Pierini, Adriana,Dorn, Viviana,Yus, Miguel,Alonso, Francisco,Radivoy, Gabriel
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experimental part
p. 3156 - 3160
(2012/08/08)
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- Amination of alcohols catalyzed by copper-aluminium Hydrotalcite: A green synthesis of amines
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Copper-aluminium hydrotalcite (CuAl-HT)/K2CO3 has been employed in the activation of various benzyl alcohols with benzylamines to afford the corresponding amines in good to high yields. Experimentation showed that the reaction takes place through sequential transformations: the oxidation of alcohols into carbonyl compounds, imine formation between amines and carbonyl compounds, and then reduction of imines to amines, heterogeneously catalyzed by non-noble Cu-Al HT catalyst in a one-pot and straightforward fashion. The process was further extended to amination of alcohols with anilines, which are often resistant to alkylation reactions when substituted with strong electron-withdrawing groups.
- Likhar, Pravin R.,Arundhathi, Racha,Kantam, Mannepalli Lakshmi,Prathima, Parvathaneni Sai
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experimental part
p. 5383 - 5389
(2010/02/28)
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- Preparation de nouveaux β-aminoacides a longue chaine et leur conversion en carboxybetaines bicatenaires F-alkylees
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The synthesis of amphoteric F-alkylated bitailed surfactants derived from new β-aminoacid intermediates is described. N-alkyl N-benzyl amines or N-alkyl N-methyl amines are added to acrylic acid. The β-amino acids obtained are quaternized by 2-F-alkyl ethyl acetates or thioacetate bromides to produce the F-alkylated double-chain carboxybetaines.
- Enjalbert,Bassilana,Krier,Szoenyi,Cambon
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p. 145 - 152
(2007/10/03)
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- Alkylbenzyldimethylammonium Salts as Inhibitors for the Ice Nucleating Activity of Erwinia ananas
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A variety of chemical compounds were examined as to their abilities to inhibit the ice nucleating activity of Erwinia ananas IN-10 cells and their outer membrane fraction.The nucleating activity of the outher membrane fraction was inhibited by many surface-active species among the compounds examined, whereas that of cells was inhibited only by amines and ammonium salts having amphiphilic structures.Ammonium salts with both an n-alkyl group having a carbon number of more than 8 and a benzyl group were particularly effective in inhibiting the nucleating activity of the bacterial cells.The inhibitory ability of one of the amphiphilic ammonium salts was greater at 15 deg C than at 4 deg C.When a tea plant was sprayed with one of the effective ammonium salts prior to being kept at -3 deg C overnight, it was possible to protect the plant from freeze-injury at the minimal concentration of 250 ppm.
- Watanabe, Michiko,Makino, Takahiro,Okada, Katsuhide,Hara, Morio,Watabe, Satoshi,Arai, Soichi
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p. 201 - 206
(2007/10/02)
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