- Nanostructured RuO2 on MWCNTs: Efficient catalyst for transfer hydrogenation of carbonyl compounds and aerial oxidation of alcohols
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Multiwall carbon nanotubes (MWCNTs)/ruthenium dioxide nanoparticles (RuO2NPs) composite was prepared by a straightforward 'dry synthesis' method. After being well characterized, the prepared composite was used as a nanocatalyst (RuO2/MWCNT) for the transfer hydrogenation of carbonyl compounds. The excellent adhesion of RuO2NPs on the anchoring sites of MWCNTs was confirmed by TEM and Raman analyses. The weight percentage (7.97 wt%) and the chemical state (+4) of Ru in RuO2/MWCNT was confirmed by EDS and XPS analyses, respectively. It was found that the RuO2/MWCNT has a higher specific surface area of 189.3 m2 g-1. Initially the reaction conditions were optimized and then the scope of the catalytic system was extended with a wide range of carbonyl compounds. The influence of the size of RuO2NPs on the transfer hydrogenation of carbonyl compounds was also studied. The RuO2/MWCNT is highly chemoselective, heterogeneous in nature, reusable and highly stable. Owing to the high stability of the used catalyst (u-RuO2/MWCNT), it was further calcinated at high temperature to obtain RuO2 nanorods (NRs) hybrid MWCNTs. Then the hybrid material was used as a catalyst (r-RuO 2/MWCNT) for the aerial oxidation of alcohols and the result was found to be good.
- Gopiraman,Babu, S. Ganesh,Karvembu,Kim
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- Synthesis and Evaluation of Indole-Based Autoinducers on Quorum Sensing in Vibrio cholerae
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Vibrio cholerae (V. cholerae) uses the autoinducer CAI-1 (cholera autoinducer 1) and several linked quorum sensing systems in order to efficiently sense its ever-changing environment and optimally coordinate population-wide gene expression. Indole has been reported as an important signal that is sensed by V. cholerae, and here, we report the synthesis and evaluation of a focused library of synthetic indole-CAI-1 derivatives as tools to probe quorum sensing (QS) in this human pathogen. Our results show interesting and diverging effects for several conjugates, as compared to CAI-1, on virulence factor production and biofilm formation.
- Holoidovsky, Lara,Meijler, Michael M.
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- Practical Chemoselective Acylation: Organocatalytic Chemodivergent Esterification and Amidation of Amino Alcohols with N-Carbonylimidazoles
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Chemoselective transformations are a cornerstone of efficient organic synthesis; however, achieving this goal for even simple transformations, such as acylation reactions, is often a challenge. We report that N-carbonylimidazoles enable catalytic chemodivergent aniline or alcohol acylation in the presence of pyridinium ions or 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), respectively. Both acylation reactions display high and broad chemoselectivity for the target group. Unprecedented levels of chemoselectivity were observed in the DBU-catalyzed esterification: A single esterification product was obtained from a molecule containing primary aniline, alcohol, phenol, secondary amide, and N?H indole groups. These acylation reactions are highly practical as they involve only readily available, inexpensive, and relatively safe reagents; can be performed on a multigram scale; and can be used on carboxylic acids directly by in situ formation of the acylimidazole electrophile.
- Nelson, Hope,Richard, William,Brown, Hailee,Medlin, Abigail,Light, Christina,Heller, Stephen T.
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supporting information
p. 22818 - 22825
(2021/09/13)
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- SMALL MOLECULE INHIBITORS OF IL-6 AND USES THEREOF
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In one aspect, the invention relates to substituted 2-(lH-indol-3-yl)ethanol analogs and substituted 3,3a,8,8a-tetrahydro-2H-furo[2,3-b]indole analogs, derivatives thereof, and related compounds, which are useful as inhibitors of IL-6 mediated activation of the Jak2/STAT3 pathway; synthetic methods for making the compounds; pharmaceutical compositions comprising the compounds; and methods of treating disorders of uncontrolled cellular proliferation associated with a IL6 dysfunction using the compounds and compositions. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.
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Paragraph 00698
(2013/03/26)
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- General and highly efficient iron-catalyzed hydrogenation of aldehydes, ketones, and α,β-unsaturated aldehydes
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EnvIRONmentally friendly: The title hydrogenation of aldehydes, ketones, and α,β-unsaturated aldehydes is reported. In the presence of the catalyst 1, primary, secondary, and allylic alcohols were obtained in good to excellent yields under mild reaction conditions. The catalyst is easily and inexpensively prepared, and is also stable to air, water, and column chromatography. Copyright
- Fleischer, Steffen,Zhou, Shaolin,Junge, Kathrin,Beller, Matthias
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p. 5120 - 5124
(2013/06/27)
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- Discrete iron complexes for the selective catalytic reduction of aromatic, aliphatic, and α,β-unsaturated aldehydes under water-gas shift conditions
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Iron-catalyzed reductions: Selective iron-catalyzed reduction of aldehydes with hydrogen generated in situ by the water-gas shift reaction is presented (see scheme). The generality and selectivity of this mild procedure are demonstrated by the efficient reduction of various aromatic, aliphatic and α,β-unsaturated aldehydes.
- Tlili, Anis,Schranck, Johannes,Neumann, Helfried,Beller, Matthias
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p. 15935 - 15939
(2013/02/21)
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- INDOLYL-PYRIDONE DERIVATIVES
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Compounds of formula (I) are inhibitors of Chk1, useful in the treatment of, inter alia, cancers: wherein R1, R2, R5 and R6 are independently selected from hydrogen, hydroxy, methyl, trifluoromethyl, hydroxy methyl, methoxy, trifluoromethoxy, methylamino and dimethylamino; R3, and R4 are independently selected from hydrogen, hydroxy, C1-C3 alkyl, fluoro-(C1-C3)-alkyl, hydroxy-(C1-C3)-alkyl, C1-C3 alkoxy, fluoro-(C1-C3)-alkoxy, hydroxy-(C1-C3)-alkoxy, -N(R11)-R12, -AIk-N(R11)-R12, -0-AIk-N(R11)-R12, -C(=O)OH, carboxy-(C1-C3)-alkyl, or -C(=O)-NH-R13; AIk is a straight or branched chain divalent C1-C6 alkylene radical; R7 and R8 are independently selected from hydrogen, hydroxy, or C1-C3 alkoxy; X is a straight chain divalent C1-C3 alkylene radical, optionally substituted on one or more carbons by R9 and/or R10; W is selected from -C(=O)-N(-R16)- or -N(-R17)-C(=O)-; Y is hydrogen, C1-C3 alkyl, C1-C3 alkoxy, or halo; and Q is an optionally substituted 5-membered monocyclic heteroaryl ring.
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Page/Page column 20; 27; 28
(2011/02/24)
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- INDOLYL- PYRIDONE DERIVATIVES HAVING CHECKPOINT KINASE 1 INHIBITORY ACTIVITY
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Compounds of formula (I) have checkpoint kinase 1 (CHK1 ) inhibitory activity: wherein R1, R2, R5 and R6 are independently selected from hydrogen, hydroxy, methyl, trifluoromethyl, hydroxymethyl, methoxy, triflu
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Page/Page column 26; 65
(2009/09/05)
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- Discovery of 4-amino and 4-hydroxy-1-aroylindoles as potent tubulin polymerization inhibitors
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1-Aroylindoline, 1-aroyl-1,2,3,4-tetrahydroquinoline, and 1-aroylindole derivatives were synthesized and evaluated for anticancer activity. The 4-amino and 4-hydroxy-1-aroylindoles 26 and 27 with IC50 of 0.9 and 0.6 μM, respectively, exhibited
- Liou, Jing-Ping,Wu, Zi-Yi,Kuo, Ching-Chuan,Chang, Chi-Yen,Lu, Pei-Yi,Chen, Chi-Ming,Hsieh, Hsing-Pang,Chang, Jang-Yang
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scheme or table
p. 4351 - 4355
(2009/05/26)
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- IDENTIFICATION OF COMPOUNDS SUITABLE FOR TREATING AD
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The invention provides a method of screening for compounds which inhibit the hyperphosphorylation of tau, and hence are suitable for treating AD and related conditions.
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Page/Page column 13-14
(2008/06/13)
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- The discovery and preparation of disubstituted novel amino-aryl-piperidine- based renin inhibitors
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Recently, trans-disubstituted oxo-aryl-piperidines have been identified as small molecule nonpeptide renin inhibitors for the modulation of hypertension. Herein, we report on the discovery and preparation of a new class of novel cis-disubstituted amino-aryl-piperidines as a mixture of enantiomers that are potent in vitro renin inhibitors and also, possess in vivo antihypertensive activity in a double transgenic mouse model.
- Cody, Wayne L.,Holsworth, Daniel D.,Powell, Noel A.,Jalaie, Mehran,Zhang, Erli,Wang, Wei,Samas, Brian,Bryant, John,Ostroski, Robert,Ryan, Michael J.,Edmunds, Jeremy J.
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- Indolinone compounds as kinase inhibitors
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The invention relates to certain indolinone compounds, their method of synthesis, and a combinatorial library consisting of the indolinone compounds of the invention. The invention also relates to methods of modulating the function of protein kinases using indolinone compounds of the invention and methods of treating diseases by modulating the function of protein kinases and related signal transduction pathways.
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Page/Page column 84
(2010/11/30)
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- Tyrosine kinase inhibitors
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The present invention relates to compounds which inhibit, regulate and/or modulate tyrosine kinase signal transduction, compositions which contain these compounds, and methods of using them to treat tyrosine kinase-dependent diseases and conditions, such as angiogenesis, cancer, tumor growth, atherosclerosis, age related macular degeneration, diabetic retinopathy, inflammatory diseases, and the like in mammals.
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- SYNTHESIS OF SOME 5-SUBSTITUTED INDOLES
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A halogen-metal exchange strategy was employed to prepare several 5-substituted indoles from 5-bromoindole.Additional derivatives were elaborated from the formyl, acetyl, thiomethyl, boronic acid and trimethylstannyl analogues thus prepared.
- Yang, Youhua,Martin, Arnold R.,Nelson, David L.,Regan, John
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p. 1169 - 1175
(2007/10/02)
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- Alpha-aminoacyl-penicillins and cephalosporins
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Antibacterially active and animal growth-regulating novel β-lactam compounds of the formula STR1 in which R1 represents an optionally substituted radical of the formula STR2 Z represents oxygen, sulphur or --N--R13, and A represents
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- The Chemistry of Indoles. XXXIII. Substituent Effect in Regioselective Metalation of 3-Indolecarbaldehyde and Syntheses of Indoles Carrying a Carbon Side Chain at the 4-, 5-, 6-, or 7-Position
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The nature of a substituent on the pyrrole ring of 3-indolecarbaldehyde plays a significant role in governing the regioselectivity of metalation.To confirm the structures of the products, various indoles carrying a carbon side chain at the 4-, 5-, 6-, or 7-position were prepared by other methods.Synthesis of 5-substituted 1-hydroxyindoles is also described.Keywords-thallation; mercuration; 4-substituted indole; 5-substituted indole; 6-substituted indole; 7-substituted indole; regioselective metalation; 3-indolecarbaldehyde; thallation-palladation; 1-hydroxyindole
- Somei, Masanori,Saida, Yoshihiro,Komura, Naoko
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p. 4116 - 4125
(2007/10/02)
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