34 research outputs found

    Remarkable influence of substituent in ionic liquid in control of reaction: simple, efficient and hazardous organic solvent free procedure for the synthesis of 2-aryl benzimidazoles promoted by ionic liquid, [pmim]BF<SUB>4</SUB>

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    A simple and efficient procedure for the synthesis of 2-substituted benzimidazoles has been developed by a one-pot reaction of o-phenylenediamine with aromatic aldehydes in the presence of an ionic liquid, 1-methyl-3-pentylimidazolium tetrafluoroborate, [pmim]BF<SUB>4</SUB> at room temperature in open air without any organic solvent. The ionic liquid is recycled. A remarkable influence of the substituent on the imidazolium unit of the ionic liquid on the outcome of the reaction is observed

    LMDIPred: A web-server for prediction of linear peptide sequences binding to SH3, WW and PDZ domains.

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    Protein-peptide interactions form an important subset of the total protein interaction network in the cell and play key roles in signaling and regulatory networks, and in major biological processes like cellular localization, protein degradation, and immune response. In this work, we have described the LMDIPred web server, an online resource for generalized prediction of linear peptide sequences that may bind to three most prevalent and well-studied peptide recognition modules (PRMs)-SH3, WW and PDZ. We have developed support vector machine (SVM)-based prediction models that achieved maximum Matthews Correlation Coefficient (MCC) of 0.85 with an accuracy of 94.55% for SH3, MCC of 0.90 with an accuracy of 95.82% for WW, and MCC of 0.83 with an accuracy of 92.29% for PDZ binding peptides. LMDIPred output combines predictions from these SVM models with predictions using Position-Specific Scoring Matrices (PSSMs) and string-matching methods using known domain-binding motif instances and regular expressions. All of these methods were evaluated using a five-fold cross-validation technique on both balanced and unbalanced datasets, and also validated on independent datasets. LMDIPred aims to provide a preliminary bioinformatics platform for sequence-based prediction of probable binding sites for SH3, WW or PDZ domains

    Copper nano-catalyst: sustainable phenyl-selenylation of aryl iodides and vinyl bromides in water under ligand free conditions

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    A simple and efficient procedure for the synthesis of aryl- and vinyl-selenides has been developed by a copper nanoparticle catalysed reaction of aryl iodide/vinyl bromide with diphenyl diselenide in the presence of zinc in water. (E)-Vinyl bromides produce (E)-vinyl selenides stereoselectively, whereas (Z)-vinyl bromides provide mixtures of (E) and (Z) isomers. The catalyst was recycled

    A simple and efficient one-pot synthesis of substituted benzo[b]furans by Sonogashira coupling-5-endo-dig cyclization catalyzed by palladium nanoparticles in water under ligand- and copper-free aerobic conditions

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    A simple and efficient procedure for the synthesis of 2-substituted benzo[b]furan derivatives has been developed by the reaction of 2-iodophenols and arylacetylenes in water catalyzed by palladium nanoparticles generated in situ in open air. The reaction does not require any additive, ligand, or co-catalyst. The reaction occurs through Sonogashira coupling of 2-iodophenols with phenylacetylenes followed by 5-endo-dig cyclization. A series of functionalized benzo[b]furan derivatives was obtained in high yields by this procedure

    Green recyclable supported-metal catalyst for useful organic transformations

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    One of the major challenges confronted by modern chemists is the development of sustainable chemistry to maintain environmental chastity. With this perspective in mind, heterogeneous organometallic chemistry has been intensively investigated in recent times. The advantages offered by the heterogeneous catalysts are ease of separation of product, reusability of the catalyst, improved efficiency, eco-compatibility and economic feasibility. This review focuses on the application of heterogeneous catalysis in different synthetic approaches. The review consists of six units namely, palladium mediated reactions, copper mediated reactions, ruthenium mediated reactions, rhodium mediated reactions, multimetallic catalytic systems and supported catalysts for asymmetric transformations, which cover almost all sorts of latest developments in organic transformations promoted by immobilized transition metal catalysts. The discussion not only involves the illustration of efficiency and reusability but also highlights the scope and limitations associated with the supported catalytic systems from a green chemistry standpoint

    Palladium(0) nanoparticles-catalyzed ligand-free direct arylation of benzothiazole via C-H bond functionalization

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    Palladium nanoparticles, generated in situ efficiently catalyzes direct 2-C-H arylation of benzothiazole without requirement of any ligand. A wide range of substituted aryl and heteroaryl iodides participate in this reaction producing a series of 2-aryl/heteroaryl-benzothiazoles in high yields

    Aerobic ligand-free Suzuki coupling catalyzed by in situ-generated palladium nanoparticles in water

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    A simple and efficient procedure for Suzuki coupling of aryl bromides/iodides with aryl- and alkylboronic acids catalyzed by in situ-generated palladium(0) nanoparticles in water without any ligand in open air to produce a variety of functionalized biaryls and alkyl-aryls has been developed. The boronic acids act here as the reducing agent for the formation of Pd nanoparticles. The reactions are remarkably fast (5 min) and high yielding. The catalyst is recyclable up to three runs without loss of efficiency

    Performance of RES method for different domain binding peptide classes on respective unbalanced datasets.

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    <p>Performance of RES method for different domain binding peptide classes on respective unbalanced datasets.</p
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