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Journal articles on the topic 'C-c bond forming processes'

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Published: 18 May 2024

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1

Martín, Cristina del Mar García, José Ignacio Hernández García, Sebastián Bonardd, and David Díaz Díaz. "Lignin-Based Catalysts for C–C Bond-Forming Reactions." Molecules 28, no. 8 (2023): 3513. http://dx.doi.org/10.3390/molecules28083513.

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Carbon–carbon (C–C) bond formation is the key reaction in organic synthesis to construct the carbon framework of organic molecules. The continuous shift of science and technology toward eco-friendly and sustainable resources and processes has stimulated the development of catalytic processes for C–C bond formation based on the use of renewable resources. In this context, and among other biopolymer-based materials, lignin has attracted scientific attention in the field of catalysis during the last decade, either through its acid form or as a support for metal ions and metal nanoparticles that d

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2

Valdés, Carlos, Raquel Barroso, and María Cabal. "Pd-catalyzed Auto-Tandem Cascades Based on N-Sulfonylhydrazones: Hetero- and Carbocyclization Processes." Synthesis 28, no. 19 (2017): 4434–47. http://dx.doi.org/10.1055/s-0036-1588535.

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The Pd-catalyzed cross-coupling between N-tosylhydrazones and organic halides is a powerful method for the creation of C–C bonds. This transformation has been included recently in cascade processes in which the same catalyst promotes various independent catalytic steps, a process known as auto-tandem catalysis. This strategy proves to be very useful for the construction of relatively complex carbo- and heterocyclic structures, as well as for the generation of molecular diversity. This short review will cover the different Pd-catalyzed auto-tandem reactions involving N-tosylhydrazones organize

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3

Liu, Jialin, Xiaoyu Xiong, Jie Chen, Yuntao Wang, Ranran Zhu, and Jianhui Huang. "Double C–H Activation for the C–C bond Formation Reactions." Current Organic Synthesis 15, no. 7 (2018): 882–903. http://dx.doi.org/10.2174/1570179415666180720111422.

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Background: Among the numerous bond-forming patterns, C–C bond formation is one of the most useful tools for building molecules for the chemical industry as well as life sciences. Recently, one of the most challenging topics is the study of the direct coupling reactions via multiple C–H bond cleavage/activation processes. A number of excellent reviews on modern C–H direct functionalization have been reported by Bergman, Bercaw, Yu and others in recent years. Among the large number of available methodologies, Pdcatalyzed reactions and hypervalent iodine reagent mediated reactions represent the

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4

Todd, David P., Benjamin B. Thompson, Alex J. Nett, and John Montgomery. "Deoxygenative C–C Bond-Forming Processes via a Net Four-Electron Reductive Coupling." Journal of the American Chemical Society 137, no. 40 (2015): 12788–91. http://dx.doi.org/10.1021/jacs.5b08448.

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5

Correa, Arkaitz, та Marcos Segundo. "Cross-Dehydrogenative Coupling Reactions for the Functionalization of α-Amino Acid Derivatives and Peptides". Synthesis 50, № 15 (2018): 2853–66. http://dx.doi.org/10.1055/s-0037-1610073.

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The functionalization of typically unreactive C(sp3)–H bonds holds great promise for reducing the reliance on existing functional groups while improving atom-economy and energy efficiency. As a result, this topic is a matter of genuine concern for scientists in order to achieve greener chemical processes. The site-specific modification of α-amino acid and peptides based upon C(sp3)–H functionalization still represents a great challenge of utmost synthetic importance. This short review summarizes the most recent advances in ‘Cross-Dehydrogenative Couplings’ of α-amino carbonyl compounds and pep

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6

Daoust, Benoit, Nicolas Gilbert, Paméla Casault, François Ladouceur, and Simon Ricard. "1,2-Dihaloalkenes in Metal-Catalyzed Reactions." Synthesis 50, no. 16 (2018): 3087–113. http://dx.doi.org/10.1055/s-0037-1610174.

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1,2-Dihaloalkenes readily undergo simultaneous or sequential difunctionalization through transition-metal-catalyzed reactions, which makes them attractive building blocks for complex unsaturated motifs. This review summarizes recent applications of such transformations in C–C and C–heteroatom bond forming processes. The facile synthesis of stereodefined alkene derivatives, as well as aromatic and heteroatomic compounds, from 1,2-dihaloalkenes is thus outlined.1 Introduction2 Synthesis of 1,2-Dihaloalkenes3 C–C Bond Forming Reactions4 C–Heteroatom Bond Forming Reactions5 Conclusion

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7

Todd, David P., Benjamin B. Thompson, Alex J. Nett, and John Montgomery. "ChemInform Abstract: Deoxygenative C-C Bond-Forming Processes via a Net Four-Electron Reductive Coupling." ChemInform 47, no. 12 (2016): no. http://dx.doi.org/10.1002/chin.201612061.

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8

Buzzetti, Luca, Alexis Prieto, Sudipta Raha Roy, and Paolo Melchiorre. "Radical-Based C−C Bond-Forming Processes Enabled by the Photoexcitation of 4-Alkyl-1,4-dihydropyridines." Angewandte Chemie 129, no. 47 (2017): 15235–39. http://dx.doi.org/10.1002/ange.201709571.

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9

Buzzetti, Luca, Alexis Prieto, Sudipta Raha Roy, and Paolo Melchiorre. "Radical-Based C−C Bond-Forming Processes Enabled by the Photoexcitation of 4-Alkyl-1,4-dihydropyridines." Angewandte Chemie International Edition 56, no. 47 (2017): 15039–43. http://dx.doi.org/10.1002/anie.201709571.

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10

Buchspies, Jonathan, Md Mahbubur Rahman, and Michal Szostak. "Transamidation of Amides and Amidation of Esters by Selective N–C(O)/O–C(O) Cleavage Mediated by Air- and Moisture-Stable Half-Sandwich Nickel(II)–NHC Complexes." Molecules 26, no. 1 (2021): 188. http://dx.doi.org/10.3390/molecules26010188.

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The formation of amide bonds represents one of the most fundamental processes in organic synthesis. Transition-metal-catalyzed activation of acyclic twisted amides has emerged as an increasingly powerful platform in synthesis. Herein, we report the transamidation of N-activated twisted amides by selective N–C(O) cleavage mediated by air- and moisture-stable half-sandwich Ni(II)–NHC (NHC = N-heterocyclic carbenes) complexes. We demonstrate that the readily available cyclopentadienyl complex, [CpNi(IPr)Cl] (IPr = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene), promotes highly selective transa

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11

Gray, Vincent James, and Jonathan D. Wilden. "The chemistry of ynol and thioynol ethers." Organic & Biomolecular Chemistry 14, no. 41 (2016): 9695–711. http://dx.doi.org/10.1039/c6ob01776b.

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12

McNally, Andrew, Ryan Dolewski, and Michael Hilton. "4-Selective Pyridine Functionalization Reactions via Heterocyclic Phosphonium Salts." Synlett 29, no. 01 (2017): 08–14. http://dx.doi.org/10.1055/s-0036-1591850.

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Pyridines are widely used across the chemical sciences in applications ranging from pharmaceuticals, ligands for metal complex and battery technologies. Direct functionalization of pyridine C–H bonds is an important strategy to make useful pyridine derivatives, but there are few ways to selectively transform the 4-position of the scaffold. We recently reported that pyridines can be converted into heterocyclic phosphonium salts that can serve as generic handles for multiple subsequent bond-forming processes. Reactions with nucleophiles and transition-metal cross-couplings will be described to m

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13

Chiummiento, Lucia, Rosarita D’Orsi, Maria Funicello, and Paolo Lupattelli. "Last Decade of Unconventional Methodologies for the Synthesis of Substituted Benzofurans." Molecules 25, no. 10 (2020): 2327. http://dx.doi.org/10.3390/molecules25102327.

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This review describes the progress of the last decade on the synthesis of substituted benzofurans, which are useful scaffolds for the synthesis of numerous natural products and pharmaceuticals. In particular, new intramolecular and intermolecular C–C and/or C–O bond-forming processes, with transition-metal catalysis or metal-free are summarized. (1) Introduction. (2) Ring generation via intramolecular cyclization. (2.1) C7a–O bond formation: (route a). (2.2) O–C2 bond formation: (route b). (2.3) C2–C3 bond formation: (route c). (2.4) C3–C3a bond formation: (route d). (3) Ring generation via in

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14

Youn, So Won. "Transition-Metal-Catalyzed Annulative Coupling Cascade for the Synthesis of 3-Methyleneisoindolin-1-ones." Synthesis 52, no. 06 (2020): 807–18. http://dx.doi.org/10.1055/s-0039-1690046.

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This short review describes the recent progress made on transition-metal-catalyzed annulative couplings for the synthesis of 3-methyleneisoindolin-1-ones, which are useful intermediates for the synthesis of numerous alkaloids and can be often found in a wide range of natural products and pharmaceuticals. In particular, new one-pot multiple C–C/C–N bond-forming processes for the construction of the 5-methylenepyrrol-2-one nucleus of such compounds are summarized.1 Introduction2 Intramolecular Cyclization Reactions: C3–N or C3–C3a and C–C Bond Formation3 Intermolecular Annulative Coupling Reacti

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15

Martínez-García, Lucas, Rubén Lobato, Gustavo Prado, Pablo Monje, F. Javier Sardina, and M. Rita Paleo. "C–C Bond-Forming and Bond-Breaking Processes from the Reaction of Diesters with Me3SnLi. Synthesis of Complex Bridged Polycycles and Dialkyl Aromatic Compounds." Journal of Organic Chemistry 84, no. 4 (2019): 1887–97. http://dx.doi.org/10.1021/acs.joc.8b02891.

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16

Yeagley, Andrew A., Melissa A. Lowder, and Jason J. Chruma. "Tandem C−C Bond-Forming Processes: Interception of the Pd-Catalyzed Decarboxylative Allylation of Allyl Diphenylglycinate Imines with Activated Olefins." Organic Letters 11, no. 17 (2009): 4022–25. http://dx.doi.org/10.1021/ol901745x.

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17

Higham, Joe I., and James A. Bull. "Transient imine directing groups for the C–H functionalisation of aldehydes, ketones and amines: an update 2018–2020." Organic & Biomolecular Chemistry 18, no. 37 (2020): 7291–315. http://dx.doi.org/10.1039/d0ob01587c.

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This review describes recent advances in C–H functionalisation using transient directing groups. Advances in directing group design, new bond forming methodologies, regio- and stereoselective processes, and new mechanistic insights are discussed.

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18

Komura, Kenichi, Toshiya Kawamura, and Yoshihiro Sugi. "Layered silicate PLS-1: A new solid base catalyst for C–C bond forming reactions." Catalysis Communications 8, no. 4 (2007): 644–48. http://dx.doi.org/10.1016/j.catcom.2006.08.015.

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19

Kühnert, Janett, Martin Lamač, Jan Demel, Anja Nicolai, Heinrich Lang, and Petr Štěpnička. "Phosphinoferrocenyl-terminated amidoamines: Synthesis and catalytic utilization in palladium-mediated C–C bond forming reactions." Journal of Molecular Catalysis A: Chemical 285, no. 1-2 (2008): 41–47. http://dx.doi.org/10.1016/j.molcata.2008.01.026.

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20

Gaona, Aidé, Urbano Díaz, and Avelino Corma. "Functional Acid and Base Hybrid Catalysts Organized by Associated (Organo)aluminosilicate Layers for C–C Bond Forming Reactions and Tandem Processes." Chemistry of Materials 29, no. 4 (2017): 1599–612. http://dx.doi.org/10.1021/acs.chemmater.6b04563.

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21

Popov, Stasik, Brian Shao, Alex L. Bagdasarian, et al. "Teaching an old carbocation new tricks: Intermolecular C–H insertion reactions of vinyl cations." Science 361, no. 6400 (2018): 381–87. http://dx.doi.org/10.1126/science.aat5440.

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Vinyl carbocations have been the subject of extensive experimental and theoretical studies over the past five decades. Despite this long history in chemistry, the utility of vinyl cations in chemical synthesis has been limited, with most reactivity studies focusing on solvolysis reactions or intramolecular processes. Here we report synthetic and mechanistic studies of vinyl cations generated through silylium–weakly coordinating anion catalysis. We find that these reactive intermediates undergo mild intermolecular carbon-carbon bond–forming reactions, including carbon-hydrogen (C–H) insertion i

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22

Cera, Gianpiero, Michel Chiarucci, and Marco Bandini. "Accessing chemical diversity by stereoselective gold-catalyzed manipulation of allylic and propargylic alcohols." Pure and Applied Chemistry 84, no. 8 (2012): 1673–84. http://dx.doi.org/10.1351/pac-con-11-09-05.

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The combined use of asymmetric Au(I) catalysis with allylic as well as propargylic alcohols proved to be a competent synthetic tool, toward the realization of complex molecular organic architectures in a stereochemically defined manner. In particular, allylic alcohols have been utilized as alkylating agents in the synthesis of tetrahydrocarbazoles/carbolines and morpholines by means of new C–C and C–X bond-forming processes. Analogously, the direct activation of indole-propargylic alcohols with cationic Au complexes opened a direct access to tetracyclic fused indolines in a highly stereoselect

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23

Crochet, Pascale, and Victorio Cadierno. "Arene-Osmium(II) Complexes in Homogeneous Catalysis." Inorganics 9, no. 7 (2021): 55. http://dx.doi.org/10.3390/inorganics9070055.

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Although the application of arene-osmium(II) complexes in homogeneous catalysis has been much less studied than that of their ruthenium analogues, different works have shown that, in some instances, a comparable or even superior effectiveness can be achieved with this particular class of compounds. This review article focuses on the catalytic applications of arene-osmium(II) complexes. Among others, transfer hydrogenation, hydrogenation, oxidation, and nitrile hydration reactions, as well as different C-C bond forming processes, are comprehensively discussed.

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24

Dominguez, Beatriz, Beatriz Iglesias, and Angel R. de Lera. "ChemInform Abstract: A Comprehensive Survey of Stille-Type C(sp2)-C(sp2) Single Bond Forming Processes in the Synthesis of Retinoic Acid and Analogues." ChemInform 31, no. 12 (2010): no. http://dx.doi.org/10.1002/chin.200012272.

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25

LI, Y., and T. J. MARKS. "ChemInform Abstract: Organolanthanoid-Catalyzed Intra- and Intermolecular Tandem C-N and C-C Bond-Forming Processes of Aminodialkenes, Aminodialkynes, Aminoalkeneynes, and Aminoalkynes. New Regiospecific Approaches to Pyrrolizidine, Indolizidine, Pyrrole,." ChemInform 29, no. 27 (2010): no. http://dx.doi.org/10.1002/chin.199827135.

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26

Górski, Marcin, and Teresa Szymańska-Buzar. "Tungsten(II)-initiated ring-opening metathesis polymerization and other C–C bond forming reactions of 5-vinyl-2-norbornene." Journal of Molecular Catalysis A: Chemical 257, no. 1-2 (2006): 41–47. http://dx.doi.org/10.1016/j.molcata.2006.04.006.

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27

Byrne, Paul G., M. Esther Garcia, John C. Jeffery, Paul Sherwood, and F. Gordon A. Stone. "Reactions between µ-alkylidyne iron–molybdenum complexes and but-2-yne: unusually facile C–C bond forming processes accompanied by hydrogen migration between carbon centres." J. Chem. Soc., Chem. Commun., no. 2 (1987): 53–55. http://dx.doi.org/10.1039/c39870000053.

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28

Soengas, Raquel G., and Humberto Rodríguez-Solla. "Modern Synthetic Methods for the Stereoselective Construction of 1,3-Dienes." Molecules 26, no. 2 (2021): 249. http://dx.doi.org/10.3390/molecules26020249.

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The 1,3-butadiene motif is widely found in many natural products and drug candidates with relevant biological activities. Moreover, dienes are important targets for synthetic chemists, due to their ability to give access to a wide range of functional group transformations, including a broad range of C-C bond-forming processes. Therefore, the stereoselective preparation of dienes have attracted much attention over the past decades, and the search for new synthetic protocols continues unabated. The aim of this review is to give an overview of the diverse methodologies that have emerged in the la

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29

Li, Yanwu, and Tobin J. Marks. "Organolanthanide-Catalyzed Intra- and Intermolecular Tandem C−N and C−C Bond-Forming Processes of Aminodialkenes, Aminodialkynes, Aminoalkeneynes, and Aminoalkynes. New Regiospecific Approaches to Pyrrolizidine, Indolizidine, Pyrrole, and Pyrazine Skeletons." Journal of the American Chemical Society 120, no. 8 (1998): 1757–71. http://dx.doi.org/10.1021/ja972643t.

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30

Li, Ningbo, Qi Fan, Li Xu, et al. "Air-stable Organoantimony (III) Perfluoroalkyl(aryl)sulfonate complexes as highly efficient, selective, and recyclable catalysts for C–C and C–N bond-forming reactions." Molecular Catalysis 511 (July 2021): 111727. http://dx.doi.org/10.1016/j.mcat.2021.111727.

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31

Protti, Stefano, Daniele Dondi, Maurizio Fagnoni, and Angelo Albini. "Photochemistry in synthesis: Where, when, and why." Pure and Applied Chemistry 79, no. 11 (2007): 1929–38. http://dx.doi.org/10.1351/pac200779111929.

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A series of photochemical reactions are assessed under the environmental aspect by using Eissen and Metzger's EATOS (environmental assessment tool for organic syntheses) method and are compared with strictly analogous thermal processes. These include C-C bond-forming reactions (arylation and alkylation) and selective oxidation and reduction reactions. In most cases, the photochemical method is experimentally simpler and less expensive than the thermal alternative. A disadvantage is that photochemical reactions are carried out in rather dilute solution, and this factor gives by far the main con

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32

Vinogradova, Ekaterina V. "Organometallic chemical biology: an organometallic approach to bioconjugation." Pure and Applied Chemistry 89, no. 11 (2017): 1619–40. http://dx.doi.org/10.1515/pac-2017-0207.

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AbstractThis review summarizes the history and recent developments of the field of organometallic chemical biology with a particular emphasis on the development of novel bioconjugation approaches. Over the years, numerous transformations have emerged for biomolecule modification with the use of organometallic reagents; these include [3+2] cycloadditions, C–C, C–S, C–N, and C–O bond forming processes, as well as metal-mediated deprotection (“decaging”) reactions. These conceptually new additions to the chemical biology toolkit highlight the potential of organometallic chemistry to make a signif

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33

Meng, Qingyan, Syed G. A. Moinuddin, Sung-Jin Kim, et al. "Pterocarpan synthase (PTS) structures suggest a common quinone methide–stabilizing function in dirigent proteins and proteins with dirigent-like domains." Journal of Biological Chemistry 295, no. 33 (2020): 11584–601. http://dx.doi.org/10.1074/jbc.ra120.012444.

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The biochemical activities of dirigent proteins (DPs) give rise to distinct complex classes of plant phenolics. DPs apparently began to emerge during the aquatic-to-land transition, with phylogenetic analyses revealing the presence of numerous DP subfamilies in the plant kingdom. The vast majority (>95%) of DPs in these large multigene families still await discovery of their biochemical functions. Here, we elucidated the 3D structures of two pterocarpan-forming proteins with dirigent-like domains. Both proteins stereospecifically convert distinct diastereomeric chiral isoflavonoid precursor

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34

Yamada, Tsuyoshi, Jing Jiang, Naoya Ito, et al. "Development of Facile and Simple Processes for the Heterogeneous Pd-Catalyzed Ligand-Free Continuous-Flow Suzuki–Miyaura Coupling." Catalysts 10, no. 10 (2020): 1209. http://dx.doi.org/10.3390/catal10101209.

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The Suzuki–Miyaura coupling reaction is one of the most widely utilized C–C bond forming methods to create (hetero)biaryl scaffolds. The continuous-flow reaction using heterogeneous catalyst-packed cartridges is a practical and efficient synthetic method to replace batch-type reactions. A continuous-flow ligand-free Suzuki–Miyaura coupling reaction of (hetero)aryl iodides, bromides, and chlorides with (hetero)aryl boronic acids was developed using cartridges packed with spherical resin (tertiary amine-based chelate resin: WA30)-supported palladium catalysts (7% Pd/WA30). The void space in the

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35

Suárez-Pantiga, Samuel, and José M. González. "Electrophilic activation of unsaturated systems: Applications to selective organic synthesis." Pure and Applied Chemistry 85, no. 4 (2013): 721–39. http://dx.doi.org/10.1351/pac-con-12-10-24.

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Selected examples from previous work on iodonium-triggered approaches for the functionalization of unsaturated systems, which summarize innovative transformations, are presented. This section is mostly focused on C–C bond-forming processes from alkynes that are directly bonded to relevant heteroatoms, such as iodine, silicon, or sulfur. Besides, recent advances related to iodonium-promoted C–H functionalization reactions are briefly outlined. A second section shows representative examples of our current research activity on electrophilic reactions aimed at the activation of unsaturated systems

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36

Wang, Shuai, Iker Agirrezabal-Telleria, Aditya Bhan, Dante Simonetti, Kazuhiro Takanabe, and Enrique Iglesia. "Catalytic routes to fuels from C1 and oxygenate molecules." Faraday Discussions 197 (2017): 9–39. http://dx.doi.org/10.1039/c7fd00018a.

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This account illustrates concepts in chemical kinetics underpinned by the formalism of transition state theory using catalytic processes that enable the synthesis of molecules suitable as fuels from C<sub>1</sub> and oxygenate reactants. Such feedstocks provide an essential bridge towards a carbon-free energy future, but their volatility and low energy density require the formation of new C–C bonds and the removal of oxygen. These transformations are described here through recent advances in our understanding of the mechanisms and site requirements in catalysis by surfaces, with emphasis on en

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Kamanna, Kantharaju, and Santosh Y. Khatavi. "Microwave-accelerated Carbon-carbon and Carbon-heteroatom Bond Formation via Multi-component Reactions: A Brief Overview." Current Microwave Chemistry 7, no. 1 (2020): 23–39. http://dx.doi.org/10.2174/2213346107666200218124147.

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Multi-Component Reactions (MCRs) have emerged as an excellent tool in organic chemistry for the synthesis of various bioactive molecules. Among these, one-pot MCRs are included, in which organic reactants react with domino in a single-step process. This has become an alternative platform for the organic chemists, because of their simple operation, less purification methods, no side product and faster reaction time. One of the important applications of the MCRs can be drawn in carbon- carbon (C-C) and carbon-heteroatom (C-X; X = N, O, S) bond formation, which is extensively used by the organic

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Nie, Siyuan, Wei Shen, Shengnan Shen, et al. "Effects of Vacancy and Hydrogen on the Growth and Morphology of N-Type Phosphorus-Doped Diamond Surfaces." Applied Sciences 11, no. 4 (2021): 1896. http://dx.doi.org/10.3390/app11041896.

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Phosphorus is regarded as the best substitutional donor for n-type diamonds. However, because of vacancy-related complexes, H-related complexes, and other defects in P-doped diamonds, obtaining n-type diamonds with satisfying properties is challenging. In this report, PV and PVH complexes are studied in detail using density function theory (DFT). The formation energy reveals the possibility of emergency of these complexes when doping a single P atom. Although vacancies have difficulty forming on the surface alone, the presence of P atoms benefits the formation of PV and PVH complexes and signi

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Hölscher, Markus, Christoph Gürtler, Wilhelm Keim, Thomas E. Müller, Martina Peters, and Walter Leitner. "Carbon Dioxide as a Carbon Resource – Recent Trends and Perspectives." Zeitschrift für Naturforschung B 67, no. 10 (2012): 961–75. http://dx.doi.org/10.5560/znb.2012-0219.

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With the growing perception of industrialized societies that fossil raw materials are limited resources, academic chemical research and chemical industry have started to introduce novel catalytic technologies which aim at the development of economically competitive processes relying much more strongly on the use of alternative carbon feedstocks. Great interest is given world-wide to carbon dioxide (CO2) as it is part of the global carbon cycle, nontoxic, easily available in sufficient quantities anywhere in the industrialized world, and can be managed technically with ease, and at low cost. In

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40

Huang, Xiaohua, Kevin W. Anderson, Danilo Zim, Lei Jiang, Artis Klapars, and Stephen L. Buchwald. "Expanding Pd-Catalyzed C−N Bond-Forming Processes: The First Amidation of Aryl Sulfonates, Aqueous Amination, and Complementarity with Cu-Catalyzed Reactions." Journal of the American Chemical Society 125, no. 22 (2003): 6653–55. http://dx.doi.org/10.1021/ja035483w.

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41

Luong, Truc Thanh, Reyhaneh Tirgar, Melissa E. Reardon-Robinson, Andrzej Joachimiak, Jerzy Osipiuk, and Hung Ton-That. "Structural Basis of a Thiol-Disulfide Oxidoreductase in the Hedgehog-Forming ActinobacteriumCorynebacterium matruchotii." Journal of Bacteriology 200, no. 9 (2018): e00783-17. http://dx.doi.org/10.1128/jb.00783-17.

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ABSTRACTThe actinobacteriumCorynebacterium matruchotiihas been implicated in nucleation of oral microbial consortia leading to biofilm formation. Due to the lack of genetic tools, little is known about basic cellular processes, including protein secretion and folding, in this organism. We report here a survey of theC. matruchotiigenome, which encodes a large number of exported proteins containing paired cysteine residues, and identified an oxidoreductase that is highly homologous to theCorynebacterium diphtheriaethiol-disulfide oxidoreductase MdbA (MdbACd). Crystallization studies uncovered th

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42

Teichert, Johannes F., and Lea T. Brechmann. "Catch It If You Can: Copper-Catalyzed (Transfer) Hydrogenation Reactions and Coupling Reactions by Intercepting Reactive Intermediates Thereof." Synthesis 52, no. 17 (2020): 2483–96. http://dx.doi.org/10.1055/s-0040-1707185.

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The key reactive intermediate of copper(I)-catalyzed alkyne semihydrogenations is a vinylcopper(I) complex. This intermediate can be exploited as a starting point for a variety of trapping reactions. In this manner, an alkyne semihydrogenation can be turned into a dihydrogen-mediated coupling reaction. Therefore, the development of copper-catalyzed (transfer) hydrogenation reactions is closely intertwined with the corresponding reductive trapping reactions. This short review highlights and conceptualizes the results in this area so far, with H2-mediated carbon–carbon and carbon–heteroatom bon

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Lopat’eva, Elena R., Igor B. Krylov, Dmitry A. Lapshin, and Alexander O. Terent’ev. "Redox-active molecules as organocatalysts for selective oxidative transformations – an unperceived organocatalysis field." Beilstein Journal of Organic Chemistry 18 (December 9, 2022): 1672–95. http://dx.doi.org/10.3762/bjoc.18.179.

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Organocatalysis is widely recognized as a key synthetic methodology in organic chemistry. It allows chemists to avoid the use of precious and (or) toxic metals by taking advantage of the catalytic activity of small and synthetically available molecules. Today, the term organocatalysis is mainly associated with redox-neutral asymmetric catalysis of C–C bond-forming processes, such as aldol reactions, Michael reactions, cycloaddition reactions, etc. Organophotoredox catalysis has emerged recently as another important catalysis type which has gained much attention and has been quite well-reviewed

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Stepanenko, D. O., O. M. Grishin, and A. I. Belkova. "Analitical and experimental studies of properties of slag and slag-forming mixtures of steelmaking production." Fundamental and applied problems of ferrous metallurgy 37 (2023): 260–70. http://dx.doi.org/10.52150/2522-9117-2023-37-260-270.

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The aim of the study is to analyze and generalize the properties of slags within the CaO-SiO2-Al2O3-MgO-CaF2 system in different ratios of components and their concentrations, which is the basis of refining slags in modern steelmaking. To ensure the technological functions, the slag melt should have a set of optimal values of physical and chemical properties, in particular: viscosity, surface tension, electrical conductivity, melting temperature (beginning and end), enthalpy, density and others, which significantly affect the kinetics of heat and mass transfer processes in the "metal-slag" sys

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Petrov, Sergey M., Aliya G. Safiulina, Natalya Yu Bashkirtseva, Alfiya I. Lakhova, and Galiya G. Islamova. "Influence of Metal Oxides and Their Precursors on the Composition of Final Products of Aquathermolysis of Raw Ashalchin Oil." Processes 9, no. 2 (2021): 256. http://dx.doi.org/10.3390/pr9020256.

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Experiments were conducted simulating hydrothermal conversion of heavy oil in the presence of carbonate, kaolin, Al2O3, Ni2+ and Cu2+, NiO mixed with poly-α-olefins, C6H8O7, C2H4O2 at 290–375 °C and 10–135 bar. Al2O3, carbonate at 375 °C and 135 bar, accelerated the resin degradation. Experiments with carbonate at 350 °C and 10 bar showed no significant composition changes. NiSO4, CuSO4, kaolin mineral, at 350 °C and 78 bar, accelerated decomposition of resins (from 35.6% to 32.5%). Al2O3 and carbonate at 290 °C and 14 bar led to the destruction of asphaltenes (from 6.5% to 4.7% by weight), wh

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Valdés, Carlos, Miguel Paraja, and Manuel Plaza. "Transition-Metal-Free Reactions Between Boronic Acids and N-Sulfonylhydrazones or Diazo Compounds: Reductive Coupling Processes and Beyond." Synlett 28, no. 18 (2017): 2373–89. http://dx.doi.org/10.1055/s-0036-1590868.

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The metal-free reaction between diazo compounds and boronic acids has been established in recent years as a powerful C(sp3)–C bond-forming reaction. This account covers the recent advances in this area. First, the various synthetic applications of reactions with N-sulfonylhydrazones as a convenient source of diazo compounds is discussed. These transformations can be regarded as reductive couplings of carbonyl compounds. Also covered is the incorporation of other mild sources of diazo compounds in these reactions: diazotization of amines and oxidation of hydrazones. Finally, the development of

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Isamura, Bienfait Kabuyaya, and Kevin Alan Lobb. "New Insights into the (A)Synchronicity of Diels–Alder Reactions: A Theoretical Study Based on the Reaction Force Analysis and Atomic Resolution of Energy Derivatives." Molecules 27, no. 5 (2022): 1546. http://dx.doi.org/10.3390/molecules27051546.

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In the present manuscript, we report new insights into the concept of (a)synchronicity in Diels–Alder (DA) reactions in the framework of the reaction force analysis in conjunction with natural population calculations and the atomic resolution of energy derivatives along the intrinsic reaction coordinate (IRC) path. Our findings suggest that the DA reaction transitions from a preferentially concerted mechanism to a stepwise one in a 0.10 Å window of synchronicity indices ranging from 0.90 to 1.00 Å. We have also shown that the relative position of the global minimum of the reaction force consta

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Laxmi, Dandamudi Sri, Suryadevara V. Vardhini, Venkata R. Guttikonda, Mandava V. B. Rao, and Manojit Pal. "Synthesis of 2-substituted Furo[3,2-b]pyridines Under Pd/C-Cu Catalysis Assisted by Ultrasound: Their Evaluation as Potential Cytotoxic Agents." Anti-Cancer Agents in Medicinal Chemistry 20, no. 8 (2020): 932–40. http://dx.doi.org/10.2174/1871520620666200311102304.

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Background: Compounds containing furo[3,2-b]pyridine framework have shown interesting pharmacological properties, including anticancer activities. Though these compounds are generally synthesized via the heteroannulation processes involving acetylenic derivatives, some of them are complex. Objective: The study aimed to explore a series of 2-substituted furo[3,2-b]pyridines for their cytotoxic properties against cancer cell lines in vitro. Methods: We developed a convenient synthesis of 2-substituted furo[3,2-b]pyridines via sequential (i) C-C coupling followed by (ii) C-O bond-forming reaction

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Sun, Chang Q. "Origin and Processes of O-Cu(001) and the O-Cu(110) Biphase Ordering." International Journal of Modern Physics B 12, no. 09 (1998): 951–64. http://dx.doi.org/10.1142/s0217979298000533.

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From the perspective of bond forming, origin of phase-formation on the O-Cu(001) and the O-Cu(110)is analyzed. It is suggested that the formation of the O -1 and the hybridized- O -2 gives in nature the c (2 × 2)-O and subsequently, the [Formula: see text]phase, on the Cu(001). The re-ordering of the primary Cu2O units transforms the Cu(110)-(2×1)-O into the c (6 × 2)-O. As consequences of the O-2 -hybridization, the Cu(001)-[Formula: see text] differs from the Cu(110)-(2×1)-O in origin by nothing more than that the -O-Cu-chain rotates 45° to fit itself to the coordination-surrounding. It prop

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Bhilare, Shatrughn, Harshita Shet, Yogesh S. Sanghvi, and Anant R. Kapdi. "Discovery, Synthesis, and Scale-up of Efficient Palladium Catalysts Useful for the Modification of Nucleosides and Heteroarenes." Molecules 25, no. 7 (2020): 1645. http://dx.doi.org/10.3390/molecules25071645.

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Nucleic acid derivatives are imperative biomolecules and are involved in life governing processes. The chemical modification of nucleic acid is a fascinating area for researchers due to the potential activity exhibited as antiviral and antitumor agents. In addition, these molecules are also of interest toward conducting useful biochemical, pharmaceutical, and mutagenic study. For accessing such synthetically useful structures and features, transition-metal catalyzed processes have been proven over the years to be an excellent tool for carrying out the various transformations with ease and unde

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