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14,698 Newest Publications in chemistry - a european journal

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Brønsted Base‐Catalyzed Umpolung Intramolecular Cyclization of Alkynyl Imines

17-Jan-2018 | Azusa Kondoh, Masahiro Terada, Chemistry - A European Journal, 2018

A novel "umpolung" intramolecular cyclization of alkynyl imines, in which the electrophilic imine sp2‐carbon formally serves as a nucleophilic site, was developed under Brønsted base catalysis. The reaction involves the unprecedented catalytic generation of α‐aminoester enolates from ...

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Ligand‐ and Metal‐Based Reactivity of a Neutral Ruthenium Diolefin Diazadiene Complex; The Innocent, the Guilty, and the Suspicious

17-Jan-2018 | Vivek Sinha, Bruno Pribanic, Bas de Bruin, Monica Trincado, Hansjörg Grützmacher, Chemistry - A European Journal, 2018

Coordination of the diazadiene diolefin ligand trop2dad to ruthenium leads to various complexes of composition [Ru(trop2dad)(L)]. DFT studies indicate that the closed‐shell singlet (CSS), open‐shell singlet (OSS) and triplet electronic structures of this species are close in energy, with the OSS ...

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Brønsted Acid‐Catalyzed Tandem Cyclizations of Tryptamine‐Ynamides Yielding 1H‐Pyrrolo[2,3‐d]carbazole Derivatives

17-Jan-2018 | Yanshi Wang, Jingsheng Lin, Xiaoyu Wang, Guanghui Wang, Xinhang Zhang, Bo Yao, Yuandong Zhao, Pengfei Yu, Bin Lin, Y ..., Chemistry - A European Journal, 2018

A highly efficient novel method for the construction of the core tetracyclic motif of numerous biologically active indole alkaloids was described. The cyclization precursors were easily prepared from tryptamine derivatives in five steps with excellent yields. The full potential of the developed ...

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Brønsted Acid‐Catalyzed Tandem Cyclizations of Tryptamine‐Ynamides Yielding 1H‐Pyrrolo[2,3‐d]carbazole Derivatives

17-Jan-2018 | Yanshi Wang, Jingsheng Lin, Xiaoyu Wang, Guanghui Wang, Xinhang Zhang, Bo Yao, Yuandong Zhao, Pengfei Yu, Bin Lin, Y ..., Chemistry - A European Journal, 2018

A highly efficient novel method for the construction of the core tetracyclic motif of numerous biologically active indole alkaloids was described. The cyclization precursors were easily prepared from tryptamine derivatives in five steps with excellent yields. The full potential of the developed ...

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Tsuji–Trost Reaction of Non‐Derivatized Allylic Alcohols

17-Jan-2018 | Sunisa Akkarasamiyo, Supaporn Sawadjoon, Andreas Orthaber, Joseph S. M. Samec, Chemistry - A European Journal, 2018

Pd[κ2‐BiPhePhos][η3‐C3H5][OTf] is reported as an efficient catalyst in the Tsuji–Trost reaction of non‐derivatized allylic alcohols. Both inter‐ and intramolecular stereospecific allylic substitutions with various types of nucleophiles (C‐, S‐, N‐, and O‐centered) were successfully transformed. ...

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Fluorescence redox blinking adaptable to structural analysis of nucleic acids

17-Jan-2018 | Takafumi Miyata, Naohiko Shimada, Atsushi Maruyama, Kiyohiko Kawai, Chemistry - A European Journal, 2018

The phenomenon of "blinking" is unique to single‐molecule fluorescence measurements. By designing a fluorophore with an appropriate dark state lifetime (τoff), we have devised a kinetic analysis based on the control of fluorescence blinking (KACB) to investigate the dynamics of biomolecules. By ...

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2,2'‐Bipyridine Equipped with a Disulfide/Dithiol Switch for Coupled Two Electron and Proton Transfer

17-Jan-2018 | Mauricio Cattaneo, Christine Schiewer, Anne Schober, Sebastian Dechert, Inke Siewert, Franc Meyer, Chemistry - A European Journal, 2018

[1,2]dithiino[4,3‐b:5,6‐b']dipyridine (1) and its protonated open form 3,3'‐dithiol‐2,2'‐bipyridine (2) were synthesised and their interconversion investigated. The X‐ray structure of 2 revealed an anti orientation of the two pyridine units and a zwitterionic form. In depth electrochemical ...

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The Pentagonal‐Pyramidal Hexamethylbenzene Dication: The Many Shades of Coordination Chemistry at Carbon

17-Jan-2018 | Johannes E. M. N. Klein, Remco W. A. Havenith, Gerald Knizia, Chemistry - A European Journal, 2018

A recent report of the crystal structure of the pentagonal‐pyramidal hexamethylbenzene dication C6(CH3)62+ by Malischewski and Seppelt [Angew. Chem. Int. Ed. 2017, 56, 368.] confirmed the structural proposal made in the first report of this compound in 1973 by Hogeveen and Kwant [Tetrahedron ...

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One‐Pot Synthesis of Functionalized Fused Furans via a BODIPY Catalyzed Domino Photooxygenation

17-Jan-2018 | Audrey Mauger, Jonathan Farjon, Pierrick Nun, Vincent Coeffard, Chemistry - A European Journal, 2018

Six‐membered ring fused furans containing a tetrasubstituted tertiary carbon were prepared via an unprecedented one‐pot BODIPY‐catalyzed domino photooxygenation/reduction process. A series of functionalized furans was synthesized from readily available 2‐alkenylphenols and mechanistic studies ...

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Plasmid‐Templated Control of DNA‐Cyclodextrin Nanoparticle Morphology Through Molecular Vector Design for Effective Gene Delivery

17-Jan-2018 | Laura Gallego-Yerga, Juan M Benito, Laura Blanco-Fernández, María Martínez-Negro, Itziar Vélaz, Emilio Aicart, Elen ..., Chemistry - A European Journal, 2018

Engineering self‐assembled superstructures through complexation of plasmid DNA (pDNA) and single‐isomer nanometric size macromolecules (molecular nanoparticles) is a promising strategy for gene delivery. Notably, the functionality and overall architecture of the vector can be precisely moulded ...

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