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07 Mar 12:04

Cryo-EM fibril structures from systemic AA amyloidosis reveal the species complementarity of pathological amyloids

by Falk Liberta

Cryo-EM fibril structures from systemic AA amyloidosis reveal the species complementarity of pathological amyloids

Cryo-EM fibril structures from systemic AA amyloidosis reveal the species complementarity of pathological amyloids, Published online: 07 March 2019; doi:10.1038/s41467-019-09033-z

Systemic AA amyloidosis is caused by misfolding of the acute phase protein serum amyloid A1. Here the authors present the cryo-EM structures of murine and human AA amyloid fibrils that were isolated from tissue samples and describe how the fibrils differ in their fundamental structural properties.
06 Mar 09:23

Exploring the necessity of an acidic additive for Pd(II)-catalyzed exclusive C4-fluoroalkylation of 3-acetylindole: a detailed DFT study on the mechanism and regioselectivity

Org. Chem. Front., 2019, 6,2607-2618
DOI: 10.1039/C8QO01338A, Research Article
Jin-Feng Li, Ru-Fang Zhao, Fu-Qiang Zhou, Meng-Yao She, Jun Zhang, Bing Yin, Sheng-Yong Zhang, Jian-Li Li
The regioselectivity of Pd(II)-catalyzed exclusive C4-fluoroalkylation of 3-acetylindole arises from the transfer of electron density from the substrate to the catalyst.
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25 Jan 11:22

Sub-1.1 nm ultrathin porous CoP nanosheets with dominant reactive {200} facets: a high mass activity and efficient electrocatalyst for the hydrogen evolution reaction

Chem. Sci., 2017, 8,2769-2775
DOI: 10.1039/C6SC05687C, Edge Article
Open Access Open Access
Creative Commons Licence&nbsp This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Chao Zhang, Yi Huang, Yifu Yu, Jingfang Zhang, Sifei Zhuo, Bin Zhang
We present a convenient chemical conversion strategy for the synthesis of CoP porous ultrathin nanosheets as highly efficient catalysts for the hydrogen evolution reaction.
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11 Oct 11:22

Influence of the Headgroup of Azolium-Based Lipids on Their Biophysical Properties and Cytotoxicity

by Frank Glorius, Andreas Rühling, Da Wang, Johannes Bruno Ernst, Stephanie Wulff, Roman Honeker, Christian Richter, Angelique Ferry, Hans-Joachim Galla

Abstract

A series of (un-)charged NHC derivatives bearing two pentadecyl chains in the backbone was studied in detail to find cooperative effects between the membrane and the NHC derivative. The tendency to show lipid-like behavior is dependent on the properties of the NHC derivative headgroup, which can be modified on demand. The surface activity was investigated by film balance measurements, epifluorescence microscopy, and differential scanning calorimetry. Additionally the cytotoxicity was evaluated against different cell lines such as eukaryotic tumor cell lines. These novel lipid-like NHC derivatives offer a broad spectrum for biological applications.

Thumbnail image of graphical abstract

Use the head! A set of (un-)charged NHC derivatives bearing two pentadecyl-chains in the backbone was studied in detail. The lipid-like behavior depends on the properties of the headgroup of the NHC derivatives. The surface activity was investigated by film balance measurements, epifluorescence microscopy and differential scanning calorimetry. Additionally the cytotoxicity was evaluated against different cell lines. These novel lipid-like NHC derivatives offer a broad spectrum for biological applications.

29 Jun 07:09

Monofluoroalkenylation of Dimethylamino Compounds through Radical–Radical Cross-Coupling

by Jin Xie, Jintao Yu, Matthias Rudolph, Frank Rominger, A. Stephen K. Hashmi

Abstract

An unprecedented and challenging radical–radical cross-coupling of α-aminoalkyl radicals with monofluoroalkenyl radicals derived from gem-difluoroalkenes was achieved. This first example of tandem C(sp3)−H and C(sp2)−F bond functionalization through visible-light photoredox catalysis offers a facile and flexible access to privileged tetrasubstituted monofluoroalkenes under very mild reaction conditions. The striking features of this redox-neutral method in terms of scope, functional-group tolerance, and regioselectivity are illustrated by the late-stage fluoroalkenylation of complex molecular architectures such as bioactive (+)-diltiazem, rosiglitazone, dihydroartemisinin, oleanic acid, and androsterone derivatives, which represent important new α-amino C−H monofluoroalkenylations.

Thumbnail image of graphical abstract

Privileged products: A α-C(sp3)−H monofluoroalkenylation of unactivated tertiary amines through a mild, efficient, and redox-neutral route delivers privileged tetrasubstituted monofluoroalkenes under photoredox catalysis through the radical–radical cross- coupling of α-aminoalkyl radicals with monofluoroalkenyl radicals. This method enables the challenging late-stage monofluoroalkenylation of complex molecules.

17 Feb 16:38

Weak backbone CH[THREE DOTS, CENTERED]O[DOUBLE BOND, LENGTH AS M-DASH]C and side chain tBu[THREE DOTS, CENTERED]tBu London interactions help promote helix folding of achiral NtBu peptoids

Chem. Commun., 2016, 52,4573-4576
DOI: 10.1039/C6CC00375C, Communication
G. Angelici, N. Bhattacharjee, O. Roy, S. Faure, C. Didierjean, L. Jouffret, F. Jolibois, L. Perrin, C. Taillefumier
The synthesis and helix folding propensity of achiral all-cis amide (NtBu)-glycine oligomers is reported.
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18 Jan 09:55

A copper(I)-catalyzed three-component reaction of triethoxysilanes, sulfur dioxide, and alkyl halides

Org. Chem. Front., 2016, 3,359-363
DOI: 10.1039/C5QO00399G, Research Article
Danqing Zheng, Runyu Mao, Zhiming Li, Jie Wu
A copper(I)-catalyzed three-component reaction of triethoxysilanes, DABCO[middle dot](SO2)2, and alkyl halides is reported. This transformation provides a facile route to sulfones under ligand-free conditions catalyzed by copper(I) oxide. The insertion of sulfur dioxide is efficient, and both triethoxyarylsilanes and triethoxyalkylsilanes are practicable during the coupling process.
The content of this RSS Feed (c) The Royal Society of Chemistry