Results 41 to 50 of about 871,548 (248)

Visible-light-induced trifluoroacetylation reaction of electron-deficient nitrogen heterocycles

Frontiers in Chemistry
The direct C–H trifluoroacetylation of electron-deficient nitrogen heterocycles remains a longstanding challenge with conventional reagents, owing to the inherent instability of the trifluoroacetyl radical and its polarity mismatch with electron ...
Yanshu Li, Jiangzhen An, Jiangzhen An, Qiuren Wei, Huachun Yang, Huachun Yang, Xi Li, Kai Sun, Zhongyan Cao, Xiaolan Chen, Lingbo Qu, Lingbo Qu, Bing Yu   +12 more
doaj   +1 more source

Cu2O: a simple and efficient reusable catalyst for N-arylation of nitrogen-containing heterocycles with aryl halides

, 2008
Cu2O was found to be a simple and efficient catalyst for the N-arylation of a variety of nitrogen-containing heterocycles with aryl and heteroaryl chlorides, bromides and iodides to give the products in excellent yields.
Huang, Yi-Zheng, Chen, Chen, Xu, Jie, Miao, Hong, Zhang, Qiao-Hong, 徐杰   +5 more
core   +1 more source

Mitochondria and Neuromast Tagging With Fluorescent Gallium‐Triapine Analogues: In Cellulo MP FLIM and Zebrafish Live Imaging

Advanced Science, EarlyView.
Fluorescent BODIPY‐conjugated thiosemicarbazone ligands and their Ga(III), In(III), and Fe(III) complexes, inspired by Triapine, are developed as theranostic agents. Multiphoton FLIM and confocal microscopy in cancer cells and zebrafish reveal real‐time uptake, mitochondrial localisation, and whilst spectroscopic assays indicated preserved complex ...
Megan J. Green, Michael W. Jones, Merissa Saleem, Haobo Ge, Melita Tvardauskaite, Julia Dudzic, Fernando Cortezon‐Tamarit, Rory L. Arrowsmith, Charareh Pourzand, Gabriele Kociock‐Kohn, Nicholas H. Rees, Jonathan R. Dilworth, Stephen Faulkner, Stanley W. Botchway, David Gurevich, Sofia I. Pascu   +15 more
wiley   +1 more source

Synthesis of condensed heterocycles with potential antiproliferative activity.

, 2021
In this research work, O, N-heterocycles were prepared using the domino Knoevenagel-hetero Diels-Alder reaction. Seven novel heterocycles were synthesized with moderate to good yield, using five different cyclic 1,3-dicarbonyl derivatives.
Shafique, Muhammad
core  

Calcium‐Mechanochemistry Enabled Ketone Synthesis From Organic Iodides and Carboxylic Acids

Advanced Science, EarlyView.
Mechanochemically generated organocalcium species display unusual chemoselectivity toward carboxylates, enabling direct ketone synthesis without overaddition. Ball milling activates commercial calcium metal under ambient, solvent‐minimized conditions, providing a broad substrate scope, high functional‐group tolerance, and a practical one‐step ...
Mengyao Pei, Zekun Yang, Xueyan Yang, Yufang Yang, Yangyang Shen, Jiemin Wang, Peile Ma, Zezhu Li, Xiaoliang Zheng, Xiaofeng Wei   +9 more
wiley   +1 more source

Heteroelement Analogues of Benzoxaborole and Related Ring Expanded Systems

Molecules, 2021
The review covers the chemistry of organoboron heterocycles structurally related to benzoxaboroles where one of the carbon atoms in a boracycle or a fused benzene ring is replaced by a heteroelement such as boron, silicon, tin, nitrogen, phosphorus, or ...
Krzysztof Nowicki, Piotr Pacholak, Sergiusz Luliński   +2 more
doaj   +1 more source

Pd‐Catalyzed Asymmetric Dearomative Heck/Tsuji‐Trost Difunctionalization of Naphthalenes

Advanced Science, EarlyView.
We have developed a palladium‐catalyzed asymmetric dearomative Heck/Tsuji‐Trost 1,4‐difunctionalization reaction of naphthalenes, affording 4‐aminospirocyclohexene oxindole products bearing two remote chiral centers. Through the effect of the newly designed chiral sulfinamide phosphine ligand with large steric hindrance, side reactions are inhibited ...
Long‐Ling Ma, Bing Xu, Junliang Zhang, Zhan‐Ming Zhang   +3 more
wiley   +1 more source

1,1’-(3-Methyl-4-phenylthieno[2,3-b]thiophene-2,5-diyl)diethanone as a Building Block in Heterocyclic Synthesis. Novel Synthesis of Some Pyrazole and Pyrimidine Derivatives

Molecules, 2011
A series of new bis(heterocycles) featuring thieno[2,3-b]thiophene rings was synthesized in a combinatorial manner. Intramolecular cyclization of enaminone derivatives with appropriate N-nucleophiles afforded the target compounds.
Saeed Alshahrani, Assem Barakat, Yamin Siddiqui, Yahia Nasser Mabkhot, Abdullah Mohammed Al-Majid   +4 more
doaj   +1 more source

Theretofore Highest Efficiency in Vacuum‐Deposited Organic Solar Cells Originating From Triarylamine‐Based Small‐Molecule Donors Containing Fused Heterocycle Units

Advanced Science, EarlyView.
Fused‐ring engineering unlocks record efficiency in vacuum‐deposited organic solar cells. By replacing linear π‐bridges with fused‐ring analogues in triarylamine‐based donors, we achieve enhanced molecular planarity, red‐shift optical absorption, minimize energy loss and optimized phase separation.
Yun‐Fei Li, Le‐Shan Dai, Zuo‐Chang Chen, Shi‐Long Xiong, Bin‐Wen Chen, Ke‐Yue Yang, Qiu Xiong, Yi‐Dong Yan, Kun Cao, Da‐Qin Yun, Feng He, Lin‐Long Deng, Su‐Yuan Xie, Lan‐Sun Zheng   +13 more
wiley   +1 more source

Brønsted acid-enhanced copper-catalyzed atroposelective cycloisomerization to axially chiral arylquinolizones via dearomatization of pyridine

Nature Communications, 2022
Methods to assemble axially chiral biaryl molecules with nitrogen-containing heterocycles can have implications in ligand development for homogeneous catalysis. Here the authors report enantioselective syntheses of axially chiral arylquinolizones, via an
Xiao-Long Min, Xiu-Lian Zhang, Wenbin Yi, Ying He   +3 more
doaj   +1 more source