Results 51 to 60 of about 24,842 (217)

Mechanistic DFT Study of 1,3-Dipolar Cycloadditions of Azides with Guanidine

Molecules, 2023
Density functional calculations SMD(chloroform)//B3LYP/6-311+G(2d,p) were employed in the computational study of 1,3-dipolar cycloadditions of azides with guanidine. The formation of two regioisomeric tetrazoles and their rearrangement to cyclic aziridines and open-chain guanidine products were modeled.
Ivana Antol, Zoran Glasovac, Davor Margetić   +2 more
openaire   +5 more sources

One Step Regioselective Synthesis of 5-Aminoisoxazoles from Nitrile Oxides and α-Cyanoenamines

Molecules, 2004
The 1,3-dipolar cycloaddition of nitrile oxides to 1-cyanoenamines gives 5-aminoisoxazoles regioselectively. Moderate to good yields could be obtained depending on the method used to generate the nitrile oxides. The intermediate isoxazolines could not be
Aïcha Derdour, Michel Vaultier, Amar Saad   +2 more
doaj   +1 more source

Functionalized Antifouling Polymer Brushes for Biospecific Surfaces

Advanced Materials Interfaces, EarlyView.
Modern biosensors offer high sensitivity but often struggle with long‐term stability and selectivity for specific targets. Antifouling polymer brushes help enhance both stability and selectivity. In this review, we compare recent antifouling coatings, their design parameters, and how they are integrated with biorecognition elements for improved ...
Erik J. Postma, Luc Scheres, Sissi de Beer, Andriy R. Kuzmyn, Han Zuilhof   +4 more
wiley   +1 more source

Water‐Catalytic Deconstructive and Proton Transfer Cyclopropanation of Sulfoxonium Ylide with Olefin

Advanced Science, EarlyView.
Water‐catalytic deconstructive and proton transfer cyclopropanation of sulfoxonium ylide with olefin is developed through a sequential water‐mediated ring‐closing/opening reaction. This atom‐economical, environmentally friendly methodology offers easy access to a range of cyclopropyl ketones with moderate to good yields.
Xianglin Yu, Liuting Huang, Haiyue Yang, Lijuan Song, Yi Jin   +4 more
wiley   +1 more source

Domino Multicomponent Approach for the Synthesis of Functionalized Spiro-Indeno[1,2-b]quinoxaline Heterocyclic Hybrids and Their Antimicrobial Activity, Synergistic Effect and Molecular Docking Simulation

Molecules, 2019
An expedient synthesis of hitherto unexplored novel hybrid heterocycles comprising dispiropyrrolidine, N-styrylpiperidone and indeno[1,2-b]quinoxaline units has been developed via domino multicomponent 1,3-dipolar cycloaddition strategy employing a new ...
Abdulrahman I. Almansour, Natarajan Arumugam, Raju Suresh Kumar, Dhaifallah M. Al-thamili, Govindasami Periyasami, Karuppiah Ponmurugan, Naif Abdullah Al-Dhabi, Karthikeyan Perumal, Dhanaraj Premnath   +8 more
doaj   +1 more source

Manganese‐Catalyzed Electrochemical Diazidation of Dehydroalanine Peptides

Advanced Science, EarlyView.
A Mn(II)‐catalyzed electrochemical method achieves site‐selective diazidation of dehydroalanine peptides with NaN₃. This radical relay process tolerates diverse functional groups, delivers high yields, and enables precise peptide modification, offering a powerful tool for bioconjugation and therapeutic development.
Xinwei Hu, Chengwei Zheng, Xiaotong Song, Balati Hasimujiang, Mu Chen, Zhixiong Ruan   +5 more
wiley   +1 more source

Reaktivität von Pnictaalumenen gegenüber 1,3‐Dipol‐Molekülen

Angewandte Chemie, EarlyView.
Pnictaalumene mit einer Pn = Al‐Mehrfachbindung unterliegen eher Azid‐ oder Diazoalken‐Insertionen als [3+2]‐Cycloadditionen. Dies führt zu AlN2Pn‐Heterocyclen, die je nach sterischem Anspruch des Azids eine große strukturelle Vielfalt aufweisen.
Tim Wellnitz, Edgar Zander, Leonie Wüst, Jakob Boardman, Max Neubauer, Samuel Nees, Holger Braunschweig, Christian Hering‐Junghans   +7 more
wiley   +1 more source

An Efficient Synthesis of Novel Dispirooxindole Derivatives via One-Pot Three-Component 1,3-Dipolar Cycloaddition Reactions

Molecules, 2012
A series of novel dispirooxindoles have been synthesized through three-component 1,3-dipolar cycloaddition of azomethine ylides generated in situ by the decarboxylative condensation of isatin and an α-amino acid with the dipolarophile 5-benzylidene-1,3 ...
Yucheng Wang, Juxian Wang, Hongtao Liu, Huiyuan Wang, Wei Lin, Lexing Xu, Zhibin Huang, Gang Chen, Qian Zhao, Daqing Shi   +9 more
doaj   +1 more source

(S)-(-)-Limonene Derivatives Containing (1H-1,2,3-Triazol-4-yl)methyl 4-Bromobenzoate

Molbank, 2011
The synthesis of (S)-(-)-limonene derivatives containing (1H-1,2,3-triazol-4-yl)methyl 4-bromobenzoate were obtained by epoxidation, azidolysis and Huisgen’s 1,3-dipolar cycloaddition.
Guillermo Valdomir, Danilo Davyt
doaj   +1 more source

The Chemistry and Biology of the Tetrodotoxin Natural Product Family

Angewandte Chemie International Edition, Accepted Article.
Tetrodotoxin is a neurotoxic marine alkaloid, first isolated in 1909 from pufferfish and named after the biological order tetraodontiformes. Since its structural elucidation in 1964, it has attracted the interest of synthetic organic chemists due to its exceptional polarity, complex architecture, and important biological activity.
Benedikt Nißl, Marcel Mülbaier, Francesca Grisoni, Dirk Trauner, Marcel Bermúdez, Clemens Dialer, David B. Konrad   +6 more
wiley   +1 more source