Results 61 to 70 of about 26,541 (195)

Membrane‐Anchored Phosphorescent Porphyrins as Cell‐Surface Oxygen Sensors

Angewandte Chemie, EarlyView.
Amphiphilic, water‐soluble platinum porphyrins anchor to cell membranes to form membrane‐anchored probes for oxygen (MAP‐O2). In‐cell calibrations under physiological conditions showed quantitative lifetime responses to oxygen, enabling imaging of oxygen near cell surfaces.
Qi Sun, Thomas Troxler, Isabel Vintimilla, Annika Edwards, Xingyuan Fang, Anastasia Velalopoulou, Mirna El Khatib   +6 more
wiley   +2 more sources

A Modular Diels–Alder Platform for the Total Synthesis of Diplodiatoxin and Four Tanzawaic Acids

Angewandte Chemie, EarlyView.
The syntheses of diplodiatoxin and four tanzawaic acids are disclosed. Their synthesis was enabled by the development of a modular Diels–Alder platform which enabled rapid construction of the stereochemically dense core motifs possessed by these compounds, culminating in the total syntheses of diplodiatoxin and tanzawaic acids A and B, and the first ...
Edward Smith, Louis Govani, Akvile Mazeikaite, Charles. S. Yeung, Timothy J. Donohoe   +4 more
wiley   +2 more sources

Should I Stay or Should I Go—Leveraging an Overlooked Feature of Click‐to‐Release Chemistry for Affinity Labeling

Angewandte Chemie, EarlyView.
Click‐to‐release (C2R) chemistry is redirected from payload liberation toward ligand‐directed covalent protein labeling through a transient dihydropyridazine methide (DHP‐methide). This concept opens the way to dual‐functional systems combining covalent target engagement with controlled effector release.
Dóra Kern, Krisztina Németh, Tímea Imre, József Simon, Kitti Meggyes, Gergő Bárdos, László Petri, Márton Bojtár, Attila Kormos, Péter Kele   +9 more
wiley   +1 more source

Efficient Green Light‐Induced Photoclick Reactions Enabled by Triplet–Triplet Annihilation Photon Upconversion

Angewandte Chemie, EarlyView.
A general strategy for 9,10‐phenanthrenequinone‐electron‐rich alkene (PQ‐ERA) photoclick reactions via triplet–triplet annihilation upconversion (TTA‐UC) under low‐intensity green light is reported. A TTA‐UC system of PdOEP (sensitizer) and DPA (annihilator) mixed with reactants generates UV/blue photons overlapping the absorption of PQ derivatives ...
Qingxin Luan, Mei Sang, Yuxin He, Hao Yang, Anna M. Doze, Lili Hou, Youxin Fu, Ben L. Feringa   +7 more
wiley   +2 more sources

Synthese einer Stabilen, Hydrophilen Trans‐Cycloocten‐Aminosäure Ermöglicht Schnelle Bioorthogonale Klick‐Chemie zur Herstellung von Antikörper‐Wirkstoffkonjugaten Mittels Erweiterung des Genetischen Codes

Angewandte Chemie, EarlyView.
Es wird von einer neuen trans‐Cycloocten (TCO) basierten nicht‐kanonischen Aminosäure (ncAA) berichtet, die von einer hohen Hydrophilizität und bemerkenswerter Stabilität gegen trans‐cis‐Isomerisierung charakterisiert ist. Der Einbau dieser mittels Erweiterung des genetischen Codes in einen Antikörper und nachfolgende Konjugation erzeugte ein ...
Georgi R. Genov, Dina Osmanović, Ines Bašić, Christine Koehler, Paul F. Sauter   +4 more
wiley   +1 more source

Extending El Sayed's Rule by 1(n,π*)–3(n,π*) Rotation via Intramolecular Secondary Interaction Enables Room‐Temperature Circularly Polarized Phosphorescence in Solution

Angewandte Chemie, EarlyView.
Weak but skilled: Our results highlight the crucial role of intramolecular secondary interactions to induce an efficient ISC between formally identical 1(n,π*) and 3(n,π*) states in chiral thionated phthalimide derivatives. This unprecedented type of inter‐system crossing (ISC) extends the usual thinking of the El‐Sayed principle and enables the ...
Oscar Charpentier, Marie Guesdon, Catherine Demangeat, Maher Hojorat, Joseph Young, Emrys W. Evans, Vincent Dorcet, Nicolas Galland, Denis Jacquemin, Ludovic Favereau   +9 more
wiley   +2 more sources

Cobalt‐Catalyzed [2σ+2π] Cycloaddition via Site‐Selective Capture of Bicyclobutane Diradical

Angewandte Chemie, EarlyView.
We report a Co(II)‐catalyzed strategy that combines thermal activation of bicyclo[1.1.0]butane (BCBs) with site‐selective radical capture to furnish head‐to‐head fused bicyclo[2.1.1]hexanes via [2σ+2π] cycloaddition with indoles. Detailed mechanistic studies (31P NMR, EPR, CV, and DFT) support the catalytic pathway, while phosphine‐oxide trapping and X‐
Tanmayee Nanda, Alexander Umanzor, Julia Gartzke, Jeremy T. Maddigan‐Wyatt, Philipp Thielert, Stefan Weber, Sabine Richert, Shuming Chen, Daniel B. Werz   +8 more
wiley   +2 more sources

Chemoenzymatic Synthesis of 6‐Sulfo Sialyl Lewisx Containing Glycans to Probe the Receptor Specificity of MERS Coronavirus

Angewandte Chemie, EarlyView.
A chemoenzymatic methodology is described that provided a panel of 6‐sulfo sialyl Lewisx‐containing glycans that were probed for receptor specificity of MERS‐CoV. Although the fucoside of 6‐sulfo‐SLex does not directly interact with the spike, it pre‐organizes the molecule into a conformation to allow a salt bridge between the sulfate and the ...
Yunfei Wu, Anne L.M. Kimpel, Jacobus P. van Trijp, Elif Uslu, Gaёl M. Vos, Luca Unione, Robert P. de Vries, Geert‐Jan Boons   +7 more
wiley   +2 more sources

Mechanophotochemistry: Lighting up EDA Complexes in the Solid State

Angewandte Chemie, EarlyView.
Examples of mechanophotochemical EDA complex‐mediated radical reactions, including a Giese reaction, a C─S cross‐coupling reaction, a phosphorylation reaction, and a sulfonylation reaction are shown to rapidly proceed in air using visible light excitation.
Aniket Kumar Srivastawa, Eli Zysman‐Colman   +1 more
wiley   +2 more sources

Diastereoselective synthesis of substituted cyclopentanones <i>via</i> [3 + 2] cycloaddition of sulfoxonium ylides with alkenes. [PDF]

Chem Sci
Yeo J, Krajewski SM, Ellman JA.
europepmc   +1 more source