Results 51 to 60 of about 5,225 (230)

Azirinium ylides from α-diazoketones and 2H-azirines on the route to 2H-1,4-oxazines: three-membered ring opening vs 1,5-cyclization

Beilstein Journal of Organic Chemistry, 2015
Strained azirinium ylides derived from 2H-azirines and α-diazoketones under Rh(II)-catalysis can undergo either irreversible ring opening across the N–C2 bond to 2-azabuta-1,3-dienes that further cyclize to 2H-1,4-oxazines or reversibly undergo a 1,5 ...
Nikolai V. Rostovskii, Mikhail S. Novikov, Alexander F. Khlebnikov, Galina L. Starova, Margarita S. Avdontseva   +4 more
doaj   +1 more source

Discovery of C-3 Tethered 2-oxo-benzo[1,4]oxazines as Potent Antioxidants: Bio-Inspired Based Design, Synthesis, Biological Evaluation, Cytotoxic, and in Silico Molecular Docking Studies

Frontiers in Chemistry, 2018
The discovery of C-3 tethered 2-oxo-benzo[1,4]oxazines as potent antioxidants is disclosed. All the analogs 20a-20ab have been synthesized via “on water” ultrasound-assisted irradiation conditions in excellent yields (upto 98%).
Vashundhra Sharma, Pradeep K. Jaiswal, Mukesh Saran, Dharmendra Kumar Yadav, Saloni, Manas Mathur, Ajit K. Swami, Sanjeev Misra, Mi-hyun Kim, Sandeep Chaudhary   +9 more
doaj   +1 more source

A Non‐Antigenic Randomized Polyethylene Glycol/Poly(2‐Phenyl‐2‐Oxazine)‐Based Drug Delivery Platform

Macromolecular Rapid Communications, EarlyView.
Randomized PEG (rPEG), a conceptually new PEG alternative, is combined with poly(2‐phenyl‐2‐oxazine) (PPheOzi) to establish an rPEG‐b‐PPheOzi‐b‐rPEG micellar drug delivery platform. The PPheOzi block enables high drug loadings, while competitive ELISA reveals a drastic reduction in anti‐PEG antibody affinity of rPEG in comparison to PEG.
Julian Schmidt, Anna‐Lena Ziegler, Florian T. Kaps, Laura J. Rosenberger, Matthias Bros, Holger Frey, Robert Luxenhofer   +6 more
wiley   +1 more source

Thermally Bistable Stiff Stilbene Photoswitches and Polymer Applications

The Chemical Record, EarlyView.
Thermally stable photoswitches offer new opportunities for controlling polymer structures and functions under nonequilibrium conditions. This Personal Account highlights stiff stilbene (SS) and sterically hindered stiff stilbene (HSS) photoswitches, which combine large structural changes with exceptional thermal bistability.
Keiichi Imato
wiley   +1 more source

Mechanisms and advancement of antifading agents for fluorescence microscopy and single-molecule spectroscopy [PDF]

, 2011
Modern fluorescence microscopy applications go along with increasing demands for the employed fluorescent dyes. In this work, we compared antifading formulae utilizing a recently developed reducing and oxidizing system (ROXS) with commercial antifading ...
Aitken, Andreas Maiser, Betzig, Blanchard, Blanchard, Christian Steinhauer, Cooper, Cordes, Cordes, Cordes, Dave, Eggeling, Eggeling, Fernandez-Suarez, Fletcher, Giepmans, Hell, Joslyn, Kong, Longin, Lothar Schermelleh, Moerner, Ono, Orrit, Panchuk-Voloshina, Pertsinidis, Philip Tinnefeld, Rasnik, Rothbauer, Rust, Santoso, Schermelleh, Schermelleh, Solomatin, Staudt, Steinhauer, Thorben Cordes, Tsien, Vogelsang, Vogelsang, Vogelsang, Vogelsang, Vogelsang, White, Widengren   +44 more
core   +5 more sources

Accessing New Phenanthroline–Oxazine Scaffolds as Copper‐Dependent DNA Damaging Probes

ChemBioChem, Volume 27, Issue 8, April 2026.
New phenanthroline–oxazine ligands derived from natural amino acids are synthesized through an optimized, predictive strategy. When coordinated to copper, these scaffolds display tunable DNA binding, groove selectivity, and oxidative cleavage activity, revealing clear structure activity relationships and expanding the toolbox of copper‐dependent ...
Rebecca Lynn, Alex Gibney, Eva Delahunt, Stephen MacDonald‐Brown, Carlos Lence, Miles Kenny, Matt Allen, Ravil Khaybullin, Iva Lukac, Andrew Jordan, Andrew Kellett   +10 more
wiley   +1 more source

Silver and platinum-catalysed addition of O–H and N–H bonds to allenes [PDF]

, 2014
Transition-metal catalysed nucleophile addition to allenes is a very powerful tool for the synthesis of functionalised molecules containing heteroatoms, heterocycles in the intramolecular version, or allyl derivatives in the intermolecular version.
Munoz-Herranz, Maria
core   +1 more source

The Impact of Chemical Modifications on the Photochromism of Spiropyran: A Roadmap to Navigate Powerful Photochromes

ChemPhotoChem, Volume 10, Issue 4, April 2026.
This review summarizes how even minor chemical modifications can be used to shape spiropyran photochromism. We highlight how substituents, strain, and heteroatoms tune absorption, stability, switching efficiency, and overall photochromic behaviour.
Gianni Pacella, Giuseppe Portale
wiley   +1 more source

A Synthetic Approach to Pyrazolopyranopyrimidinones and Pyrazolopyranooxazinones as Antimicrobial Agents

Journal of Chemistry, 2016
The hitherto unknown 6-amino-4-(2-chloro-5-nitrophenyl)-3-methyl-1,4-dihydropyrano[2,3-c] pyrazole-5-carbonitrile 1a was synthesized. Both 1a and its 2,4 dichlorophenyl derivative 1b were utilized as building blocks for the preparation of novel class of ...
A. K. Elziaty, G. Bassioni, A. M. A. Hassan, H. A. Derbala, M. S. Abdel-Aziz   +4 more
doaj   +1 more source

Efficient synthesis of 1,3-naphtoxazine derivatives using reusable magnetic catalyst (GO-Fe3O4–Ti(IV)): anticonvulsant evaluation and computational studies

BMC Chemistry, 2022
A series of 2-aryl/alkyl-2,3-dihydro-1H-naphtho[1,2-e][1,3]oxazines (S 1 –S 11 ) were synthesized with an eco-friendly and recoverable nanocatalyst (GO-Fe3O4–Ti(IV)) as an efficient magnetic composite. The new nanocatalyst was characterized by FT-IR, XRD
Soghra Khabnadideh, Aida solhjoo, Reza Heidari, Leila Amiri Zirtol, Amirhossein Sakhteman, Zahra Rezaei, Elaheh Babaei, Samaneh Rahimi, Leila Emami   +8 more
doaj   +1 more source