Results 81 to 90 of about 20,891 (238)

Fluorescent Diarylethenes With Polar Groups: Synthesis, Spectra, and Optical Microscopy Applications

Chemistry – A European Journal, Volume 32, Issue 30, 13 August 2026.
Blinking green and flashing red: photo‐switchable and photo‐activatable probes emitting green and red light were prepared and applied as bioconjugates in super‐resolution optical microscopy. ABSTRACT The use of photoactivatable fluorescent diarylethenes (fDAEs) in biology‐related light microscopy has been restricted by the lack of probes having freely ...
Kakishi Uno, Sven Nagorny, Ayse Aktalay, Dojin Kim, Mariano L. Bossi, Vladimir N. Belov, Stefan W. Hell   +6 more
wiley   +1 more source

Chemistry of Pyrones, Part 3: New Podands of 4H-Pyran-4-ones

Molecules, 2000
New derivatives of 3,5-disubstituted 4H-Pyran-4-one podands (9-15) were prepared by transesterification reaction of dimethyl or diethyl 2,6-dimethyl-4H-pyran-4-one-3,5-dicarboxylate with some glycol, glycol ethers or by nucleophilic substitution of some ...
Aziz Shahrisa, Alireza Banaei
doaj   +1 more source

Synthesis of the Core Tetracycle of the Spirobiflavonoid Daphnodorin C

European Journal of Organic Chemistry, Volume 29, Issue 30, 12 August 2026.
Core spirotetracycle of daphnodorin C: Oxidative ring contraction of benzofuro[3,2‐b]chromenones affords novel 2,3′‐spirobi[benzofuran]diones, rather than the isomeric spiroketals. The first synthesis of the spirobi[benzofuran]dione core structure of the spirobiflavonoid daphnodorin C is described.
Lukas Heemann, Peter G. Jones, Thomas Lindel   +2 more
wiley   +1 more source

Dihydropyrancarboxamides Related to Zanamivir:  A New Series of Inhibitors of Influenza Virus Sialidases. 1. Discovery, Synthesis, Biological Activity, and Structure−Activity Relationships of 4-Guanidino- and 4-Amino-4H-pyran-6-carboxamides [PDF]

, 2016
4-Amino- and 4-guanidino-4H-pyran-6-carboxamides 4 and 5 related to zanamivir (GG167) are a new class of inhibitors of influenza virus sialidases. Structure−activity studies reveal that, in general, secondary amides are weak inhibitors of both influenza ...
Helen Weston (3020616), Steven L. Sollis (1981381), Neil Taylor (1443619), Peter C. Cherry (3020613), Tony Pateman (3020622), Alan Beresford (1655908), Darren Green (3020607), Richard Bethell (1705837), Andrew Merritt (2365777), Paul Wyatt (1290384), Kevin N. Cobley (3020610), Ian D. Starkey (3020625), Andrew Whittington (3020634), Safia Madar (3020628), Robert J. Fenton (3020619), Paul W. Smith (1463833), Peter D. Howes (2442736), Jan Scicinski (595241), Peter J. Morley (3020631)   +18 more
core   +1 more source

Chemistry of Pyrones, Part 5: New Crown Ether and Podand Derivatives of 3,5-Bis(bromomethyl)-2,6-diphenyl-4H-pyran-4-one

Molecules, 2001
New podand and crown ether derivatives of 3,5-disubstituted 4H-pyran-4-one (8-11) were prepared by the nucleophilic substitution reaction of 3,5-bis(bromomethyl)-2,6-diphenyl-4H-pyran-4-one with o-nitrophenol, 8-hydroxyquinoline, 2-hydroxymethyl pyridine
Alireza Banaei, Aziz Shahrisa
doaj   +1 more source

The Synthesis Use of a Difluorinated Amino‐Benzo‐Cinnoline Dyes (ABCDyes) Enables Fine Tuning of Emission Through Double SNAr Late‐Stage Functionalization

European Journal of Organic Chemistry, Volume 29, Issue 29, 7 August 2026.
An efficient synthesis of difluorinated amino‐benzo‐cinnoline dyes (ABCDyes) is reported. Their use for the late‐stage introduction of internal dinucleophilic species through a double SNAr reaction enables straightforward access to previously unexplored ABCDye analogs displaying tunable emission ranging from green to red.
Mélina Fabe, Narjis Ouazzani, Max Coehlo, Arnaud Chevalier   +3 more
wiley   +1 more source

Vibrational and structural study of 2-amino-4H-pyran derivatives [PDF]

, 2013
Seven 2-amino-4H-pyran derivatives have been studied by IR and Raman spectroscopy and the crystal structure of one (2-amino-3,5-dicyano-4-isopropyl-6-methyl-4H-pyran) has been determined by X-ray diffraction.
Seoane Prado, Carlos, Florencio, Feliciana, García-Blanco, S., Martín León, Nazario, Bellanato, Juana   +4 more
core   +1 more source

A novel poly(ethyleneoxide)-based magnetic nanocomposite catalyst for highly efficient multicomponent synthesis of pyran derivatives

Green Chemistry Letters and Reviews, 2018
In the present work, a new magnetically recyclable nanocomposite catalyst was designed, prepared, and characterized by Fourier transform infrared (FT-IR) spectroscopy, field-emission scanning electron microscopy (FE-SEM) images, X-ray diffraction (XRD ...
Ali Maleki, Mojtaba Azizi, Zeynab Emdadi
doaj   +1 more source

9-(2,4-Dinitrophenyl)-3,3,6,6-tetramethyl-3,4,5,6,7,9-hexahydro-1H-xanthene-1,8(2H)-dione

Acta Crystallographica Section E, 2013
In the title compound, C23H24N2O7, the central 4H-pyran ring adopts a flattened boat conformation, whereas both cyclohexenone rings adopt envelope conformations, the C atom bearing the dimethyl substituent being the flap atom in each case.
N. Sureshbabu, V. Sughanya
doaj   +1 more source

Chemoenzymatic Synthesis of Chiral Piperidines Using the Immobilized Transaminase ATA‐117 in Continuous Flow Reactors

Advanced Synthesis &Catalysis, Volume 368, Issue 15, 1 August 2026.
A robust continuous flow chemoenzymatic process was developed for the stereoselective synthesis of cis‐(2R,6R)‐2,6‐disubstituted piperidines, including the natural alkaloid (–)‐pinidinone. The asymmetric transamination of α,β‐unsaturated ketones was catalyzed by immobilized ATA‐117, followed by spontaneous aza‐Michael cyclization, providing the desired
Sara Vicinanza, Ilaria Magrini Alunno, Stefania Patti, Morena Pirotta, Francesca Annunziata, Raffaella Gandolfi, Paola Conti, Chiara Borsari, Ivan Bassanini, Erica Elisa Ferrandi, Daniela Monti, Lucia Tamborini   +11 more
wiley   +1 more source