Results 61 to 70 of about 20,891 (238)

Synthesis of Optically Active 2-Alkoxy-2H-pyran-3(6H)-ones. Their Use as Dienophiles in Diels−Alder Cycloadditions [PDF]

, 2016
Optically active 2-alkoxy-2H-pyran-3(6H)-ones (4a−d) were synthesized in one step by the tin(IV) chloride-promoted glycosylation and rearrangement of the 2-acetoxy-3,4-di-O-acetyl-d-xylal (3) prepared from d-xylose (1).
Christian A. Iriarte Capaccio (3029214), Oscar Varela (1795819)   +1 more
core   +1 more source

The crystal structures of 6′-(4-chlorophenyl)- and 6′-(4-methoxyphenyl)-6a′-nitro-6a′,6b′,7′,9′,10′,12a′-hexahydro-2H,6′H,8′H-spiro[acenaphthylene-1,12′-chromeno[3,4-a]indolizin]-2-one

Acta Crystallographica Section E: Crystallographic Communications, 2019
In the title compounds, C32H25ClN2O4 (I) and C33H28N2O5 (II), the six-membered pyran and piperidine rings adopt envelope and chair conformations, respectively. The five-membered pyrrolidine rings adopt twist conformations. Compound (II) crystallizes with
S. Syed Abuthahir, M. NizamMohideen, V. Viswanathan, D. Velmurugan, J. Nagasivarao   +4 more
doaj   +1 more source

Gradient‐Structured Polymer Fiber Mats for Broadly Tunable Multicolor and White Lasing

Laser &Photonics Reviews, EarlyView.
Hierarchically engineered electrospun fiber mats containing separated red, green, and blue dyes enable highly tunable multicolor and white random lasing. Spatially controlled dye distribution suppresses energy transfer, allowing precise color adjustment across wide color gamuts and accurate reproduction of daylight white standards.
Alina Szukalska, Kinga Halicka‐Stępień, Jastin Popławski, Katarzyna Kołodzińska, Michal Majkowski, Joanna Cabaj, Lech Sznitko   +6 more
wiley   +1 more source

Crystal structure and Hirshfeld surface analysis of 2-[(2-oxo-2H-chromen-4-yl)oxy]acetic acid dimethyl sulfoxide monosolvate

Acta Crystallographica Section E: Crystallographic Communications, 2019
The title compound, C11H8O5·(CH3)2SO, is a new coumarin derivative. The asymmetric unit contains two coumarin molecules (A and B) and two dimethylsulfoxide solvent molecules (A and B).
S. Syed Abuthahir, M. NizamMohideen, V. Viswanathan, M. Govindhan, K. Subramanian   +4 more
doaj   +1 more source

A substituent-controlled general approach to access arylated pyran-2-ones and pyrano[3,4-c]pyran-1,8-diones [PDF]

, 2007
2H-Pyran-2-ones are useful precursors for the synthesis of various aromatic and heterocyclic compounds. In this Letter, we describe substituent-controlled direct access to functionalized 4-(2-oxo-1,2-diarylethyl)-5,6-diaryl-pyran-2-ones by stirring a ...
Raghunandan, Resmi, Goel, Atul, Chaurasia, Sumit, Maulik, Prakas R., Dixit, Manish, Singh, Fateh V.   +5 more
core   +1 more source

Plasmepsins as Antimalarial Drug Targets—Then, Now, and the Future

Medicinal Research Reviews, EarlyView.
ABSTRACT Malaria is a devastating disease caused by Plasmodium parasites. Plasmodium parasites express ten cathepsin D‐like aspartyl proteases, called plasmepsins (PMs). These PMs have diverse roles fulfill diverse functions throughout the parasite's lifecycle, though several exhibit functional redundancies. Among them, PMV, PMIV, and PMX are essential
Brad E. Sleebs
wiley   +1 more source

The continuing significance of chiral agrochemicals

Pest Management Science, Volume 81, Issue 4, Page 1697-1716, April 2025.
In the time frame 2018–2023, around 43% of the 35 chiral agrochemicals introduced to the market (herbicides, fungicides, insecticides, acaricides, and nematicides) contain one or more stereogenic centers in the molecule, and almost 69% of them have been marketed as racemic mixtures of enantiomers or stereoisomers.
Peter Jeschke
wiley   +1 more source

Novel Michael-Wittig reactions of methyl 3-oxo-4-(triphenylarsoranylidene)butanoate and substituted 2H-pyran-5-carboxylates; The synthesis of highly functionalised 2-cyclohexenonedicarboxylates [PDF]

, 1997
Novel Michael-Wittig condensations of methyl 3-oxo-4-(triphenylarsoranylidene)-butanoate 6 and substituted 2,2-dimethyl-2H-pyran-5-carboxylates 5a to 5e gave substituted 4-alkyl-6-oxo-4-cyclohexene-1,3-dicarboxylates 8a to 8e in a mixture of three keto ...
Moorhoff, CM (15481859)
core  

Theoretical study on the Diels-Alder reaction of bromo-substituted 2H-pyrane-2-ones and some substituent vinyls [PDF]

Journal of the Serbian Chemical Society, 2015
A DFT study of the reactivity, regio- and stereoselectivity of Diels-Alder reaction between 3-bromo, 5-bromo, and 3,5-dibromo-2(H)-pyran-2-ones and some weakly activated and unactivated alkenes has been carried out using density functional ...
Haghdadi Mina, Amani Hamed, Nab Nasim
doaj   +1 more source

Integrated Phytochemical Characterisation, Pharmacological Evaluation and Computational Investigation of Acampe papillosa Stem Extract

Analytical Science Advances, Volume 7, Issue 2, December 2026.
The pharmacological potential of the methanolic stem extract of Acampe papillosa is evaluated using in vivo and in silico approaches. The extract demonstrates significant anxiolytic, sedative, anti‐inflammatory, and antipyretic activities in experimental models, while molecular docking supports the observed biological effects through favorable ...
Qurratul Ain Sadia, Sadia Tamanna Tamim, Faruq Mohammed Tashriq, Nasir Uddin, Fatematus Zhohara Alam Hima, Ulfat Sobha Surat, Mily Khastagir, Muhammad Abdul Jalil, Md. Hossain Rasel, Arman Ullah Rafi, S. M. Moazzem Hossen   +10 more
wiley   +1 more source