Synthesis of Polyfunctionalized 4H-Pyrans [PDF]
Journal of Chemistry, 2013 Amberlyst A21 catalyzed one-pot three-component coupling of aldehyde and malononitrile with active methylene compounds such as acetylacetone and ethyl acetoacetate for the synthesis of pharmaceutically important polyfunctionalized 4H-pyrans has been ...
Manisha Bihani +2 more
doaj +3 more sources
Synthesis of novel photochromic pyrans via palladium-mediated reactions [PDF]
Beilstein Journal of Organic Chemistry, 2009 Photochromic pyrans for applications in material and life sciences were synthesized via palladium-mediated cyanation, carbonylation and Sonogashira cross-coupling starting from bromo-substituted naphthopyran 1 and benzopyrans 2a/b.
Christoph Böttcher +7 more
doaj +2 more sources
Recent Advances in the Synthesis of 2H-Pyrans [PDF]
Molecules, 2019 In this review, we discuss the nature of the different physicochemical factors affecting the valence isomerism between 2H-pyrans (2HPs) and 1-oxatrienes, and we describe the most versatile synthetic methods reported in recent literature to access to 2HPs,
David Tejedor +4 more
doaj +2 more sources
One-pot two-step mechanochemical synthesis of arylsulfonyl 4H-pyrans [PDF]
, 2022 In this paper, a simple and environment-friendly protocol was developed for the synthesis of arylsulfonyl 4H-pyrans via L-proline-catalyzed one-pot two-step reaction of aromatic aldehyde with phenylsulphonyl acetonitrile and dimedone under ball-milling ...
Qianqian Huang (1409008) +4 more
core +1 more source
NbCl5 Functionalized Perlite: A Potent and Recyclable Catalyst for Synthesis of Pyrans [PDF]
, 2023 Niobium pentachloride functionalised perlite was prepared via a solid state dispersion technique, which was utilized as an efficient heterogeneous catalyst for the synthesis of pyrans.
Kinjal J. Shah +7 more
core +3 more sources
Heck-Type Coupling of Fused Bicyclic Vinylcyclopropanes: Synthesis of 1,2-Dihydropyridines, 2,3-Dihydro-1H-Azepines, 1,4-Cyclohexadienes, 2H-Pyrans, and 1,3-Butadienes [PDF]
, 2021 Herein, we report a versatile approach for the endocyclic ring-opening of bicyclic vinylcyclopropanes triggered by Heck arylations. Key step for this transformation is a [1,3]-migratory shift of Pd allowing the ring expansion of cyclopropanated pyrroles,
Sebastian, Fischer +6 more
core +1 more source
Pyrans and Their Benzo Derivatives:Synthesis [PDF]
, 2020 Newly reported synthetic procedures to access pyrans and their benzo derivatives from 2007 to 2018 are summarized. The sub-chapters are organized by the structural similarity starting from pyrans, reduced, oxidized, and benzene-fused structures ...
Lauridsen, Jerik Mathew Valera +2 more
core +1 more source
Iodine Catalyzed Synthesis of Substituted Furans and Pyrans: Reaction Scope and Mechanistic Insights [PDF]
, 2020 Substituted pyrans and furans are core structures found in a wide variety of natural products and biologically-active compounds. Herein, we report a practical and mild catalytic method for the synthesis of substituted pyrans and furans using molecular ...
Claude, Legault +4 more
core +1 more source
EFFECT OF PYROLYSIS HEATING RATE ON THE CHEMICAL COMPOSITION OF WOOD VINEGAR FROM EUCALYPTUS UROGRANDIS AND MIMOSA TENUIFLORA [PDF]
Revista Árvore, 2020 Among the parameters used in the biomass carbonization process, the heating rate is one of the most important. The objective of the present work was to assess the influence of different heating rates on the chemical composition of wood vinegar (WV) from ...
Lúcio César Dantas de Medeiros +5 more
doaj +1 more source
Iron(III)-Catalyzed Prins-Type Cyclization Using Homopropargylic Alcohol: A Method for the Synthesis of 2-Alkyl-4-halo-5,6-dihydro-2H-pyrans [PDF]
, 2016 A new Prins-type cyclization between homopropargylic alcohol and aldehydes in the presence of FeX3 to obtain 2-alkyl-4-halo-5,6-dihydro-2H-pyrans in good yield is described.
Pedro O. Miranda (2397970) +4 more
core +1 more source