Results 41 to 50 of about 3,431 (233)

Synthesis of Fe3O4@SiO2@Pr-NH2@DAP as a magnetic recyclable nano-catalyst for efficient synthesis of pyranothiazolopyrimidines and 4H-pyrans under solvent-free condition

Scientific Reports, 2023
In this research, we describe the synthesis of silica-coated nano-Fe3O4 particles, which were successfully modified by diaminopyrimidine, and their physicochemical properties were characterized using FT-IR, XRD, TEM, FE-SEM, EDX, EDX-mapping, and TGA ...
Maryam Danehchin, Abbas Ali Esmaeili
doaj   +1 more source

N‐Sulfonyl Azalevoglucosan: A Versatile Platform for the Synthesis of Polysubstituted Piperidines

Chemistry – A European Journal, EarlyView.
Gain by strain: The synthesis of a levoglucosan analog, in which the pyranose oxygen has been replaced by a nitrogen, allows navigation on the piperidine ring to iteratively install functional groups at C1, C2, C3, C4, and C6 positions using simple experimental protocols with minimal protecting group manipulation.
Dylan Yorga, Jérôme Marrot, Ana Poveda, Nicolas Auberger, Jesús Jiménez‐Barbero, Jérôme Désiré, Yves Blériot   +6 more
wiley   +1 more source

Chiral Cyclopentadienyl Ruthenium Complexes as Versatile Catalysts for Enantioselective Transformations

CHIMIA, 2017
Ruthenium complexes, in particular cyclopentadienyl ruthenium (??) derivatives, catalyze a vast number of transformations in the field of homogenous catalysis.
David Kossler, Nicolai Cramer
doaj   +1 more source

Hydrochloric acid immobilized on nano‐titanium dioxide: a novel and efficient nanocatalyst for the synthesis of tetrahydrobenzo[b]pyrans [PDF]

شیمی کاربردی روز, 2017
Hydrochloric acid was immobilized onto the surface of amine functionalized nano‐titania. For this purpose, 2,4‐toluene diisocyanate (TDI) as a bi‐functional covalent linker was grafted onto a nano‐titania and next, the unreacted isocyanate groups were ...
Taiebeh Shamsi, Ali Amoozadeh, Elham Tabrizian   +2 more
doaj   +1 more source

Magnetic silica/graphene oxide nanocomposite supported ionic liquid–manganese complex as a powerful catalyst for the synthesis of tetrahydrobenzopyrans

Scientific Reports, 2023
A novel magnetic silica/graphene oxide nanocomposite supported ionic liquid/manganese complex (Fe3O4@SiO2-NH2/GO/IL-Mn) is prepared, characterized and its catalytic application is investigated.
Farkhondeh Dadvar, Dawood Elhamifar
doaj   +1 more source

Electrospun Biomass‐Derived Flexible Anodes With Hierarchical Structure via Cobalt MOF Integration for Sodium‐Ion Batteries

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
Hierarchically porous, N‐doped freestanding anode enables reversible Na+ insertion/desorption and Na–Co alloying, delivering fast kinetics, structural robustness, and durable sodium‐storage performance even under bending/folding. To develop a green, sustainable, and high‐performance anode for sodium‐ion batteries (SIBs), flexible biomass‐based carbon ...
Yuqiong He, Shengping Hou, Jie Liu, Shengbo Ge, Siqun Wang, Mashallah Rezakazemi, Feng Liang, Guanben Du, Kaimeng Xu   +8 more
wiley   +1 more source

Oxidative Difunctionalization of 2‑Amino‑4H‑pyrans in Iodobenzene Diacetate and N‑Chlorosuccinimide: Reactivity, Mechanistic Insights, and DFT Calculations [PDF]

, 2016
Oxidative difunctionalization of 2-amino-4H-pyrans was accomplished with iodobenzene diacetate (IBD) and N-chlorosuccinimide (NCS) reagents in alcoholic medium.
Santhosh Reddy Mandha (2015458), Vittal Rao Bommena (2015461), Manjula Alla (2015452), Santosh Kumar Lingala (2015455), Jagadeesh Babu Nanubolu (567973), Soujanya Yarasi (2015449)   +5 more
core   +3 more sources

Ionic liquid–driven pyran synthesis: Pathways and perspectives

Journal of Ionic Liquids
Pyrans and their fused derivatives are privileged oxygen heterocycles with broad biological activity and industrial relevance, yet their sustainable synthesis remains a continuing challenge.
Pravas Maity, Amrit Krishna Mitra
doaj   +1 more source

Retro‐Hetero‐Michael Addition Strategies in Organic Synthesis

European Journal of Organic Chemistry, EarlyView.
In this review, synthetic approaches to carbo‐ and heterocyclic compounds, including natural products, published in the last 15 years (2011–2025) which have either relied upon or included a retro‐hetero‐Michael addition step at any stage are discussed.
Dina Scarpi, Ernesto G. Occhiato
wiley   +1 more source

B-Alkyl Suzuki couplings for the stereoselective synthesis of substituted pyrans [PDF]

, 2008
Unprotected homoallylic alcohols can be directly converted to cis-2,6-disubstituted pyrans by palladium catalyzed B-alkyl Suzuki coupling and subsequent Michael ...
Fürstner, A., O'Neil, G.
core   +2 more sources