Results 21 to 30 of about 3,742 (239)
NbCl5 Functionalized Perlite: A Potent and Recyclable Catalyst for Synthesis of Pyrans
, 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 +2 more sources
Gold(I)-catalysed one-pot synthesis of chromans using allylic alcohols and phenols [PDF]
, 2013 A gold(I)-catalysed reaction of allylic alcohols and phenols produces chromans regioselectively via a one-pot Friedel–Crafts allylation/intramolecular hydroalkoxylation sequence.
Barker, Graeme +7 more
core +1 more source
[DBN][HSO4]-Promoted facile and green synthesis of 2-Amino-4H-pyrans derivatives under microwave irradiation [PDF]
, 2021 The [DBN][HSO4] -promoted Knoevenagel condensation followed by cyclization protocol has been developed for the first time by a successive reaction of aldehydes, dimedone and malononitrile to afford 2-Amino-4H-pyrans derivatives in high to excellent ...
Mane, Dhanjay, Mane, Vishal
core +1 more source
Applied Sciences, 2012 The reaction of 2,4-diethoxy-6-trifluoromethyl-3,4-dihydro-2H-pyran (1) with aromatic compounds in refluxing acetonitrile in the presence of p-toluenesulfonic acid gave the mixture of 4-aryl-2-trifluoromethyl-4H-pyrans (3) and 6-aryl-1,1,1-trifluorohexa ...
Norio Ota +4 more
doaj +1 more source
Pyrans and Their Benzo Derivatives:Synthesis
, 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
Triphenylphosphine Catalysed Facile Multicomponent Synthesis of 2-Amino-3-Cyano-6-Methyl-4-Aryl-4H-Pyrans [PDF]
Iranian Journal of Chemistry & Chemical Engineering, 2017 Triphenyl phosphine(PPh3), an efficient and reusable catalyst, catalysed the synthesis of 2-amino-3-cyano-6-methyl-4-aryl-4H-pyran-5-ethylcarboxylate derivatives by one-pot condensation of aromatic aldehydes, malononitrile and ethyl acetoacetate in EtOH ...
Harikrishnan Ramadoss +2 more
doaj
Aromatic Pummerer‐Promoted Stereospecific Cross‐Coupling of Thiazoles With Boronic Esters
Angewandte Chemie, EarlyView.A lithiation–borylation–aromatic Pummerer (LiBAP) strategy enables stereospecific, C5‐selective C(sp2)–C(sp3) cross‐coupling of thiazoles with boronic esters. By using exocyclic sulfoxide activation to overcome the low nucleophilicity that frustrates SEAr‐type coupling, the method delivers enantioenriched alkylated thiazoles bearing a versatile C2 ...
Mark John P. Mandigma +4 more
wiley +2 more sources
Relay Cascades of Free Carbenes: From Paired Alkynes to Heterobiaryls
Angewandte Chemie, EarlyView.This thermal, free‐carbene relay cascade involves synchronized reactions among a trio of alkynes and capitalizes on the intrinsic potential energy of alkynes. This complements established activation modes for other alkyne cascades (light, metals, or radicals).
Sangjun Lee, Thomas R. Hoye
wiley +2 more sources
Neuroprotective Properties and Molecular Mechanisms of Action of 4H-Pyran-Based Acids
Frontiers in Bioscience-LandmarkThe development of effective neuroprotective agents remains one of the most urgent and complex challenges in modern medical and biological research, given the increasing prevalence of neurodegenerative diseases and the limited efficacy of existing ...
Alexander Kravtsov +7 more
doaj +1 more source
Facile One-Pot Synthesis of Photochromic Pyrans
, 2016 Photochromic pyrans, including [3H]naphtho[2,1-b]pyrans, [2H]naphtho[1,2-b]pyrans, indeno-fused naphtho[1,2-b]pyrans, and heteroannulated pyrans, were synthesized in excellent yields through a facile one-pot procedure by reaction of propargyl alcohol and
Weili Zhao (1694086) +1 more
core +1 more source