Showing papers in "Tetrahedron in 2017"

TL;DR: In this paper, a review of the recent evolution in the exciting research direction, focusing on the discovery and development of new reactivity, new selectivity, and more recently, a metal free catalytic borylation system has been disclosed.

TL;DR: In this article, the most recent advances in transition-metal-catalyzed [2,3]-sigmatropic rearrangements of sulfonium, oxonium and ammonium ylides are discussed.

TL;DR: The multicomponent Mannich reaction is a green and classical method for the preparation of β-aminoketones and β-aminoaldehydes (Mannich bases) and, as such, is one of the most important reactions in organic chemistry as discussed by the authors.

TL;DR: In this paper, the authors present a survey of studies that combine sonochemistry with green, non-conventional solvents or with no Solvents, evidencing how the most frequently investigated options are water phase, ionic liquids, followed by ethylene glycol and its oligomers, glycerol, and few other biomass-based solvements.

TL;DR: In this paper, the first light-driven plastic mill is developed, which converts the incoming light directly into a continuous rotation, and the mechanism of motion originates from the fast photo-thermal isomerization around the C N bond of hydrazones.

TL;DR: The goal of this review is to collect the recent developments in asymmetric organocatalytic enantioselective Morita−Baylis−Hillman reactions reported since the beginning of 2013, illustrating that they constitute synthetically important synthons in organic chemistry.

TL;DR: In this paper, a simple and efficient protocol was used for the synthesis of the nano-Fe3O4@SiO2 supported Pd(0) (Fe3 O4@ SiO2-Pd) nanoparticles by the simple method from rice husk biomass as the source of biosilica.

TL;DR: In this paper, a coumarin-based compound featuring thiosemicarbazone as binding unit, was reported as a colorimetric and fluorescent probe for the detection of fluoride anion.

TL;DR: In this paper, the key role of global electron density transfer in polar cycloaddition reactions is analyzed within the Molecular Electron Density Theory (MEDT) using Density Functional Theory (DFT) calculations at the MPWB1K/6-311G(d) computational level.

TL;DR: In this article, the first one-pot room-temperature protocol for the synthesis of 3,5-disubstituted-1,2,4-oxadiazoles via the condensation between amidoximes and carboxylic acid esters in superbase medium MOH/DMSO is reported.

TL;DR: The UV–vis absorption and fluorescence spectra indicated that the fluorogenic probe had good thiols selectivity and sensitivity, particularly for glutathione in CH3CN:HEPES (3:2, v/v) buffer, which was successfully applied to the fluorescence imaging detection of glutATHione in human cervical squamous cancer cells (SiHa cells.

TL;DR: An enzyme powered Janus nano-motor is prepared by half-capping a thin layer of silicon dioxide onto a mesoporous silica nanoparticle of 90 nm, enabling asymmetry to the nano-architecture.

TL;DR: In this paper, a quinoline-based chemosensor for sequential detection of Cu2+ and CN− has been synthesized, where diaminomaleonitrile is introduced as recognition group.

TL;DR: The optimized artificial molecular pump operates rapidly, thanks to well-tuned noncovalent bonding interactions, paving the way to address enthalpically and entropically demanding polymers that would be difficult to obtain with the available repertoire of synthetic methods.

TL;DR: In this paper, a new highly selective fluorescent probe based on 2-(2′-aminolphenyl)-4-hydroxymethylthiazole (1) was developed for the detection of copper and iodide ions in ethanol.

TL;DR: In this article, a new fluorescent sensor based on thiophene and diethylaminophenol moieties was synthesized and its binding capabilities for metal-ion and anion recognition were investigated.

TL;DR: In this paper, a variety of vinyl sulfones were prepared from alkenes and sulfonyl hydrazides via electrochemical oxidative sulfonylation in an experimentally convenient undivided electrochemical cell equipped with graphite and iron electrodes.

TL;DR: An unprecedented palladium-catalyzed chemoselective reduction and reductive amination of nitroarenes with water as a hydrogen source mediated by diboronic acid have been discovered as discussed by the authors.

TL;DR: In this paper, an up-to-date overview on the recent advances in the diverse synthetic methodologies of flavones is presented, which will satisfy the expectations of readers who are interested in the development of the field and looking for an update.

TL;DR: In this article, the reactivity of thiosulfonates with nucleophilic reagents was investigated, and the results showed that the reaction with thiols yielded disulfide disulfides in excellent yields.

TL;DR: In this paper, the use of eggshell as economic and environmentally friendly support for preparation of the supported Pd nanoparticles (Pd NPs) through the green and simple in situ reduction method using barberry fruit extract as a reducing and stabilizing agent.

TL;DR: A cobalt-catalyzed oxidative isocyanide insertion of aminoquinoline benzamides has been developed in this article, where the reaction proceeded smoothly by using Ag 2 CO 3 as the oxidant in PhCl at 120°C and delivered products in moderate to excellent yields with excellent functional group tolerance.

TL;DR: A metal-free and chemoselective approach for the synthesis of 4,5-dihydroisoxazole derivatives has been developed by the reaction of readily accessible starting materials including 4-oxo-4 H -chromene-3-carbaldehyde, 1-phenyl-2-(1, 1,1,1-triphenyl- λ 5 -phosphanylidene)ethan-1-one and dibromo-formaldoxime under mild conditions in the presence of KHCO 3.

TL;DR: In this article, a pair of 2,3-diaryl indone derivatives (+)- and (−)-ascomindone derivatives were obtained from the culture of a mangrove endophytic fungus Ascomycota sp.

TL;DR: In this paper, the authors discuss different approaches towards dynamic functional molecular systems covering areas such as translated motion, dissipative self-assembly, self-regulation and biohybrid systems.

TL;DR: In this article, a number of synthesized supported Pd nanomaterials on aluminosilicate supports were investigated in the continuous flow hydroconversion of furfural to a range of furanic derivatives as compared to a commercial Pd/C catalyst.

TL;DR: In this paper, a new disulfuration pathway was established via cross coupling between nucleophilic disulfurating reagent and arylsilane introducing two sulfur atoms in one step.

TL;DR: A green, efficient, and rapid procedure for the synthesis of novel spiro[chromeno[4′, 3′:4,5] pyrimido[1,2-b]indazole-7,3′-indoline]-2′,6(9 H)-dione derivatives has been developed by one-pot condensation of 4-hydroxy-2H-chromen-2-one, isatin, and 1H-indazoles-

TL;DR: In this paper, the utility of 2-mercaptonicotinonitriles 3 and 4, as well as poly(pyridines) via alkylation with the corresponding bis- and poy(halo) compounds was investigated.

TL;DR: This probe with 2,4-dinitrobenzenesulfonate as a highly thiol-selective group was constructed based on the combination of excited state intramolecular proton transfer (ESIPT) and photoinduced electron transfer (PET) mechanisms and successfully demonstrated by imaging thiols in living NCI-H226 cells.