Showing papers in "Tetrahedron in 2012"

TL;DR: In this paper, a protocol for the one-pot multicomponent synthesis of diazepine derivatives using a 1,2-diamine, a linear or cyclic ketone, and an isocyanide in the presence of a catalytic amount of silica-supported iron oxide (Fe 3 O 4 /SiO 2 ) nanoparticles at ambient temperature in excellent yields is described.

TL;DR: In this paper, the authors focus on the recent developments and studies related to the synthesis of carbazoles spanning the period 2008-2011 and place particular emphasis on the methods involving cycloadditions and transition metal-assisted intramolecular aminations.

TL;DR: Chan-Lam coupling reactions and their applications on the synthesis of a number of differently functionalized heterocycles are reviewed in this article, where 125 references are provided for different types of coupling reactions.

TL;DR: A palladium-based catalyst (Fe 3 O 4 /SiO 2 /HPG-OPPh 2 -PNP) supported on chlorodiphenylphosphine-functionalized magnetic nanoparticles was successfully prepared in this article.

TL;DR: A review of asymmetric direct aldol reactions catalyzed by small enantioenriched organic molecules, particularly those involving enamine catalysis through primary and secondary amines, can be found in this article.

TL;DR: In this article, various kinds of synthetic methodologies for the synthesis of organic carbamates employing diversity of reagents and catalytic systems have been reviewed, from the beginning to the recent reports (covering till December 2010).

TL;DR: An overview of the evolution of the methods for the synthesis of enantiopure β-lactams, and the applications of the “β- lactam synthon method” for the synthesisation of biologically active compounds of medicinal interest is presented.

TL;DR: In this article, a chemosensor based on a phenolic Schiff base bearing a pyrene group (sensor 1) has been synthesized and demonstrated and showed a highly selective colorimetric response to fluoride anions based on deprotonation process and fluorescent response to cyanide anions (606-fold fluorescence quantum yield enhancement) based on cyclization process.

TL;DR: The purpose of this review is to provide an overview of all methods of direct alkene diamination, metal-mediated or otherwise.

TL;DR: This visible light photocatalytic protocol allows an expedient access to diversely functionalized and structurally constrained oxindole derivatives containing two spirocycles and four stereogenic centers, including two all-carbon quaternary centers.

TL;DR: Thiodipeptide (S,S)-1d catalyzed the stereoselective formation of the expected aldol products with excellent diastereo- and enantioselectivity and may be ascribed to the increased NeH acidity of the thioamide segment that leads to stronger H-bonding interaction with the aldehyde carbonyl at the transition state and thus higher stereoinduction.

TL;DR: An impregnated copper on magnetite catalyst is a versatile system for different domino Sonogashira-cyclization processes between 2-iodophenol and different alkynes to give the corresponding substituted benzo[b]furans.

TL;DR: The MCM-41 anchored sulfonic acid (MCM41-SO3H) was found to be a highly efficient and recoverable heterogeneous catalyst for the three-component Strecker reaction of aldehydes or ketones and diverse amines using trimethylsilyl cyanide (TMSCN) as mentioned in this paper.

TL;DR: Panigrahi, Sukalyan Dash, Sabita Patel, Bijay K. Mishra a,* Centre of Studies in Surface Science and Technology, School of Chemistry, Sambalpur University, Jyoti Vihar, Burla 768 019 as mentioned in this paper.

TL;DR: The syntheses of flavones with biologically important functional groups like C-glycoside, isoprenyl, and hydroxy functionalities at different positions available to medicinal chemists for SAR studies are reviewed in this paper.

TL;DR: A palladium-catalyzed direct desulfitative arylation of azoles at C2-position has been developed using sodium arylsulfinates as aryl sources as discussed by the authors.

TL;DR: In this article, a cationic Ir(I)-tolBINAP complex catalyzed an enantioselective C-C bond formation, which was initiated by secondary sp 3 C-H bond cleavage adjacent to nitrogen atom.

TL;DR: Ni(0)/NHC-based catalyst system can promote the amination of N -heteroaryl methyl ethers via the cleavage of normally unreactive carbon-oxygen bonds as discussed by the authors.

TL;DR: The chemosensor shows sensitive, selective, and ratiometric recognition of Cr 3+ through concurrent quenching at one wavelength and enhancement of fluorescence intensity at another wavelength, and can be used to detect Mg 2+ via UV–vis absorption spectroscopy.

TL;DR: In this article, the authors summarize recent efforts to explore new reaction types and develop new catalytic systems in this field, which may open a new channel to consider organic synthesis from easily available chemicals.

TL;DR: Different diglycolamide (DGA)-substituted calix[4]arene-based extractants were synthesized and evaluated for the extraction of Am(III) and Eu(III), representative trivalent actinide and lanthanide ions, respectively as discussed by the authors.

TL;DR: In this article, the authors described Bronsted acid catalyzed enantioselective oxysulfenylation and oxyselenenylating of olefins using enantiomerically enriched tetrahydrofurans with up to 63% with dibenzoyl-d-tartaric acid and its derivatives as catalyst.