Showing papers in "Tetrahedron in 2007"

TL;DR: In this article, a review of asymmetric 1,3-dipolar cycloaddition reactions involving a variety of heteroylides (or ylide equivalents) and dipolarophiles is presented.

TL;DR: In this article, the authors focus on the reactivity of ionic liquids, as opposed to reactivity in ionic liquid, although discussion of the latter is often included where it aids understanding of the former.

TL;DR: Methods for enantioselective C-C bond constructions via additions to imines and related compounds are reviewed, with an emphasis on the most recent efforts involving asymmetric catalysis.

TL;DR: In this paper, a detailed discussion on the application of [3+2] dipolar cycloaddition reactions in targeted syntheses is presented, and a detailed analysis of the performance of the [3 + 2] reaction is presented.

TL;DR: This mini review contains a representative sampling from the last 15 years on the kinds of reactions that have been sequenced into cascades to produce heterocyclic molecules.

TL;DR: The biological properties of disubstituted 2,5-diketopiperazines and the corresponding synthetic procedures that allow the generation of large arrays of derivatives with interesting biological applications are described.

TL;DR: In this paper, a first-principle method has been successfully developed for the prediction of p K a values of aromatic heterocyclic compounds in DMSO solution with a precision of 1.1p K a units.

TL;DR: Recent advances in the aza-Wittig reaction of phosphazene derivatives with several carbonyl compounds are reviewed in this article, where the most important applications of this reaction are the synthesis of a wide range of acyclic and heterocyclic compounds, ranging from simple moncyclic compounds to complex polycyclic and macrocyclic systems.

TL;DR: A review of the recent developments in the rapidly growing field of lipase-catalyzed asymmetric access to enantiomerically pure/enriched compounds can be found in this article.

TL;DR: This review covers the important transformations that have been used in the stereoselective synthesis of tetrahydrofurans, with emphasis placed on literature published between 1993–2005.

TL;DR: In the recent years, the organotrifluoroborates chemistry has received special attention mainly by organic chemistry community as mentioned in this paper, mainly due to their great versatility in some reactions, i.e., metal-catalyzed reactions.

TL;DR: In this paper, a green approach for efficient and rapid synthesis of polyhydroquinoline derivatives via unsymmetric Hantzsch reaction using organocatalysts at room temperature was reported.

TL;DR: In this paper, a simple and efficient one-pot three-component synthesis of the biologically important spirooxindoles scaffold was carried out by the reaction of isatin, activated methylene reagent, and 1,3-dicarbonyl compounds in aqueous medium.

TL;DR: The methods used for the synthesis of vicinal diary-substituted 1 H -imidazole derivatives are reviewed in this paper, which contains 519 references and summarizes the biological properties of some of these heterocycles.

TL;DR: From this perspective, life’s origin is seen as a seamless transition from self-ordering chemical reactions to self-sustaining chemical systems that are capable of Darwinian evolution.

TL;DR: In this paper, a nanosized magnesium oxide catalyzed three-component condensation reaction of aldehyde, malononitrile, and α-naphthol was conducted in water-pEG to afford corresponding 2-amino-2-chromenes.

TL;DR: The JK-25 sensitized cell gave a short circuit photocurrent density (J sc ) of 11.50 µm −2, an open circuit voltage (V oc ) of 0.68 ǫV, a fill factor of 1.66, corresponding to an overall conversion efficiency of 5.15%, and the maximum incident monochromatic photon-to-current conversion efficiency (IPCE) of 77% at 430 nm as mentioned in this paper.

TL;DR: In this paper, the authors present a review of catalytic systems containing chiral sulfur ligands that have been applied in asymmetric catalysis from 1999 to 2006, showing that chiral sulfide-containing ligands represent a potential class of ligands to be applied in a considerable number of reactions, and that they have some peculiar properties which differentiate them from more popular ligands such as those of phosphorus.

TL;DR: The protocol for the synthesis of 2-arylazoles involving the use of aryl iodides has been found to be suitable for the efficient preparation of three bioactive compounds and a key intermediate in the synthesisation of a heparanase inhibitor.

TL;DR: In this paper, the formation of medium-ring heterocycles by catalytic diene and enyne metathesis reactions has been reviewed and 181 references have been provided, including 181 references from Wikipedia.

TL;DR: In this article, a simple and efficient method for the one-pot three-component synthesis of new spirooxindoles under conventional and solvent-free microwave irradiation is described. But this method requires the use of a large number of components.

TL;DR: In this paper, two new organic dyes, JK-16 and JK17 containing bis-dimethylfluorenyl amino benzo[ b ]thiophene are designed and synthesized.

TL;DR: A review of the chemistry of 1,2,4,5-tetrazine and its derivatives in the last 10 years for the period 1996-2006 can be found in this paper.

TL;DR: In this paper, the authors reported that N-alkyl-4-boronopyridinium halides are more effective catalysts than the previous ones in more polar solvents.

TL;DR: In this paper, aldehydes were converted to 2-imidazolines and 2-oxazoline in good yields by the reaction with ethylenediamine and aminoethanol, respectively, using molecular iodine and potassium carbonate.

TL;DR: A variety of fatty acid amides of different naturally occurring L-amino acids have been synthesized and they are found to form gels with various hydrocarbons as mentioned in this paper.

TL;DR: Most Pd procedures require chelation of the Pd atom by the substrate to afford selective anti-Markovnikov oxidation as discussed by the authors, and most of the chelation procedures require the substrate substrate to have a high level of Pd tolerance.