Showing papers in "Tetrahedron in 2002"

TL;DR: In this article, a method for examining boronate ester stability using the fluorescent reporter Alizarin Red S was developed, which was used to determine the binding constants of a series of diols, and as a basis from which to derive a number of relationships that correlate the various equilibrium constants in the literature.

TL;DR: The global electrophilicity power, ω, of a series of dienes and dienophiles commonly used in Diels-Alder reactions may be conveniently classified within a unique relative scale as discussed by the authors.

TL;DR: In this article, a new protocol for the Biginelli reaction was proposed, which produces excellent yields, allows the recycling of catalyst with no loss in its activity, and leads to zero-discharge during the process.

TL;DR: In this article, the formation, structure and behavior of fluorous nano- and microphases in colloidal systems are analyzed from the perspective of the formation and structure of fluoric nano-and micro-phases, i.e., domains with at least one dimension in the nanometer range.

TL;DR: The development of the title discipline is briefly summarized in this paper, and the general topics of the articles in this issue introduced. Definitions are proposed for the terms "fluorous" and "fluoric medium" for the concepts of "fluoride" and 'fluoric reaction component'.

TL;DR: In this paper, four novel isoquinoline alkaloids, crispine B-, crispine C and crispine E, along with a new natural iso-quinoline alkyloid, crispines A and B, were isolated from Carduus crispus, and the structures were elucidated on the basis of spectroscopic data.

TL;DR: In this article, two strategies for the generation of molecular complexity in a resource-effective manner were explored, one involving multicomponent reactions and the other involving reactions leading to multiple carbon-carbon bond formation through tandem processes.

TL;DR: In this paper, the synthesis of amides via pyrolysis of the salts obtained by mixing primary amines and carboxylic acids was realized under solvent-free conditions within short times and appreciable yields under microwave activation.

TL;DR: In this paper, the direct condensation of equimolar amounts of carboxylic acids and alcohols could be achieved using hafnium (IV) or zirconium(IV) salts.

TL;DR: In this article, the secondary-tertiary diamine series is shown to be effective with regard to reactivity and selectivity in the catalytic asymmetric direct aldol reaction of three different aldehydes.

TL;DR: Indium trichloride and indium triflate were found to be effective catalysts for the acetylation of indoles to 3-acetyl indoles and was reported for the first time in good yield as discussed by the authors.

TL;DR: In this paper, a copper(I) catalysed and TEMPO mediated fluorous biphasic oxidation of primary, secondary, allylic and benzylic alcohols with oxygen in the presence of a bipyridine ligand bearing perfluorinated ponytails is described.

TL;DR: In this article, 4-thiazolidinones have been assembled by DCC mediated three-component reaction of amine, aldehyde and mercaptoacetic acid.

TL;DR: In this paper, the 1,4 hydrosilation of a variety of simple α,β-unsaturated enones as catalyzed by B(C 6 F 5 ) 3 (1-2%) is described.