References of "Tetrahedron Letters"
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See detailGreen synthesis and antioxidant activity of new PEGylated ferulic acids
Nicks, Francois ULg; Richel, Aurore ULg; Richard, Gaetan ULg et al

in Tetrahedron Letters (2012), 53(19), 2402-2405

PEGylation of ferulic acid is described through a green esterification process involving poly(ethylene glycol) (PEG) with three different average molecular weights (200, 400 and 1000 g/mol) as both ... [more ▼]

PEGylation of ferulic acid is described through a green esterification process involving poly(ethylene glycol) (PEG) with three different average molecular weights (200, 400 and 1000 g/mol) as both reactive and solvent. Esterification with PEG400 and PEG1000 leads to original compounds soluble in all proportions in water. These new compounds display an antioxidant activity similar to that of ferulic acid. [less ▲]

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See detailMicrowave-assisted synthesis of D-glucuronic acid derivatives using cost-effective solid acid catalysts
Richel, Aurore ULg; Laurent, Pascal ULg; Wathelet, Bernard ULg et al

in Tetrahedron Letters (2010), 51

Monomode microwave-assisted coupling of D-glucuronic acid with alcohols, in the presence of various impregnated acid catalysts, was successfully performed, affording in almost quantitative yields the ... [more ▼]

Monomode microwave-assisted coupling of D-glucuronic acid with alcohols, in the presence of various impregnated acid catalysts, was successfully performed, affording in almost quantitative yields the corresponding monosubstituted b-D-glucofuranosidurono-6,3-lactones in less than 10 min at 85°C. This study evidences the synergy of microwaves and impregnated acid catalysts as a fast and clean strategy in the field of carbohydrate chemistry. [less ▲]

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See detailFast production of highly concentrated reactive [18F] fluoride for aliphatic and aromatic nucleophilic radiolabelling
Aerts, Joël ULg; Voccia, Samuel; Lemaire, Christian ULg et al

in Tetrahedron Letters (2010), 51

The use of a polymeric solid support loaded with a long alkyl chain quaternary ammonium allows the rapid and efficient recovery of cyclotron produced [18F]F- from [18O]water to a low water content organic ... [more ▼]

The use of a polymeric solid support loaded with a long alkyl chain quaternary ammonium allows the rapid and efficient recovery of cyclotron produced [18F]F- from [18O]water to a low water content organic solution compatible with fast nucleophilic labelling of most precursors for PET radiopharmaceuticals in high yield. [less ▲]

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See detailStraightforward hetero Diels-Alder cycloadditions of nitroso dienophiles by microreactor technology
Monbaliu, Jean-Christophe ULg; Cukalovic, Ana; Marchand-Brynaert, Jacqueline et al

in Tetrahedron Letters (2010), 51

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See detailNovel chiral 1-phosphono-1,3-butadiene for asymmetric hetero Diels-Alder cycloadditions with nitroso and azodicarboxylate dienophiles
Monbaliu, Jean-Christophe ULg; Tinant, Bernard; Peeters, Daniel et al

in Tetrahedron Letters (2010), 51

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See detail(R)-4-phenyloxazolidin-2-thione: an efficient chiral auxiliary for [4+2] cycloaddition of 1-aminodienes and activated phosphonodienophiles
Monbaliu, Jean-Christophe ULg; Robiette, Raphaël; Peeters, Daniel et al

in Tetrahedron Letters (2009), 50

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See detailIs anthracene cofactor or spectator for the thermolysis of anthracenyl acylnitroso cycloadducts in the presence of a diene?
Monbaliu, Jean-Christophe ULg; Marchand-Brynaert, Jacqueline; Peeters, Daniel

in Tetrahedron Letters (2009), 50

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See detail[4+2] Cycloaddition of 1-phosphono-1,3-butadiene with azo- and nitroso-heterodienophiles
Monbaliu, Jean-Christophe ULg; Marchand-Brynaert, Jacqueline

in Tetrahedron Letters (2008), 49

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See detailMicrowave-enhanced ruthenium-catalysed atom transfer radical additions
Borguet, Yannick ULg; Richel, Aurore ULg; Delfosse, Sbastien et al

in Tetrahedron Letters (2007), 48(36), 6334-6338

The first monomode microwave-assisted atom transfer radical additions (ATRA) of carbon tetrachloride to various olefins were successfully performed, affording the adducts with almost quantitative yields ... [more ▼]

The first monomode microwave-assisted atom transfer radical additions (ATRA) of carbon tetrachloride to various olefins were successfully performed, affording the adducts with almost quantitative yields in less than 10 min at 160 'C. (c) 2007 Elsevier Ltd. All rights reserved. [less ▲]

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See detailImidazol(in)ium carboxylates as N-heterocyclic carbene ligand precursors for Suzuki-Miyaura reactions
Tudose, Adriana; Delaude, Lionel ULg; André, Benoît et al

in Tetrahedron Letters (2006), 47(48), 8529-8533

Simple catalysts formed in situ from palladium acetate and a variety of imidazolium and imidazolinium carboxylates and dithiocarboxylates have been screened in the coupling of aryl halides with trans-2 ... [more ▼]

Simple catalysts formed in situ from palladium acetate and a variety of imidazolium and imidazolinium carboxylates and dithiocarboxylates have been screened in the coupling of aryl halides with trans-2-phenylvinylboronic acid. Imidazol(in)ium carboxylates show an excellent activity, which compares to that displayed by the parent imidazol(in)ium chlorides, whereas imidazol(in)ium dithiocarboxylates are poorly efficient. Interestingly, the base employed exerts a profound influence on the trans/cis stereochemistry of the coupling product. (c) 2006 Elsevier Ltd. All rights reserved. [less ▲]

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See detailElectrochemistry as a correlation tool with the catalytic activities in [RuCl2(p-cymene)(PAr3)]-catalysed Kharasch additions
Richel, Aurore ULg; Demonceau, Albert ULg; Noels, Alfred ULg

in Tetrahedron Letters (2006), 47

[RuCl2(p-cymene)] complexes containing triarylphosphine ligands with various substituents at the para position were used to catalyse the atom transfer radical addition of carbon tetrachloride to various ... [more ▼]

[RuCl2(p-cymene)] complexes containing triarylphosphine ligands with various substituents at the para position were used to catalyse the atom transfer radical addition of carbon tetrachloride to various olefins, and their catalytic activities were nicely correlated with their electrochemical parameters. [less ▲]

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See detailA Chemoselective Ligation For The Synthesis Of Amino Acid Derivatives Of Virginiamycin M-1
Nott, Katherine ULg; Dufour, Samuel; Gossele, Francis et al

in Tetrahedron Letters (2005), 46(43),

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See detailStenotarsol, a new terpenoid from Stenotarsus subtilis (Coleoptera : Endomychidae)
Laurent, Pascal ULg; Daloze, Désiré; Braekman, Jean-Claude et al

in Tetrahedron Letters (2005), 46(6), 931-932

Stenotarsol, a new terpenoid alcohol, has been isolated from the beetle Stenotarsus subtilis (Endomychidae). Its structure has been determined on the basis of its spectral properties. Compound 1 ... [more ▼]

Stenotarsol, a new terpenoid alcohol, has been isolated from the beetle Stenotarsus subtilis (Endomychidae). Its structure has been determined on the basis of its spectral properties. Compound 1 represents a new type of terpene skeleton and is the first secondary metabolite reported so far from this family of beetles. [less ▲]

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See detailFormation of upper rim acylated calix[4]arenes using a sacrifici al zinc anode
Louati, Alain; Vataj, Rame; Gabelica, Valérie ULg et al

in Tetrahedron Letters (2005), 46(44), 7499-7502

A straightforward electrosynthetic method is described, which allows upper rim acylation of non-p-halogenated calix[4]-arenes. For example, a solution of tetrapropoxycalix[4]arene 4 was electrolysed in ... [more ▼]

A straightforward electrosynthetic method is described, which allows upper rim acylation of non-p-halogenated calix[4]-arenes. For example, a solution of tetrapropoxycalix[4]arene 4 was electrolysed in the presence of ZnBr2, in an undivided cell fitted with a sacrificial zinc anode using pure acetonitrile as solvent, yielding an organozinc species, which was then treated with acetyl chloride in the presence of a palladium catalyst to afford 5,11-diacety1-25,26,27,28-tetrapropoxycalix[4]arene 5 in ca. 35% yield after workup. (c) 2005 Elsevier Ltd. All rights reserved. [less ▲]

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See detailThe rational design of modified cinchona alkaloid catalysts. Application to a new asymmetric synthesis of chiral chromanes
Merschaert, Alain; Delbeke, Pieter; Daloze, Désiré et al

in Tetrahedron Letters (2004), 45(24), 4697-4701

A new asymmetric synthesis of 2-substituted chiral chromanes has been achieved. The key step is the intramolecular conjugate addition of a phenolic nucleophile on a alpha,beta-unsaturated ester catalyzed ... [more ▼]

A new asymmetric synthesis of 2-substituted chiral chromanes has been achieved. The key step is the intramolecular conjugate addition of a phenolic nucleophile on a alpha,beta-unsaturated ester catalyzed by Cinchona alkaloids. The high ee's obtained with cinchonine and its derivatives have been rationalized by ab initio quantum chemistry calculations of transition state structures. (C) 2004 Elsevier Ltd. All rights reserved. [less ▲]

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See detailNew 1-alk(en)yl-1,3,5-trihydroxycyclohexanes from the Dufour gland of the African ant Crematogaster nigriceps
Laurent, Pascal ULg; Hamdani, Anissa; Braekman, Jean-Claude et al

in Tetrahedron Letters (2003), 44(7), 1383-1386

The Dufour gland of the African ant Crematogaster nigriceps contains a mixture of at least eight 1-heptadec(en)yl- and 1-nonadec(en)yl-1,3,5-trihydroxycyclohexane derivatives, the mono-unsaturated ... [more ▼]

The Dufour gland of the African ant Crematogaster nigriceps contains a mixture of at least eight 1-heptadec(en)yl- and 1-nonadec(en)yl-1,3,5-trihydroxycyclohexane derivatives, the mono-unsaturated components being the major ones (about 65%). They are accompanied by small amounts of (Z,Z)-dienic derivatives (<10%). The structures, the relative and absolute configurations, and the preferred conformation of these new compounds have been established by spectroscopic and chemical methods, whereas the positions of the double bond in the alkenyl chains were determined by DMDS derivatisation followed by linked scan EIMS. [less ▲]

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See detailRuthenium catalysts bearing N-heterocyclic carbene ligands in atom transfer radical reactions
Richel, Aurore ULg; Delfosse, Sébastien ULg; Cremasco, Cédric et al

in Tetrahedron Letters (2003), 44(32), 6011-6015

The catalytic activity of ruthenium-p-cymene complexes bearing N-heterocyclic carbene ligands in atom transfer radical addition (ATRA) or polymerisation (ATRP) strongly depends on the substituents of the ... [more ▼]

The catalytic activity of ruthenium-p-cymene complexes bearing N-heterocyclic carbene ligands in atom transfer radical addition (ATRA) or polymerisation (ATRP) strongly depends on the substituents of the carbene ligand, thereby providing a nice illustration of the importance of organometallic engineering and ligand fine tuning in homogeneous catalysis. (C) 2003 Elsevier Ltd. All rights reserved. [less ▲]

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See detailStrychnohexamine from Strychnos icaja, a naturally occurring trimeric indolomonoterpenic alkaloid
Philippe, Geneviève ULg; Prost, E.; Nuzillard, J. M. et al

in Tetrahedron Letters (2002), 43(18), 3387-3390

A reinvestigation of Strychnos icaja roots has resulted in the isolation, from the EtOAC extract, of one tertiary trisindole alkaloid, named strychnohexamine. Its structure has been investigated by means ... [more ▼]

A reinvestigation of Strychnos icaja roots has resulted in the isolation, from the EtOAC extract, of one tertiary trisindole alkaloid, named strychnohexamine. Its structure has been investigated by means of spectroscopic data interpretation (UV. IR. HRESIMS. 1D and 2D NMR). This is the first time that a natural trimeric indolomonoterpenic alkaloid has been isolated directly from a plant species. This compound is one of the largest alkaloids ever discovered. (C) 2002 Elsevier Science Ltd. All rights reserved. [less ▲]

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See detailChilocorine D, a novel heptacyclic alkaloid from a coccinellid beetle (Chilocorus renipustulatus)
Laurent, Pascal ULg; Braekman, Jean-Claude; Daloze, Désiré et al

in Tetrahedron Letters (2002), 43(42), 7465-7467

Chilocorine D, a new heptacyclic 'dimeric' alkaloid, has been isolated from the coccinellid beetle Chilocorus renipustulatus and its structure determined by 1D and 2D NMR analyses. It is constituted of a ... [more ▼]

Chilocorine D, a new heptacyclic 'dimeric' alkaloid, has been isolated from the coccinellid beetle Chilocorus renipustulatus and its structure determined by 1D and 2D NMR analyses. It is constituted of a hippodamine moiety linked to a modified octahydro-azaacenaphtylene skeleton encompassing a seven-membered ring. [less ▲]

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See detailA biomimetic synthesis of coelenterazine analogs
Devillers, Ingrid; Arrault, Axelle; Olive, Gilles ULg et al

in Tetrahedron Letters (2002), 43(17), 3161-3164

N-(Trifluoroacetyl)dehydrodipeptides 2–3 were coupled to aminomethylene dimethylacetal derivatives 4–5. The resulting pseudo-tripeptides 6 were stepwise deprotected (carbonyl function (7) then amine ... [more ▼]

N-(Trifluoroacetyl)dehydrodipeptides 2–3 were coupled to aminomethylene dimethylacetal derivatives 4–5. The resulting pseudo-tripeptides 6 were stepwise deprotected (carbonyl function (7) then amine function) and in situ cyclized into imidazolopyrazines 1. [less ▲]

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