References of "Dupont, Léon"
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See detailSynthèse, étude théorique et évaluation biologique de dérivés du 4-amino-4H-1,2,4-triazole analogues des antibiotiques b-lactamiques
Pirotte, Bernard ULg; Dive, Georges ULg; Delarge, Jacques et al

in European Journal of Medicinal Chemistry (1992), 27(3), 193-205

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See detailNew alkoxypyridine Sulfonamides: Synthesis, Biological Evaluation and Physicochemical Properties
Liégeois, Jean-François ULg; Dive, Georges ULg; Dupont, Léon et al

in Helvetica Chimica Acta (1991), 74(8), 1764-1772

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See detailRevision of the Structure of Strychnochromine
Quetin-Leclercq, Joëlle; Angenot, Luc ULg; Dupont, Léon et al

in Tetrahedron Letters (1991), 32(34), 4295-4298

The structure of strychnochromine, an unusual alkaloid isolated from a new batch of the root bark of Strychnos gossweileri has been revised . To confirm the indoline structure ( proposed in 1988) and to ... [more ▼]

The structure of strychnochromine, an unusual alkaloid isolated from a new batch of the root bark of Strychnos gossweileri has been revised . To confirm the indoline structure ( proposed in 1988) and to establish the stereochemistry of the compound extensive 2D-NMR experiments were carried out. The COSY experiments mostly confirmed the previous observations but the COLOC maps did not fit the first proposed structure!The problem was solved by single-crystal X-ray analysis of the p-bromobenzoyl ester of strychnochromine. The new structure, with its tetrahydroquinoline ring, is very unusual in Strychnos species but the formation of quinolines from indole alkaloids has already mentioned in some other plants ( Cinchona, Alstonia, Hunteria..). [less ▲]

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See detailIsolation and Purification of Panarine, a Quaternary Alkaloid from a Venezuelian Curare
Quetin-Leclercq, Joëlle; Angenot, Luc ULg; Dupont, Léon et al

in Phytochemistry (1988), 27(12), 4002-4004

High Speed Counter Current Chromatography (HSCCC) has been used to isolate and purify two quaternary alkaloids from a sample of curare prepared by the Panare Indians of Estado Bolivar, Venezuela. One of ... [more ▼]

High Speed Counter Current Chromatography (HSCCC) has been used to isolate and purify two quaternary alkaloids from a sample of curare prepared by the Panare Indians of Estado Bolivar, Venezuela. One of the compounds is the known base Macusine B. The other one is a new but related base named panarine. Its structure has been established unequivocally by spectral and X-ray cristallographic analysis. [less ▲]

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See detailAcide cyclohexyl-4 naphtalène-1-propionique
Dupont, Léon; Dideberg, Otto; Dive, Georges ULg et al

in Acta Crystallographica. Section B-Structural Crystallography and Crystal Chemistry (1982), 38(9), 2409-2411

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See detailStructure de l'hydrogénonitrate de l'isopropyl-1 {[(pipéridyl-1 amino)-4 pyridyl-3]sulfonyl}-3 urée
Dupont, Léon; Dideberg, Otto; Delarge, Jacques et al

in Acta Crystallographica. Section B-Structural Crystallography and Crystal Chemistry (1982), 38(5), 1495-1500

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See detailTorasemide: a comparison of two refinement computer programs and effects on CNDO/2 calculations
Dupont, Léon; Dive, Georges ULg

in Extrait du Bulletin de la Société Royale des Sciences de Liège (1982), 5-8

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See detailTetrakis(propylthio)-2,2,6,6' azoxy-3,3' pyridine
Lamotte, Josette; Dupont, Léon; Dideberg, Otto et al

in Acta Crystallographica. Section B-Structural Crystallography and Crystal Chemistry (1980), 36

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See detailThe 4.5 Å resolution structure analysis of the exocellular DD-carboxypeptidase of Streptomyces albus G.
Dideberg, Otto; Charlier, Paulette ULg; Dupont, Léon et al

in FEBS Letters (1980), 117(1), 212-214

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See detailStructure d'un nouvel alcaloïde bisindolinique: complexe moléculaire 1:1 Sungucine-Acétone
Dupont, Léon; Dideberg, Otto; Lamotte, Josette ULg et al

in Acta Crystallographica. Section B-Structural Crystallography and Crystal Chemistry (1980), B 36

Sungucine ( found only in Strychnos icaja ) represents a new type of bisindolinic alkaloid with an unusual C(23)-C(5') bond between the two parts of the molecule, which have the same stereochemistry. Ring ... [more ▼]

Sungucine ( found only in Strychnos icaja ) represents a new type of bisindolinic alkaloid with an unusual C(23)-C(5') bond between the two parts of the molecule, which have the same stereochemistry. Ring D (and D') is almost in a boat conformation and C(2)-C(16) is cis. There are only van der Waals interactions in the orthorombic crystals of the molecular complex 1:1 sungucine-acetone. [less ▲]

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See detailIsolation and structure of sungucine, a new type of bisindoline alkaloid
Lamotte, Josette ULg; Dupont, Léon; Dideberg, Otto et al

in Tetrahedron Letters (1979), (43), 4227-4228

From the roots of Strychnos icaja BAILLON, an unsymmetrical dimeric alkaloid has been isolated and called sungucine. Its original structure has been established by X-Ray diffraction; UV,IR,MS and NMR data ... [more ▼]

From the roots of Strychnos icaja BAILLON, an unsymmetrical dimeric alkaloid has been isolated and called sungucine. Its original structure has been established by X-Ray diffraction; UV,IR,MS and NMR data are also given. [less ▲]

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See detailStructure cristalline et moléculaire d'un nouvel alclaoïde bisindolique: complexe moléculaire 1:2 Strychnofoline-Ethanol
Dideberg, otto; Lamotte-Brasseur, Josette ULg; Dupont, Léon et al

in Acta Crystallographica. Section B-Structural Crystallography and Crystal Chemistry (1977), B33

Strychnofoline is a phenolic alkaloid isolated from leaves of Strychnos usambarensis. The crystals of the complex Strychnofoline-Ethanol are monoclinic. the crystal structure has been solvad by direct ... [more ▼]

Strychnofoline is a phenolic alkaloid isolated from leaves of Strychnos usambarensis. The crystals of the complex Strychnofoline-Ethanol are monoclinic. the crystal structure has been solvad by direct methods. The configuration determined by biogenetic arguments is 3S?4R?7S?15S?17S?20R. This is the first oxindole alkaloid found in a Strychnos species. [less ▲]

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See detailStructure Cristalline et Moléculaire de la Picrotoxine, C15H16O6.C15H18O7
Dupont, Léon; Dideberg, Otto; Lamotte, Josette ULg et al

in Acta Crystallographica. Section B-Structural Crystallography and Crystal Chemistry (1976), B32(11), 2987-2993

Picrotoxin is the toxic constituent of Anamirta cocculus fruits. Crystals of picrotoxin are monoclinic and are an addition component of two almost identical molecules :picrotoxinin, C15H16O6, and picrotin ... [more ▼]

Picrotoxin is the toxic constituent of Anamirta cocculus fruits. Crystals of picrotoxin are monoclinic and are an addition component of two almost identical molecules :picrotoxinin, C15H16O6, and picrotin, C15H18O7.The structure of each molecule is compared with the crystal structure of alpha1-bromopicrotoxinin. [less ▲]

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See detailStructure cristalline et moléculaire d'un nouvel alcaloïde indolique, l'Akagérine: C20H24N2O2
Dupont, Léon; Dideberg, Otto; Angenot, Luc ULg

in Acta Crystallographica. Section B-Structural Crystallography and Crystal Chemistry (1975), B31(10), 2378-2383

Akagerine is a new alkaloid first isolated by one of us (LA) from roots of Strychnos usambarensis. The crystal structure was determined by direct methods from three-dimensional diffractometer data. The ... [more ▼]

Akagerine is a new alkaloid first isolated by one of us (LA) from roots of Strychnos usambarensis. The crystal structure was determined by direct methods from three-dimensional diffractometer data. The crystals are tetragonal. The absolute configuration was not determined. This is the first report of a seven-membered ring with an N1-C17 bond (conventional notation for indole alkaloid). The lone-pair of electrons on N4 is cis with respect to C(3)H and C(15)H.The cohesion of the structure is the result of one hydrogen bond OH...N (2.77O Angstroem) and van der Waals interactions. [less ▲]

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See detailDétermination de la Structure Cristalline et de la Configuration Absolue du Bromhydrate d'Usambarensine
Dideberg, Otto; Dupont, Léon; Angenot, Luc ULg

in Acta Crystallographica. Section B-Structural Crystallography and Crystal Chemistry (1975), B31(6), 1571-1575

Usambarensine is a bisindolinic alkaloid found in the bark of Strychnos usambarensis roots. The crystal and molecular structure of usambarensine.2HBr.2H2O has been solved by direct methods thanks to a ... [more ▼]

Usambarensine is a bisindolinic alkaloid found in the bark of Strychnos usambarensis roots. The crystal and molecular structure of usambarensine.2HBr.2H2O has been solved by direct methods thanks to a Hilger-Watts four-circle diffractometer. The crystals are monoclinic; refinement of the parameters was carried out with 2459 reflexions. The absolute configuration of the molecule, determined by X-ray anomalous scattering, confirms the 3 alpha cis configuration ( 11alpha cis, IUPAC) assigned earlier by spectral, chromatographic and biogenetic data.This configuration seems dependent on the presence of an ethylidenic chain in the corynane part of the molecule. [less ▲]

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See detailIsolation and structure of akagerine: a new type of indole alkaloid
Angenot, Luc ULg; Dideberg, Otto; Dupont, Léon

in Tetrahedron Letters (1975), (16), 1357-1358

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