Zobrazeno 1 - 10
of 32
pro vyhledávání: '"Stephane Laval"'
Publikováno v:
The Journal of Organic Chemistry. 83:2601-2610
Four representative Δ20-ginsenosides, namely, ginsenosides Rh4 (1), (20E)-Rh3 (2), Rg6 (3), and Rk1 (4) from Panax Ginseng, were chemically synthesized for the first time. Dehydration of the naturally occurring 20(S)-protopanaxatriol and 20(S)-proto
Publikováno v:
The Journal of Organic Chemistry. 81:10279-10294
A total of 14 ocotillol-type ginsenosides were conveniently synthesized employing glycosylation of ocotillol sapogenin derivatives with glucosyl ortho-alkynylbenzoate donors under the promotion of a gold(I) catalyst as the key step. Relying on a rati
Publikováno v:
Organic Chemistry Frontiers. 3:103-109
The synthesis of well-defined fragments of heparin (HP) and heparan sulfate (HS) is often hampered by difficult post-assembly manipulations on the fully elaborated oligosaccharides. In particular, the O- and N-sulfonation steps, usually performed sep
Publikováno v:
The Journal of organic chemistry. 83(13)
Disaccharide nucleoside antibiotics plicacetin and streptcytosine A (also named rocheicoside A) were effectively synthesized through the common precursor cytosamine. The amosamine and amicetose moieties were efficiently assembled through an α-select
Publikováno v:
The Journal of organic chemistry. 83(5)
Four representative Δ
Publikováno v:
Asian Journal of Organic Chemistry. 4:1034-1039
The efficacy of the heterogeneous polystyrene-bound triphenylphosphine gold(I) catalyst 3 (PS-[Ph3PAuINTf2]; PS=polystyrene; Tf=trifluoromethanesulfonyl) in the activation of glycosyl ortho-hexynylbenzoates for glycosylation is demonstrated. The shel
Publikováno v:
Synthesis. 46:1030-1045
An overview of flavonoid glycoside synthesis has been provided with an emphasis on the construction of the glycosidic linkages. 1 Introduction 2 Synthetic Tactics 3 Synthesis of Flavonoid O-Glycosides 3.1 Glycosylation with Glycosyl Bromides 3.2 Glyc
Autor:
Estelle Métay, Wissam Dayoub, Leyla Pehlivan, Dominique Delbrayelle, Gerard Mignani, Stephane Laval, Marc Lemaire, Alain Favre-Réguillon
Publikováno v:
Tetrahedron. 70:975-983
1,1,3,3-Tetramethyldisiloxane (TMDS) and polymethylhydrosiloxane (PMHS), when associated with titanium(IV) isopropoxide, provide two convenient systems for the reduction of nitriles into the corresponding primary amines. Kinetics of the two systems h
Publikováno v:
BioFactors (Oxford, England). 42(5)
Mangiferin (2C-β-d-glucopyranosyl-1,3,6,7-tetrahydroxyxanthone) is a xanthone C-glycoside occurring in many plant species. Composed of a glucose unit C1→2 linked to a 1,3,6,7-tetrahydroxyxanthone aglycone, mangiferin exhibits a wide range of biolo
Autor:
Leyla Pehlivan, Marc Lemaire, Alain Favre-Réguillon, Gerard Mignani, Estelle Metay, Wissam Dayoub, Dominique Delbrayelle, Stephane Laval
Publikováno v:
Tetrahedron Letters
Tetrahedron Letters, Elsevier, 2011, 52 (32), pp.4072-4075. ⟨10.1016/j.tetlet.2011.05.109⟩
Tetrahedron Letters, Elsevier, 2011, 52 (32), pp.4072-4075. ⟨10.1016/j.tetlet.2011.05.109⟩
International audience; A simple and useful method for the reduction of primary amides into the corresponding amines using a polymethylhydrosiloxane (PMHS)–Ti(OiPr)4 reducing system is described. Aromatic as well as aliphatic primary amides are red