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Journals and Conferences
Lignin is by far the most abundant substance based on aromatic moieties in nature, and the largest contributor to soil organic matter. Millions of tonnes of several lignin preparations are produced by the paper industry every year, and a minimal amount of lignin is isolated by direct extraction of lignin from plants. Lignin is used either directly or… (More)
A set of regioisomeric pairs of tricyclic hydroquinones, analogues of antitumor 9,10-dihydroxy-4,4-dimethyl-5,8-dihydroanthracen-1(4H)-one (1) and other derivatives, were synthesized and their regiochemistry and NMR spectra assigned by using (1)H-detected one-bond (C-H) HMQC and long-range C-H HMBC, in good agreement with theoretical O3LYP/Alhrichs-pVTZ… (More)
Green chemistry has developed mathematical parameters to describe the sustainability of chemical reactions and processes, in order to quantify their environmental impact. These parameters are related to mass and energy magnitudes, and enable analyses and numerical diagnoses of chemical reactions. The environmental impact factor (E factor), atom economy, and… (More)
The reactivity of 2-deoxy-2-iodoglycosyl isothiocyanates toward O- and S-nucleophiles gives an easy access to 2-deoxy-2-iodoglycopyranosyl thiocarbamates and dithiocarbamates. Internal nucleophilic displacement of the iodine by the sulfur atom in these compounds allows the preparation of glycopyranoso[1,2-d]-1,3-thiazoles and… (More)
Cell surface glycolipid and glycoprotein oligosaccharides are known to play important roles in many biological events such as cellular recognition, adhesion and cell growth regulation. A major class of glycoprotein oligosaccharides consists of N-linked oligosaccharides which are linked to asparagine by an amide bond.[1,2] Glycosylamines are important… (More)
[reaction: see text] The construction of multivalent neoglycoconjugates is efficiently achieved by the regiospecific catalytic cycloaddition of alkynes and azides using the organic-soluble copper complexes (Ph(3)P)(3).CuBr and (EtO)(3)P.CuI. The simultaneous use of microwave irradiation shortened notably the reaction times.
The construction of multivalent structures such as sugar heterodimers, glycoclusters, calix sugars, multicalixarenes, and glycocyclodextrins is designed by using 1,3-dipolar cycloaddition as a versatile and efficient tool which allows the creation of heterocyclic bridges between the different units that are coupled.
The synthesis of disaccharides containing sulfur in the reducing ring through a nonglycosylating chemical strategy is described. Lactose, maltose and cellobiose were transformed in several steps into the appropriately protected 4-O-glycosyl-2,3-O-isopropyliden-aldehydo-d-glucose dimethyl acetals (6, 11, 18 and 27) and… (More)
Absfract: Cyclic sulfates 21-23 and sulfite 27 derived from glucofuranose lead to the 3,6_anhydrosugar 28 in excellent yields when treated with sodium sulfite or in basic media. When treated with sodium sulfite, the 3-deoxy derivative 24 fails to give the intramolecular cyclization which leads to the anhydrosugars. Instead it gives the disulfonate… (More)
Regioselective acylation of cyclomalto-oligosaccharides was achieved using pivaloyl and diphenylacetyl chlorides. The reaction of cyclomaltohexaose (1) with pivaloyl chloride gave the hexakis(2,6-di-O-pivaloyl) derivative 19 in 66% yield. Similar reaction with cyclomalto-heptaose (2) led to the octakis(2I,6I,6II,6III,6IV,6V,6VI ,6VII-O-pivaloyl) 26 and the… (More)