190367-07-8Relevant academic research and scientific papers
Design and synthesis of unnatural heparosan and chondroitin building blocks
Bera, Smritilekha,Linhardt, Robert J.
experimental part, p. 3181 - 3193 (2011/06/24)
Triazole linked heparosan and chondroitin disaccharide and tetrasaccharide building blocks were synthesized in a stereoselective manner by applying a very efficient copper catalyzed azide-alkyne cycloaddition (CuAAC) reaction of appropriately substituted
Acylation of carbohydrates over Al2O3: Preparation of partially and fully acylated carbohydrate derivatives and acetylated glycosyl chlorides
Tiwari, Pallavi,Misra, Anup Kumar
, p. 339 - 350 (2007/10/03)
Selective and per-O-acylation of carbohydrate derivatives using acyl chlorides and Al2O3, a solid support reagent, is reported. This protocol does not require the addition of any base or activator. This methodology has been further extended to the selective acylation of carbohydrate diols and the one-pot preparation of acetylated glycosyl chlorides direct from free reducing sugars. The yields obtained in most of the cases are excellent.
Prearranged glycosides, 9. - Chemical synthesis of a tetrasaccharide fragment related to the exopolysaccharide of Arthrobacter sp. CE-17
Lemanski, Gregor,Ziegler, Thomas
, p. 181 - 186 (2007/10/03)
The tetrasaccharide 5-aminopentyl glycoside β-D-Manp-(1→4)-β-D-Glcp- (1→4)-α-L-Rhap-(1→3)-β-D-Glcp-1-O-(CH2)5NH2(22) related to the exopolysaccharide of Arthrobacter sp. CE-17 was synthesized by coupling of the properly protected disaccharide blocks β-D-Manp-(1→4)-β-D-Glcp-1-S-Ph (11) and α-L-Rhap-(1→3)-β-D-Glcp-1-O-(CH2)5NHZ (20). Building block 11 was obtained by intramolecular β-mannosylation of a malonyl-tethered disaccharide glycoside which was prepared from phenyl 4,6-O-benzylidene-1- thio-β-D-glucopyranoside (1) and ethyl 2,3,4-tri-O-benzyl-1-thio-α-D- mannopyranoside (5) in 5 steps. Building block 20 was obtained by coupling N- Z-protected 5-aminopentyl 2-O-benzyl-4,6-O-benzylidene-β-D-glucopyranoside (14) obtained from the non-benzylated counterpart 12 with ethyl 2,3-di-O- benzoyl-4-O-chloroacetyl-1-thio-α-L-rhamnopyrano- side (18) obtained in 3 steps from ethyl 2,3-O-isopropylidene- 1-thio-α-L-rhamnopyranoside (15).
Silylmethylene radical cyclization. A stereoselective approach to branched sugars
Pedretti, Valerie,Mallet, Jean-Maurice,Sinay, Pierre
, p. 247 - 258 (2007/10/02)
Ethyl 6-O-benzyl-2,3-dideoxy-α-D-erythro-hex-2-enopyranoside (2) was converted, in three steps and in 73percent overall yield, into ethyl 6-O-benzyl-2,3-dideoxy-3-C-(hydroxymethyl)-α-D-ribo-hex-2-enopyranoside.This transformation involved silylation of 2
