SYNTHESIS OF A MANNOTETRAOSE—THE REPEATING UNIT OF THE CELL-WALL MANNANS OF MICROSPORUM GYPSEUM AND RELATED SPECIES OF TRYCHOPHYTON
摘要:
A tetrasaccharide, alpha -D-mannopyranosyl-(1 -->2)-alpha -D-mannopyranosyl-(1 -->6)-alpha -D-mannopyranosyl-(1 -->6)-D-maanopyranose (1), the repeating unit of the cell-wall mannans of Microsporum gypseum and related species of Trychophyton, was synthesized using 6-O-acetyl-2,3,4-tri-O-benzoyl-alpha -D-mannopyranosyl trichloroacetimidate (5) and 2-O-acetyl-3,4,6-tri-O-benzoyl-alpha -D-mannopyranosyl trichloroacetimidate (13) as the glycosyl donors in "the inverse Schmidt 'procedure.
Unexpected Stereocontrolled Access to 1α,1′β-Disaccharides from Methyl 1,2-Ortho Esters
作者:Clara Uriel、Juan Ventura、Ana M. Gómez、J. Cristóbal López、Bert Fraser-Reid
DOI:10.1021/jo202335n
日期:2012.1.6
Mannopyranose-derived methyl 1,2-orthoacetates (R = Me) and 1,2-orthobenzoates (R = Ph) undergo stereoselective formation of 1 alpha,1'beta-disaccharides, upon treatment with BF3 center dot Et2O in CH2Cl2, rather than the expected acid-catalyzed reaction leading to methyl glycosides by way of a rearrangement-glycosylation process of the liberated methanol.
SYNTHESIS OF A MANNOTETRAOSE—THE REPEATING UNIT OF THE CELL-WALL MANNANS OF <i>MICROSPORUM GYPSEUM</i> AND RELATED SPECIES OF <i>TRYCHOPHYTON</i>
作者:Linsen Heng、Jun Ning、Fanzuo Kong
DOI:10.1081/car-100104864
日期:2001.4.30
A tetrasaccharide, alpha -D-mannopyranosyl-(1 -->2)-alpha -D-mannopyranosyl-(1 -->6)-alpha -D-mannopyranosyl-(1 -->6)-D-maanopyranose (1), the repeating unit of the cell-wall mannans of Microsporum gypseum and related species of Trychophyton, was synthesized using 6-O-acetyl-2,3,4-tri-O-benzoyl-alpha -D-mannopyranosyl trichloroacetimidate (5) and 2-O-acetyl-3,4,6-tri-O-benzoyl-alpha -D-mannopyranosyl trichloroacetimidate (13) as the glycosyl donors in "the inverse Schmidt 'procedure.
The Chemical Synthesis of Bioactive Glycosylphosphatidylinositols fromTrypanosoma cruzi Containing an Unsaturated Fatty Acid in the Lipid
作者:Dmitry V. Yashunsky、Vladimir S. Borodkin、Michael A. J. Ferguson、Andrei V. Nikolaev