3-O-a-L-arabinofuranosyl

Virgilia oroboides gum contains a complex array of peripheral units, and controlled, partial hydrolysis with acid affords the disaccharides 5-O-a-L-arabinopyranosyl-L-arabinofuranose (29), 5-O-a-L-arabino-furanosyl-L-arabinofuranose (57), and 5-0-/3-D-xylopyranosyl-L-ara-binofuranose (35), together with traces of oligosaccharides to which the structures 3-O-a-L-arabinofuranosyl-L-arabinose (25) and O-a-L-arabinopyranosyl-(l - 5)-0-L-arabinofuranosyl-(l - 5)-L-arabino-furanose (58) have been assigned. 

In addition to the approach outlined in Scheme 4, several other approaches to the synthesis of glycofuranosides have been reported during the past year. Hanessian and Banoub have used cyclic amide acetals derived from vicinal diols as the source of the aglycone in condensations with l-0-acetyl-2,3,5-tri-0-benzoyl-jS-D-ribofuranose in the presence of stannic chloride (Scheme 5). Disaccharide derivatives are obtained when the cyclic amide acetal is derived from carbohydrate vicinal diols (Scheme 6), and selective methanolysis of the formate ester exposed an hydroxy-group that can be subjected to further manipulation or glycosylation. 2,3,5-Tri-0-benzoyl-a)8-L-arabinofuranosyl bromide or chloride has been condensed with 4-nitrophenyl 2,3-di-O-acetyl-a-L-arabinofuranoside to yield, after deacylation, 4-nitrophenyl 5-O-a-L-arabinofuranosyl-a-L-arabino-furanoside, with jS-peltatin A [isolated from podophyllin Podophyllum peltatum)] in glycosidation of the phenolic 8-OH group in an attempt to reduce... 

Methyl 3,5-di-O-a-L-arabinofuranosyl-a-L-arabinofuranoside, which is the core unit of naturally occurring arabinans, has been described. ... 

Gorin176 studied the Koenigs-Knorr reaction of 2-O-substituted 3,5-di-O-benzoyl-a-L-arabinofuranosyl (108) and -D-ribofuranosyl (111) bromide with methanol and l,2,3,4-tetra-0-acetyl-/3-l>glucopyranose (see Table IV). Compound 108 gave the 1,2-orthoester 109 plus the glycoside 110, and bromide 111 gave the 1,2-orthoester 112 plus the glycoside 113. 

To prepare the a anomer (60) of the aminonucleoside [ namely, 9-(3-amino-3-deoxy-)8-D-ribofuranosyl)-iV , lV -dimethyladenine], 9-(3-ac-etamido-3-deoxy-a-D-arabinofuranosyl) -JV , iV -dimethyl-2- (methylthio) -adenine (59) was prepared by condensation of the titanium chloride complex of 3-acetamido-l-0-acetyl-2,5-di-0-benzoyl-3-deoxy-arabinofuranose with iV ,iV -dimethyl-2-(methylthio)adenine, followed by desulfurization and de-O-acylation. The inversion of the hydroxyl group on C-2 by way of its methylsulfonyl ester then gave the desired a anomer (60) of the aminonucleoside, isolated as its vanillylidene derivative. " The A-acetyl... 

O -p-D-Xylopyranosyl-D-allose, X-20 6-0-p-D-Xylopyranosyl-2-amino-2-deoxy-D-glucose, X-21 a-D-Xylopyranosyl-(l 3)-a-L-arabinofuranosyl-(l ->3)-L-arabinose, X-22 p-D-Xylopyranosyl-(l ->3)-a-L-arabinofuranosyl-(l ->3)-L-arabinose, X-23 p-D-Xylopyranosyl-(l ->5)-a-L-arabinofuranosyl-(l ->3)-L-arabinose, X-24 p-D-Xylopyranosyl-(l ->5)-a-L-arabinofuranosyl-(l ->5)-L-arabinose, X-25 p-D-Xylopyranosyl-(l ->3)-a-L-arabinopyranosyl-(l ->4)-[p-D-apiofuraiiosyl-... 

Benzyl 2-0-a-L-arabinofuranosyl-p-L-arabinopyranoside, 8CI, A-801 Benzyl 5- O -benzoyl-3- O -benzyl-2- O -(2,3,5-tri- O -benzoyl- p-D-ribofuranosyl)- p-D-ribofuranoside, R-120 Benzyl 4- O -(3- O -benzoyl-2,4-di- O -benzyl-a-D-xylopyranosyl)-2,3-di- 0 -benzyl-a-D-xylopyranoside, X-77 Benzyl 3-0-benzyl-4-O -(2,3,4,6-tetra-O -benzyl-a-D-glucopyranosyl)-p-D-xylopyranoside, G-473... 

Chaturvedi SK, Saxena VK (1984) P-Sitosterol-3-O-P-D-arabinofuranosyl-O-a-L-rhamnopyianosyl-O-P-D-glucopyranoside from roots of Streblus asper Lour. Acta Ciencia IndicaChem 10 122—123... 

Bacopasaponin F 3-0-[P-D-glucopyranosyl-(l 3)- a-L-arabinofuranosyl-(l — 2) -P-d-glucopyranosyl]-20-O-(a-L-arabinopyranosyl) jujubogenin... 

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