Total syntheses of two natural sulphoglycolipids, disulphated glycosphingolipid SB1a and the structurally related monosulphated SM1a, are described. They have common glycan sequences and ceramide moieties and are associated with humanepithelialcarcinomas. The syntheses featured efficient glycan assembly and the glucosyl ceramide cassette as a versatile building block. The binding of the synthetic
The wheat glycosphingolipids, O-(beta-D-mannopyranosyl-[(1-->4)-O-(beta-D-mannopyranosyl)]n-O-(beta-D -glucopyranosyl)-(1-->1)-(2S,3S,4R)-4-hydroxy-N-tetracosanoylsphingan ine (n = 1 and 2), were stereoselectively synthesized. Silver silicate promoted glycosylation when 4-O-acetyl-2,3,6-tri-O-benzyl-alpha-D-mannopyranosyl bromide was used for elongating the glycan chains, which were latter coupled
Agelasphin-9b, (2S,3S,4R)-1-O-(alpha-D-galactopyranosyl)-16-methyl-2-[N-((R)-2-hydroxytetracosanoyl)-amino]-1,3,4-heptadecanetriol, is a potent antitumor agent isolated from the marine sponge Agelas mauritianus. Various analogues of agelasphin-9b (a lead compound) were synthesized, and the relationship between their structures and biological activities was examined using several assay systems. From the results, KRN7000, (2S,3S;4R)-1-O-(alpha-D-galactopyranosyl)2-(N-hexacosanoylamino)-1,3,4-octadecanetriol, was selected as a candidate for clinical application.
KOIKE, KATSUYA;NAKAHARA, YOSHIAKI;OGAWA, TOMOYA, AGR. AND BIOL. CHEM., 54,(1990) N, C. 663-667