2,2′-N:3,3′-O-Tetrakis[(R)-3-hydroxytetradecanoyl]-β(1-6)-D-glucosamine disaccharide 1,4′-bis(phosphate) and its dephospho derivatives were synthesized. The bisphosphate prepared was shown to be identical with a natural biosynthetic precursor of lipid A which corresponds to the lipophilic part of lipopolysaccharide (LPS) in bacterial cell wall. The synthetic bis- and monophosphates exhibited many of
2,2'-N:3,3'-O-Tetrakis[(R)-3-羟基十四烷酰基]-β(1-6)-D-葡糖胺二糖 1,4'-双(磷酸)及其脱磷衍生物合成的。制备的二磷酸盐显示与脂质 A 的天然生物合成前体相同,脂质 A 对应于细菌细胞壁中脂多糖 (LPS) 的亲脂部分。合成的双磷酸盐和单磷酸盐表现出 LPS 的许多典型内毒活性。因此,这项工作建立了脂质 A 生物合成前体的化学结构,并阐明了表达这些活性所需的基本结构。
Divergent synthesis and biological activities of lipid A analogues of shorter acyl chains
by 1-O-phosphorylation and subsequent deprotection by afforded the desired lipid A analogues. The present divergent route opens an efficient way toward the synthesis of lipid A libraries. Biological tests (inhibition of IL-6 induction) clearly showed the critical importance of the chain length of the acyl moieties in lipid A to the activity.