Synthesis of Rare Deoxy Amino Sugar Building Blocks Enabled the Total Synthesis of a Polysaccharide Repeating Unit Analogue from the LPS of <i>Psychrobacter cryohalolentis</i> K5<sup>T</sup>
作者:Madhu Emmadi、Suvarn S. Kulkarni
DOI:10.1021/acs.joc.8b02037
日期:2018.12.7
K5T strain was reported. Due to the presence of unnatural amino sugars and branched linkages, its structure is unique. Herein we report the total synthesis of an LPS analogue of P. cryohalolentis K5T. After overcoming the issues like ring conformation changes and elimination of triflate, we were able to develop a strategy for the synthesis of the newly reported 2,3,4-triacetamido-2,3,4-trideoxy-l-arabinose
脂多糖(LPS)在体液免疫中起关键作用。最近,对LPS的结构嗜冷cryohalolentis K5 Ť菌株的报道。由于存在非天然氨基糖和支链,其结构是独特的。在此,我们报告了P的LPS类似物的总合成。cryohalolentis K5牛逼。克服像环的构象变化和消除三氟甲磺酸的问题之后,我们能够制定一项战略,在新报告的2,3,4- triacetamido -2,3,4-三脱氧合成升-阿拉伯糖衍生物。从非还原端到还原端,不同的供体与合适的受体偶联,并且进一步的官能团修饰递送了受保护的LPS六糖重复单元。官能团修饰后,我们无法氧化受阻伯羟基以合成目标分子。或者,除去永久性保护基团,得到了Psychobacter cryohalolentis K5 T的LPS六糖重复单元类似物。