A New Class of Branched Aminoglycosides: Pseudo-Pentasaccharide Derivatives of Neomycin B
摘要:
The clinically important antibiotic neomycin B was modified at position C5" by adding one extra sugar ring in the beta-configuration, and the observed pseudo-pentasaccharides were tested against various bacterial strains, including pathogenic and resistant strains. The designed antibiotics show antibacterial activity superior to that of neomycin B against pathogenic and resistant bacterial strains.
unique capsular polysaccharide (CPS) with anti-freeze properties similar to those of the well-known anti-freeze (glyco)proteins. The tetrasacchariderepeatingunit of the CPS – constituted of alternating amino sugars and uronic acid moieties in a glycosaminoglycan-like fashion with an amide-linked threonine (Thr) decoration – was synthesized as an O-n-propyl glycoside. The synthesis faced some challenging
Colwellia psychrerythraea 34H是一种嗜冷革兰氏阴性细菌,能够通过产生独特的荚膜多糖(CPS)而在零下温度下存活,该荚膜多糖具有与众所周知的抗冻(glyco)蛋白相似的抗冻特性。合成了CPS的四糖重复单元,它是由交替的氨基糖和糖醛酸部分组成,呈类似糖胺聚糖的形式,带有酰胺连接的苏氨酸(Thr)装饰物,被合成为O-正丙基糖苷。合成面临一些挑战性的特征,例如建立拥挤的[→2)α- D -Gal p(1→]部分以及两个尿嘧啶单元仅用于在其中一个区域选择性插入Thr酰胺,得到的四糖的NMR数据证实了拟南芥(C. psychrerythraeaea)多糖的结构。
Substituted tetrahydropyrane derivatives, method for producing same, their use as medicine or diagnostic agent, as well as medicine containing same
申请人:Aventis Pharma Deutschland GmbH
公开号:US06756489B1
公开(公告)日:2004-06-29
Substituted tetrahydropyran derivatives, processes for their preparation, their use as a pharmaceutical or diagnostic, and pharmaceutical comprising them. The invention relates to compounds of the formula I
in which the radicals R1, R2, R3, R4, R5 and X have the meaning mentioned in the description, a process for the preparation of the compounds of the formula I on a solid phase, and their use as pharmaceuticals.
First Total Synthesis of the Bioactive Arylnaphthyl Lignan 4-<i>O</i>
-Glycosides Phyllanthusmin D and 4′′-<i>O</i>
-Acetylmananthoside B
作者:Lei Liu、Yang Hu、Hui Liu、De-Yong Liu、Jian-Hui Xia、Jian-Song Sun
DOI:10.1002/ejoc.201700556
日期:2017.7.7
Based on the orchestrated application of PTC and Yu glycosylations, the first total synthesis of arylnaphthalide glycosides, phyllanthusmin D and 4''-O-acetylmananthoside B, which were claimed to be ideal antitumoral lead compounds in terms of cytotoxicity, cytotoxic selectivity, and novel working mechanism, were achieved. With easily accessible compounds as starting materials, the two target molecules
Chemical Synthesis of the Nonreducing Hexasaccharide Fragment of Axinelloside A Based on a Stepwise Glycosylation Approach
作者:Su-Jia Li、Qing Fang、Ying-Wen Huang、Yi-Yang Luo、Xiao-Dong Mu、Ling Li、Xiao-Chen Yin、Jin-Song Yang
DOI:10.1021/acs.orglett.2c02618
日期:2022.10.7
An expedient synthesis of the nonreducing hexasaccharide fragment of axinelloside A has been completed via a linear stepwise glycosylation approach. Challenges involved in the synthesis include the highly stereoselective construction of five consecutive 1,2-cis-glycosidic linkages and the formation of a sterically crowded 2,3-disubstituted l-fucoside subunit. Protecting group-directing glycosylation