A simple and efficient synthetic method for the preparation of alkyl H-phosphonate monoesters has been developed. The method consists of transesterification of commercially available diphenyl H-phosphonate with an appropriate alcohol under mild conditions, followed by ammonolysis of the in situ formed dialkyl and alkyl phenyl H-phosphonates.
Synthesis of methylphosphorylated oligomannosides structurally related to lipopolysaccharide O-antigens of <i>Klebsiella pneumoniae</i> serotype O3 and their application for detection of specific antibodies in rabbit and human sera
作者:Arsenii S. Solovev、Evgeniya M. Denisova、Ekaterina A. Kurbatova、Olga Y. Kutsevalova、Liubov G. Boronina、Vladimir A. Ageevets、Sergey V. Sidorenko、Vadim B. Krylov、Nikolay E. Nifantiev
DOI:10.1039/d3ob01203d
日期:——
mono-, di- and trimannosides structurally related to the lipopolysaccharide (LPS) O-antigens of Klebsiellapneumoniae of serotype O3 were synthesized and conjugated with a biotin tag. The stereo- and regioselective assembly of target carbohydrate chains was conducted using uniform monosaccharide synthetic blocks. After that, a methylphosphate group was introduced by coupling with a methyl-H-phosphonate
合成了与 O3 血清型肺炎克雷伯菌的脂多糖 (LPS) O 抗原结构相关的甲基磷酸化单甘露糖苷、二甘露糖苷和三甘露糖苷,并与生物素标签缀合。使用均匀的单糖合成嵌段进行目标碳水化合物链的立体和区域选择性组装。之后,通过与甲基-H-膦酸酯试剂偶联引入甲基磷酸基团,然后氧化和脱保护,得到目标寡糖。所得化合物的1 H 和13 C NMR谱与相应天然多糖的谱图吻合良好。新制备的生物素化寡糖以及先前报道的与肺炎克雷伯菌LPS的半乳聚糖I和半乳聚糖II相关的生物素化糖缀合物用于ELISA检测抗肺炎克雷伯菌兔血清中的抗体。抗O3血清抗体特异性识别具有末端甲基磷酸甘露糖基残基的合成寡糖配体,而抗O1血清抗体识别与肺炎克雷伯菌半乳聚糖II相关的寡糖。对确诊克雷伯氏菌感染患者的人体血清分析也表明,临床病例中存在针对合成寡糖的抗体。因此,所描述的化合物与其他克雷伯氏菌相关的抗原寡糖一起可以潜在地用作肺炎克雷伯氏菌
Synthesis of Carbohydrate Methyl Phosphoramidates
作者:Roger A. Ashmus、Todd L. Lowary
DOI:10.1021/ol500894k
日期:2014.5.2
A two-step route for introducing methyl phosphoramidate moieties onto carbohydrates is reported. The approach uses methyl pivolyl H-phosphonate as the phosphorylating reagent to produce an isolable carbohydrate H-phosphonate intermediate that is then oxidized by a Todd-Atherton reaction. The stability of the product methyl phosphoramidates was subsequently evaluated using various deprotection strategies.
Hammond,P.R., Journal of the Chemical Society, 1962, p. 2521 - 2522