基于无痕的半乳糖,核糖和阿拉伯糖系列的呋喃呋喃糖基叠氮化物的Staudinger连接与2-二苯基膦基苯基酯的高度立体选择性合成,已开发出α-或β-呋喃呋喃糖基酰胺。从普通的,容易获得的前体中,都可以以出色的选择性获得α-和β-异构体。该方法不取决于起始叠氮化物的异头构型,而是似乎受C2构型和底物的保护/脱保护状态控制。提供了对结果的机械解释,并通过31 P NMR实验得到了支持,并将其与我们之前对吡喃糖基叠氮化物连接反应的力学分析进行了合并。
A Generalized Procedure for the One-Pot Preparation of Glycosyl Azides and Thioglycosides Directly from Unprotected Reducing Sugars under Phase-Transfer Reaction Conditions
作者:Rishi Kumar、Pallavi Tiwari、Prakas R. Maulik、Anup K. Misra
DOI:10.1002/ejoc.200500646
日期:2006.1
Per-O-acetylated glycosylazides and thioglycosides were prepared in excellent yield directlyfromunprotectedreducingsugars through in situ generation of per-O-acetylated glycosyl bromides by a generalizedone-potprocedureunderphase-transferconditions. Stereoselective products were formed with complete inversion at the anomeric centers of the glycosyl bromides to provide a general high-yielding
Based on the structural scaffolds of natural products, two series of flavonoidderivatives, for a total of twelve compounds, were designed and synthesized as potential human telomerase inhibitors. Using a modified TRAP-PCR assay, compound 5c exhibited the most potent inhibitory activity against human telomerase with an IC50 value of less than 50 μM. In vitro, the results demonstrated that compound
Synthesis and Biological Evaluation of Novel Carbohydrate-Derived Derivatives of Erlotinib
作者:Wenbo Yu、Luxia Jiang、Chao Shen、Pengfei Zhang
DOI:10.1002/ddr.21328
日期:2016.9
Preclinical Research
临床前研究
Synthesis of biurets <i>via</i> TMSNCO addition to 1-aminosugars: application in the <i>de novo</i> synthesis of dC oxidation products
作者:Veronika Tsoulougian、Emmanuel E. Psykarakis、Thanasis Gimisis
DOI:10.1039/c8ob02810a
日期:——
and trimethylisocyanate (TMSNCO) was optimised as a one-step synthetic strategy for the synthesis of sugar biurets. This protocol was successfully applied to a number of 1-aminosugars, which exclusively provided the corresponding biurets in 67–99% yields. The new methodology was applied in the denovosynthesis of N1-(2-deoxy-α/β-D-erythro-pentofuranosyl)biuret (dfBU) and N1-(2-deoxy-α/β-D-erythro
1-氨基糖和三甲基异氰酸酯(TMSNCO)之间的反应被优化为一步合成糖缩二脲的合成策略。该方案已成功应用于多种1-氨基糖,它们以67-99%的产率专门提供了相应的缩二脲。新方法是在所施加的从头合成的Ñ 1 - (2-脱氧- α/β- d -赤-pentofuranosyl)缩二脲(dfBU)和Ñ 1 - (2-脱氧- α/β- d -赤-戊吡喃糖基)缩二脲(dpBU),两个已知的DNA损伤是由羟自由基引起的2'-脱氧胞苷(dCyd)分解引起的。
A highly efficient synthesis of N-glycosyl-1,2,3-triazoles using a recyclable cellulose-copper(0) catalyst in water
used as a highly active heterogeneous catalyst to synthesize N-glycosyl-1,2,3-triazoles from glycosyl azides and alkynes. Cellulose-Cu(0) catalysed the cycloaddition reaction to produce the corresponding products in good to excellent yields in water. This heterogeneous catalyst has the advantages of high catalytic reactivity and low copper leaching. The separation and reuse of the catalyst are easy