Self-sacrificing acetylation observed during attempted desilylation of 1-[4-benzenesulfonyl-3-O-(tert-butyldimethylsilyl)-2-deoxy-5-O-methanesulfonyl-α-l-threo-pentofuranosyl]thymine
作者:Hisashi Shimada、Yutaka Kubota、Hiromichi Tanaka
DOI:10.1016/j.tetlet.2010.06.039
日期:2010.8
Desilylation of 1-[4-benzenesulfonyl-3-O-(tert-butyldimethylsilyl)-2-deoxy-5-O-methanesulfonyl-α-l-threo-pentofuranosyl]thymine (4) with Bu4NF/THF, when carried out at room temperature, gave four products. Among these, there were 1-[3-O-acetyl-4-benzenesulfonyl-2-deoxy-5-O-methanesulfonyl-α-l-threo-pentofuranosyl]thymine (7) and thymine. A possible reaction mechanism is proposed, which suggests the
Identification of the Oxidized Products Formed upon Reaction of Chromium(V) with Thymidine Nucleotides
作者:Kent D. Sugden、Karen E. Wetterhahn
DOI:10.1021/ja962428x
日期:1996.1.1
Two pathways have been observed for Cr(V)-mediated nucleotide oxidation in reactions of bis(2-ethyl-2-hydroxybutyrato)oxochromate(V) [CrO(ehba)2]- with thymidine nucleotides dTMP, dTDP, and dTTP. The extent of Cr(V)-induced nucleotide oxidation was greatest for thymidine diphosphate (dTDP), as measured by the production of thiobarbituric acid reactive species (TBARS; indicative of pathway 1) and thymine
Phosphorus containing materials, their preparation and use
申请人:——
公开号:US20040026671A1
公开(公告)日:2004-02-12
There is described a co-polymerisable phosphorus containing polymer precursor which comprises: a) a polymerisable unsaturated bond; b) a oxycarbonyl or iminocarbony group; and c) a free hydroxy group or a functional group obtainable by reaction of a free hydroxy group with a suitable electrophile; and d) a terminal phosphorus and oxygen containing group located at the end of a carbon chain and comprising at least one group selected from: hydroxy phosphorus and an optionally substituted hydrocarbyl group attached to a phosphorus atom through an oxy group; where the polymer precursor: is substantially free of halo comprising species; has a molecular weight (Mn if a polymer) of from about 200 to about 5,000 daltons; and optionally, has a Hoppler viscosity measured at 25° C. of less than about 14,000 mPa.s. These polymer precursors are obtainable as the product of a reaction between an optionally substituted terminal phosphate or H-phosphonate ester and compound comprising at least one oxiranyl, preferably epoxy, ring adjacent an alkylidenylcarbonyloxy group. The polymer precursors can be copolymerised with other monomers to produce copolymers such as phosphorus containing polyurethanes which for example have use as flame retardants, anti-corrosives, pigment dispersants and/or adhesion promoters.
This invention discloses synergistic blends of phosphates and lactones having a base structure of 3-phenylbenzofuran-2-one with or without other additives as stabilizers for polymers, particularly during melt processing as evidenced by changes in melt flow and in some instances, resistance to yellowing.
Liver cell clones for artifical liver and extracorporeal liver assist device
申请人:JMS Co., Ltd.
公开号:EP1063289A1
公开(公告)日:2000-12-27
Disclosed is a blood perfusion device or apparatus that is used for bioartificial liver support. Human hepatocyte lines established from normal regenerating liver tissue and modulated in toxin-challenging conditions are provided. These functional hepatocytes exhibit extraordinarily enhanced detoxification functions, which are characterised by the elevated glutathione content and glutathione S-transferase activity. A bioreactor is constructed with the functional hepatocytes for bioartificial liver support system, which includes perfusion inlets and perfusion outlets, a containment vessel, a centrifugal pump and macroporous microcarriers where the functional hepatocytes are grown.
所公开的是一种用于生物人工肝支持的血液灌流装置或设备。提供了从正常再生肝组织中建立并在毒素挑战条件下调节的人类肝细胞系。这些功能性肝细胞的解毒功能异常增强,其特点是谷胱甘肽含量和谷胱甘肽 S 转移酶活性升高。该系统包括灌注入口和灌注出口、密闭容器、离心泵和生长功能肝细胞的大孔微载体。