Conversion of Aryl Azides to O-Alkyl Imidates via Modified Staudinger Ligation
摘要:
o-Carboalkoxy triarylphosphines are shown to react with aryl azides to provide Staudinger ligation products bearing O-alkyl imidate linkages. This is in contrast to alkyl azides whose ligation to o-carboalkoxy triarylphosphines has been reported to yield amide-linked materials. This extension of the Staudinger ligation for coupling of abiotic reagents under biocompatible conditions highlights the utility of commercially available triarylphosphines through which suitable linkers can be attached via an ester moiety.
Conversion of Aryl Azides to O-Alkyl Imidates via Modified Staudinger Ligation
摘要:
o-Carboalkoxy triarylphosphines are shown to react with aryl azides to provide Staudinger ligation products bearing O-alkyl imidate linkages. This is in contrast to alkyl azides whose ligation to o-carboalkoxy triarylphosphines has been reported to yield amide-linked materials. This extension of the Staudinger ligation for coupling of abiotic reagents under biocompatible conditions highlights the utility of commercially available triarylphosphines through which suitable linkers can be attached via an ester moiety.
demonstrate here that MTase-modified DNA can undergo the Staudinger ligation with triarylphosphines derivatized with phenanthroline. Presentation of these duplexes with Cu(II) and 3-mercaptopropionic acid leads to strand scission proximal to the MTase recognition site. By virtue of their ability to use a synthetic azide-bearing cofactor, M.TaqI and M.HhaI produce a DNA lesion that induces scission 5' to
我们在此证明 MTase 修饰的 DNA 可以与用菲咯啉衍生的三芳基膦进行 Staudinger 连接。这些双链体与 Cu(II) 和 3-巯基丙酸的呈递导致靠近 MTase 识别位点的链断裂。M.TaqI 和 M.HhaI 凭借其使用合成的含叠氮化物辅因子的能力,产生 DNA 损伤,诱导酶修饰碱基的 5' 端断裂。这种化学方法代表了一种新方法,通过该方法可以根据 DNA 损伤快速识别 DNA 甲基化区域。
Targeted Imaging and/or Therapy Using the Staudinger Ligation
申请人:Robillard Marc Stefan
公开号:US20080181847A1
公开(公告)日:2008-07-31
The use of a selective chemical and bioorthogonal reaction providing a covalent ligation such as the Staudinger ligation, in targeted molecular imaging and therapy is presented, more specifically with interesting applications for pre-targeted imaging or therapy. Current pre-targeted imaging is hampered by the fact that it relies solely on natural/biological targeting constructs (i.e. biotin/streptavidin). Size considerations and limitations associated with their endogenous nature severely limit the number of applications. The present invention describes how the use of an abiotic, bio-orthogonal reaction which forms a stable adduct under physiological conditions, by way of a small or undetectable bond, can overcome these limitations.
COMPOSITIONS AND METHODS FOR BROAD-SPECTRUM ANTIVIRAL THERAPY
申请人:AVALON FLAVIVIRAL THERAPEUTICS (HK) LIMITED
公开号:US20200338032A1
公开(公告)日:2020-10-29
AM580 and structurally related compounds have been found to be useful in treating infection by a wide range of RNA and DNA viruses, and also in reducing associated inflammation. This activity is independent of RAR-α signaling, and is not a result of activation of the hosts innate immune response. Broad antiviral activity of AM580 and structurally related compounds is a due to modulation of lipogenesis so as to correct disregulation of this pathway in virus-infected cells, via inhibition of nSREPBP