Synthesis of a series of ethylene glycol modified water-soluble tetrameric TPE-amphiphiles with pyridinium polar heads: Towards applications as light-up bioprobes in protein and DNA assay, and wash-free imaging of bacteria
Available online Development of water soluble AIE-active “light-up” bioprobes for the detection of biomacromolecules has drawn huge research interests in recent past. In this study, a series of ethylene glycol modified water soluble tetrameric tetraphenylethylene amphiphiles with pyridinium polar heads (TPE-xEG-Py, x = 3, 4, 6 or 1a-c) have been synthesized by varying the ethylene glycol spacer. Their
可以在线获取用于检测生物大分子的水溶性AIE活性“发光”生物探针的开发在最近几年引起了巨大的研究兴趣。在这项研究中,通过改变乙二醇间隔基,合成了一系列带有吡啶鎓极性头的乙二醇改性的水溶性四聚四苯基乙烯两亲物(TPE-xEG-Py,x = 3、4、6或1a-c)。它们独特的结构使它们能够在水溶液中形成囊泡和其他纳米聚集体。这些两亲物已成功用于基于静电相互作用的荧光检测和BSA和DNA的定量分析,从而触发了TPE部分的AIE发射。在革兰氏阴性菌(大肠杆菌)的免洗成像中,静电相互作用也被证明是非常有效的。)和革兰氏阳性(金黄色葡萄球菌)细菌,在细菌浓度为0–12×10 8 CFU mL -1的情况下,荧光响应增加多达92倍。由于具有成本效益且易于合成,高水溶性和快速响应,该策略是有利的。
SUBSTITUTED BENZAMIDES AND THEIR USES
申请人:The Board of Trustees of the Leland Stanford Junior University
公开号:US20150329503A1
公开(公告)日:2015-11-19
Provided herein are Substituted Benzamides, compositions, and method of their manufacture and use.
Efficient synthesis of diverse heterobifunctionalized clickable oligo(ethylene glycol) linkers: potential applications in bioconjugation and targeted drug delivery
作者:Lalit N. Goswami、Zachary H. Houston、Saurav J. Sarma、Satish S. Jalisatgi、M. Frederick Hawthorne
DOI:10.1039/c2ob26968f
日期:——
Herein we describe the sequential synthesis of a variety of azide-alkyne click chemistry-compatible heterobifunctional oligo(ethylene glycol) (OEG) linkers for bioconjugation chemistry applications. Synthesis of these bioorthogonal linkers was accomplished through desymmetrization of OEGs by conversion of one of the hydroxyl groups to either an alkyne or azido functionality. The remaining distal hydroxyl group on the OEGs was activated by either a 4-nitrophenyl carbonate or a mesylate (–OMs) group. The –OMs functional group served as a useful precursor to form a variety of heterobifunctionalized OEG linkers containing different highly reactive end groups, e.g., iodo, –NH2, –SH and maleimido, that were orthogonal to the alkyne or azido functional group. Also, the alkyne- and azide-terminated OEGs are useful for generating larger discrete poly(ethylene glycol) (PEG) linkers (e.g., PEG16 and PEG24) by employing a Cu(I)-catalyzed 1,3-dipolar cycloaddition click reaction. The utility of these clickable heterobifunctional OEGs in bioconjugation chemistry was demonstrated by attachment of the integrin (αvβ3) receptor targeting peptide, cyclo-(Arg-Gly-Asp-D-Phe-Lys) (cRGfKD) and to the fluorescent probe sulfo-rhodamine B. The synthetic methodology presented herein is suitable for the large scale production of several novel heterobifunctionalized OEGs from readily available and inexpensive starting materials.
Organocatalysis of nucleophilic substitution reactions by the combined effects of two promoters fused in a molecule: oligoethylene glycol substituted imidazolium salts
作者:Vinod H. Jadhav、Ju-Young Kim、Dae Yoon Chi、Sungyul Lee、Dong Wook Kim
DOI:10.1016/j.tet.2013.10.070
日期:2014.1
Oligoethylene glycol substituted imidazolium salts were synthesized as promoters for a range of SN2 reactions, and their efficiency was examined. These tailor-made organic promoters enhanced the nucleophilicity of alkali metal salts significantly through the combined effects of two promoters (oligoethylene glycols and imidazolium salts) in a single molecule. The effects of the oligoethylene glycol
合成了低聚乙二醇取代的咪唑鎓盐作为一系列S N 2反应的促进剂,并检查了它们的效率。这些量身定制的有机促进剂通过两个促进剂(低聚乙二醇和咪唑鎓盐)在单个分子中的联合作用,显着增强了碱金属盐的亲核性。系统研究了低聚乙二醇侧链长度,离子液体阴离子,亲核试剂和底物的影响。[hexaEGmim] [OMs]和[dihexaEGim] [OMs]显示了使用碱金属盐进行S N 2反应的最高效率。通过检查相对S N来评估低聚乙二醇部分的末端羟基基团的作用2氯化和溴化收率。结果表明,羟基与亲核试剂的氢键强度非常重要。通过量子化学计算研究了oligoEGILs促进S N 2反应的优异机理。结果表明,低聚乙二醇部分中的氧原子和离子液体阴离子作为路易斯碱作用于抗衡阳离子K +或Na +上,从而显着提高了金属盐的反应性。