Convenient Entry to <sup>18</sup>
F-Labeled Amines through the Staudinger Reduction
作者:E. Johanna L. Stéen、Vladimir Shalgunov、Christoph Denk、Hannes Mikula、Andreas Kjaer、Jesper L. Kristensen、Matthias M. Herth
DOI:10.1002/ejoc.201801457
日期:2019.2.28
amino‐functionalized synthons is a convenient and versatile approach to synthesize a broad variety of PET tracers. Herein, we report a method to convert 18F‐labeled azides to primary amines by means of the Staudingerreduction. Aliphatic and aromatic 18F‐labeled azides were converted into the corresponding amines with high conversion yields. The method was easily automated. From a broader perspective, the applied
Fluorine-18 在正电子发射断层扫描 (PET) 成像中具有出色的衰变特性。因此,它非常适合临床应用。因此,改进将氟-18纳入生物活性分子的策略至关重要。使用氨基功能化合成子进行间接 18F 标记是合成各种 PET 示踪剂的一种方便且通用的方法。在此,我们报告了一种通过施陶丁格还原将 18F 标记的叠氮化物转化为伯胺的方法。脂肪族和芳香族18F标记的叠氮化物被转化为相应的胺,转化率很高。该方法很容易实现自动化。从更广泛的角度来看,所应用的策略从单个前体产生两个有用的合成子,从而增加了以最少的合成工作标记不同化学支架的灵活性。
Two-Color Glycan Labeling of Live Cells by a Combination of Diels-Alder and Click Chemistry
is not enough: Terminal alkenes are used as chemical reporters and ligation partners for 1,2,4,5‐tetrazines in a Diels–Alder reaction with inverse electron demand (DARinv). Combination with strain‐promoted azide–alkyne cycloaddition (SPAAC) allows the visualization of two different glycan structures in one experiment.
Rapid Labeling of Metabolically Engineered Cell-Surface Glycoconjugates with a Carbamate-Linked Cyclopropene Reporter
作者:Anne-Katrin Späte、Holger Bußkamp、Andrea Niederwieser、Verena F. Schart、Andreas Marx、Valentin Wittmann
DOI:10.1021/bc4004487
日期:2014.1.15
Metabolic oligosaccharide engineering is a valuable tool to monitor cellular carbohydrates. Here, we report the synthesis of a novel N-acyl-mannosamine derivative bearing a methylcyclopropene tag that is attached to the sugar via a carbamate moiety. This derivative undergoes rapid Diels–Alderreaction with inverseelectrondemand. We demonstrate that the cell’s biosynthetic machinery incorporates this
Post-synthesis DNA modifications using a trans-cyclooctene click handle
作者:Ke Wang、Danzhu Wang、Kaili Ji、Weixuan Chen、Yueqin Zheng、Chaofeng Dai、Binghe Wang
DOI:10.1039/c4ob02031f
日期:——
Post-synthesis DNA modification is a very useful method for DNA functionalization. This is achieved by using a modified NTP, which has a handle for further modifications, replacing the corresponding natural NTP in polymerase-catalyzed DNAsynthesis. Subsequently, the handle can be used for further functionalization after PCR, preferably through a very fast reaction. Herein we describe polymerase-mediated
合成后 DNA 修饰是 DNA 功能化的一种非常有用的方法。这是通过使用修饰的 NTP 来实现的,该修饰的 NTP 可以进行进一步修饰,在聚合酶催化的 DNA 合成中取代相应的天然 NTP。随后,手柄可用于 PCR 后的进一步功能化,优选通过非常快的反应。在此,我们描述了聚合酶介导的反式环辛烯修饰的胸苷三磷酸(TCO-TTP)的掺入。随后,反式环辛烯基团通过非常快的点击反应与连接到其他官能团的四嗪反应。通过硼酸基团和荧光团的掺入证明了这种 DNA 功能化方法的实用性。同样的方法也成功地用于修饰用于荧光标记应用的已知适体。
Preparation of Carbohydrate Arrays by Using Diels-Alder Reactions with Inverse Electron Demand
作者:Henning S. G. Beckmann、Andrea Niederwieser、Manfred Wiessler、Valentin Wittmann
DOI:10.1002/chem.201200382
日期:2012.5.21
surface. We examined the Diels–Alderreaction with inverse‐electron‐demand (DARinv) as an irreversible, chemoselective ligation reaction for that purpose. After having shown the efficiency of the DARinv in solution, we prepared a series of carbohydrate–dienophile conjugates that were printed onto tetrazine‐modified glass slides. Binding experiments with fluorescently labeled lectins proved successful