A series of non-peptide inhibitors targeting the polo-box domain (PBD) of polo-likekinase1 (Plk1) was designed based on the potent and selective minimal tripeptide Plk1 PBD inhibitor. Seven compounds were designed, synthesized and evaluated for fluorescence polarization (FP) assay. The most promising compound 10 bound to Plk1 PBD with IC50 of 3.37 μM and had no binding to Plk2 PBD or Plk3 PBD at
Cobalt-Porphyrin-Catalysed Intramolecular Ring-Closing C−H Amination of Aliphatic Azides: A Nitrene-Radical Approach to Saturated Heterocycles
作者:Petrus F. Kuijpers、Martijn J. Tiekink、Willem B. Breukelaar、Daniël L. J. Broere、Nicolaas P. van Leest、Jarl Ivar van der Vlugt、Joost N. H. Reek、Bas de Bruin
DOI:10.1002/chem.201700358
日期:2017.6.12
Cobalt porphyrin catalysed intramolecular ring-closing C-H bond amination enables direct synthesis of various N-heterocycles from aliphatic azides. Pyrrolidines, oxazolidines imidazolidines, isoindolines and tetrahydroisoquinoline can be obtained in good to excellent yields in a single reaction step with an air and moisture stable catalyst. Kinetic studies of the reaction in combination with DFT calculations
Highly efficient nitrobenzene and alkyl/aryl azide reduction in stainless steel jars without catalyst addition
作者:Katia Martina、Francesca Baricco、Silvia Tagliapietra、Maria Jesus Moran、Giancarlo Cravotto、Pedro Cintas
DOI:10.1039/c8nj04240c
日期:——
mechanochemical and selective reduction of aryl nitro and aryl/alkyl azide derivatives, with either formate salts or hydrazine, to the corresponding, synthetically useful amines occurs in excellent yields in a planetary ball mill without the addition of a catalyst. This newly developed and solvent-free protocol is efficient, fast and does not require the addition of a metal hydrogenation catalyst as the
A fast and efficient protocol for the synthesis of N,N'-disubstituted urea derivatives from alkyl halides and primary or secondary amines has been developed. The synthetic pathway combines nucleophilic substitutions and a Staudinger-aza-Wittig reaction in the presence of polymer-bound diphenylphosphine under 14 bar of CO2 pressure and has been performed in a one-pot two-step process. The protocol has
已开发出一种快速有效的方案,用于从烷基卤化物和伯胺或仲胺合成 N,N'-二取代脲衍生物。合成途径结合了亲核取代和 Staudinger-aza-Wittig 反应,在聚合物结合的二苯基膦存在下,在 14 bar 的 CO2 压力下,并在一个一锅两步法中进行。该协议在微波辐射下进行了优化,放大实验是在帕尔反应器的常规条件下进行的。最终化合物在简单过滤后以几乎定量的总产率分离,这使得该过程容易且快速执行。
Solvent-Free Copper-Catalyzed Azide-Alkyne Cycloaddition under Mechanochemical Activation
The ball-mill-based mechanochemical activation of metallic copper powder facilitates solvent-free alkyne-azide click reactions (CuAAC). All parameters that affect reaction rate (i.e., milling time, revolutions/min, size and milling ball number) have been optimized. This new, efficient, facile and eco-friendly procedure has been tested on a number of different substrates and in all cases afforded the corresponding 1,4-disubstituted 1,2,3-triazole derivatives in high yields and purities. The final compounds were isolated in almost quantitative overall yields after simple filtration, making this procedure facile and rapid. The optimized CuAAC protocol was efficiently applied even with bulky functionalized β-cyclodextrins (β-CD) and scaled-up to 10 g of isolated product.