本文介绍了一系列硝酰基-硝基氧(NN),氧杂二氮基(OVZ)的合成基团,该基团与4-苯基-2,6-双吡唑基吡啶偶联单元相连,具有光学,电子自旋共振(ESR) )的光谱学研究和计算分析。ESR研究表明,NN双自由基(| D / hc | = 0.00719 cm -1)的轴向零场分裂(zfs)参数大于OVZ双自由基(| D / hc | = 0.00601 cm -1)。此外,两个双自由基均显示出禁止的半场跃迁(ΔM s =±2; g av〜4.01)在170 K时证明了它们的三重态。对两个双自由基的低温ESR测量显示,居里磁行为的ΔM s =±2信号强度(χEPR)降至4.2K。自旋-自旋交换耦合(Ĵ二者NN和OVZ基于双自由基的)表明,两种双自由基的基态自旋多重可能是三重峰(小号= 1)或它几乎与简并的单线态-三线态Ĵ NN » Ĵ OVZ。
construction of boron-based macrocycles and dendrimers is described. Condensation of aryl- and alkylboronic acids with 3,4-dihydroxypyridine is shown to give pentameric macrocycles in which five boronate esters are connected by dative B−N bonds. Three macrocycles have been characterized crystallographically. The boron atoms of these assemblies represent chiral centers, and the assembly process is highly diastereoselective
Tailoring a Bacteriochlorin Building Block with Cationic, Amphipathic, or Lipophilic Substituents
作者:Christian Ruzié、Michael Krayer、Thiagarajan Balasubramanian、Jonathan S. Lindsey
DOI:10.1021/jo800736c
日期:2008.8.1
malleable molecules. To overcome these limitations, a synthetic free base 3,13-dibromobacteriochlorin (BC-Br3Br13) has been exploited as a building block in the synthesis of diverse bacteriochlorins via Pd-mediatedcoupling reactions (Sonogashira, Suzuki, and reductive carbonylation). Each bacteriochlorin is stable to adventitious dehydrogenation by virtue of the presence of a geminal dimethyl group in
Compounds and Methods for Inhibiting the Interaction of BCL Proteins with Binding Partners
申请人:CASTRO C. Alfredo
公开号:US20080114167A1
公开(公告)日:2008-05-15
The invention relates to isoxazolidine containing compounds that bind to bcl proteins and inhibit Bcl function. The compounds may be used for treating and modulating disorders associated with hyperproliferation, such as cancer.
Borophosphonate Cages: Easily Accessible and Constitutionally Dynamic Heterocubane Scaffolds
作者:Justus Tönnemann、Rosario Scopelliti、Konstantin O. Zhurov、Laure Menin、Stefanie Dehnen、Kay Severin
DOI:10.1002/chem.201201287
日期:2012.8.6
experimentally facile procedure for the synthesis of borophosphonate cages of the general formula [tBuPO3BR′]4 is described. The method involves heating of tert‐butylphosphonic acid with a boronic acid in toluene to give borophosphonates in [4+4] condensation reactions. The products display a heterocubane structure with bent P‐O‐B bridges as evidenced by crystallographic analyses. Scrambling experiments show
描述了用于合成通式[ t BuPO 3 BR'] 4的硼膦酸酯笼的通用且实验上容易的程序。该方法涉及加热叔叔叔丁基膦酸与硼酸的甲苯溶液在[4 + 4]缩合反应中生成硼膦酸酯。产品显示出具有弯曲的P-O-B桥的异源结构,如晶体学分析所证明的那样。扰乱实验表明,硼膦酸盐笼是结构上动态的支架,在室温下,每小时发生一次交换反应。笼子可以装饰有反应性基团,例如醛。我们的结果表明,硼膦酸酯笼是动态共价化学的有趣构建基块。
Carboxylated Photoswitchable Diarylethenes for Biolabeling and Super-Resolution RESOLFT Microscopy
作者:Benoît Roubinet、Mariano L. Bossi、Philipp Alt、Marcel Leutenegger、Heydar Shojaei、Sebastian Schnorrenberg、Shamil Nizamov、Masahiro Irie、Vladimir N. Belov、Stefan W. Hell
DOI:10.1002/anie.201607940
日期:2016.12.5
pulses of UV and blue light induce numerous reversible photochemical transformations between two stables states with distinct structures. Using relatively low light intensities, EBTs were applied in biology‐related super‐resolution microscopy based on the reversible saturable (switchable) optical linear fluorescence transitions (RESOLFT) and demonstrated optical resolution of 75 nm.