Stereospecific Iron-Catalyzed Carbon (sp<sup>2</sup>)–Carbon (sp<sup>2</sup>) Cross-Coupling of Aryllithium with Vinyl Halides
作者:Peng Chen、Zhi-Yong Wang、Xiao-Shui Peng、Henry N.C. Wong
DOI:10.1021/acs.orglett.1c01318
日期:2021.6.4
We present herein an efficient synthetic protocol involving iron-catalyzed cross-coupling of organolithium compounds with vinyl halides as key coupling partners. More than 30 examples were obtained with moderate to good yields and high stereoselectivities. The practicality of this method is evidenced by a gram-scale synthesis. In addition, a preliminary mechanistic investigation was also performed
Synthesis of fused heterocyclic systems via the Mallory photoreaction of arylthienylethenes
作者:Natalia V. Dyachenko、Andrey V. Khoroshutin、Yulia A. Sotnikova、Valentina A. Karnoukhova、Sergey D. Tokarev、Alexander V. Anisimov、Yurii V. Fedorov、Olga A. Fedorova
DOI:10.1039/c9pp00289h
日期:2019.12
Photochemical oxidative cyclization of 2- and 3-thienylstilbenes (heterostilbenes) containing mono-, di- and trimethoxy groups in the benzene ring or heterocyclic fragment results in the formation of isomeric thieno-annelated polycyclic aromatic compounds demonstrating optical properties that differ from those of initial stilbene derivatives. The structures of cyclic products were evaluated via1H and
苯环或杂环片段中含有单,二和三甲氧基的2-和3-噻吩基苯乙烯(杂苯)的光化学氧化环化导致形成异噻吩基退火的多环芳族化合物,这表明其光学性质不同于最初的光学性质二苯乙烯衍生物。通过1 H和13 C NMR,HRMS,元素分析和X射线晶体学对环状产物的结构进行了评估。该研究旨在研究噻吩的二苯乙烯衍生物中的取代基以及噻吩核中苯乙烯基片段的位置对光环化反应发生的影响。
ALPHA-SYNUCLEIN LIGANDS
申请人:Washington University
公开号:US20170189566A1
公开(公告)日:2017-07-06
The present invention generally relates to various compounds that are useful as α-synuclein ligands. The invention further relates to methods of using these compounds and their radiolabeled analogs for the detection of synucleinopathies, including Parkinson's disease (PD).
Water mediated Heck and Ullmann couplings by supported palladium nanoparticles: importance of surface polarity of the carbon spheres
作者:Ahmed Kamal、Vunnam Srinivasulu、B. N. Seshadri、Nagula Markandeya、A. Alarifi、Nagula Shankaraiah
DOI:10.1039/c2gc16430b
日期:——
Heterogeneous palladiumnanoparticle catalysts that are supported on amphiphilic carbon spheres (Pd@CSP) have been utilized for water-mediated Heck coupling reactions of aryl halides with different alkenes under phosphine free as well as aerobic conditions. Furthermore, a variety of Heck coupling reactions using different bases and solvents, including organic polar and non-polar solvents, have been
Determining the excited-state substituent constants of furyl and thienyl groups
作者:Junyan Qu、Chao-Tun Cao、Chenzhong Cao
DOI:10.1002/poc.3799
日期:2018.5
and their wavelength of absorption maximum λmax was recorded. For the wavenumber νmax (cm−1, νmax = 1/λmax) of the obtained λmax, a quantitative correlation analysis was performed, and 6 excited‐statesubstituent constants of groups X were obtained by means of curve‐fitting method. Taking the νmax values of total 90 compounds of styrene derivatives as a data set (including 25 compounds from reference