Palladium-catalyzed 1,1-alkynylbromination of alkenes with alkynyl bromides
作者:Yusuke Ano、Natsuki Kawai、Naoto Chatani
DOI:10.1039/d1sc02873a
日期:——
The palladium-catalyzed 1,1-alkynylbromination of terminal alkenes with a silyl-protected alkynyl bromide is reported. The method tolerates a diverse range of alkenes including vinylarenes, acrylates, and even electronically unbiased alkene derivatives to afford propargylic bromides regioselectively. Mechanistic studies and DFT calculations indicate that the 1,1-alkynylbromination reaction proceeds
Palladium-Catalyzed Distal <i>m</i>-C–H Functionalization of Arylacetic Acid Derivatives
作者:Dasari Srinivas、Gedu Satyanarayana
DOI:10.1021/acs.orglett.1c02460
日期:2021.10.1
Herein, we present m-C–H olefination on derivatives of phenylaceticacids by tethering with a simple nitrile-based template through palladium catalysis. Notably, the versatility of the method is evaluated with a wide range of phenylaceticacid derivatives for obtaining the meta-olefination products in fair to excellent yields with outstanding selectivities under mild conditions. Significantly, the
A Facile Approach to Bis(isoxazoles), Promising Ligands of the AMPA Receptor
作者:Dmitry A. Vasilenko、Kirill S. Sadovnikov、Kseniya N. Sedenkova、Dmitry S. Karlov、Eugene V. Radchenko、Yuri K. Grishin、Victor B. Rybakov、Tamara S. Kuznetsova、Vladimir L. Zamoyski、Vladimir V. Grigoriev、Vladimir A. Palyulin、Elena B. Averina
DOI:10.3390/molecules26216411
日期:——
convenient synthetic approach to novel functionalized bis(isoxazoles), the promising bivalent ligands of the AMPA receptor, was elaborated. It was based on the heterocyclization reactions of readily available electrophilic alkenes with the tetranitromethane-triethylamine complex. The structural diversity of the synthesized compounds was demonstrated. In the electrophysiological experiments using the patch
详细阐述了一种新型功能化双(异恶唑)(AMPA 受体的有前途的二价配体)的便捷合成方法。它基于易于获得的亲电烯烃与四硝基甲烷-三乙胺络合物的杂环化反应。证明了合成化合物的结构多样性。在浦肯野神经元上使用膜片钳技术的电生理实验中,化合物 1,4-苯二(亚甲基)双(5-氨基异恶唑-3-羧酸盐)被证明是高效的 AMPA 受体正调节剂,增强红藻氨酸诱导的10 -11 M 时电流高达 70% 。
Rhodium(III)-Catalyzed Selective<i>ortho</i>-Olefinations of<i>N</i>-Acyl and<i>N</i>-Aroyl Sulfoximines by CH Bond Activation
作者:Kanniyappan Parthasarathy、Carsten Bolm
DOI:10.1002/chem.201304925
日期:2014.4.22
Two new rhodium‐catalyzed oxidative couplings between sulfoximine derivatives and alkenes by regioselectiveCH activation, affording ortho‐olefinated (Heck‐type) products, are reported. A synthetic application of the ortho‐alkenylated products into the corresponding cyclic derivatives has been demonstrated, and a mechanistic rational for the rhodium catalysis is presented.
Fluorescent multi-component polymer sensors for the sensitive and selective detection of Hg<sup>2+</sup>/Hg<sup>+</sup> ions <i>via</i> dual mode fluorescence and colorimetry
作者:Kaiqi Liu、Luminita Marin、Li Xiao、Xinjian Cheng
DOI:10.1039/d1nj04286f
日期:——
components (HD and PD) containing CC bonds. After binding to Hg2+/Hg+, MCP1 and MCP2 demonstrated fluorescence quenching and color changes, which allowed the dual-channel specific detection of Hg2+/Hg+. Compared with the probes containing HD, the probes containing PD showed higher sensitivity, and the good recognition ability caused the detection limit to be as low as 0.32 μM, which may be due to the “molecular
多组分聚合物(MCPs)将多种组分结合到主链或侧基中并具有特殊功能。在这项工作中,首先合成了具有酯基和/或烷氧基长链的小分子荧光硼二吡咯甲烯 (BODIPY)。然后,将这种小分子 BODIPY 与含有 C C 键的组分(HD 和 PD)通过Heck 偶联反应进行反应,得到具有不同功能的大分子探针。在酯基和烷氧基“尾部”的帮助下,聚合物MCP1和MCP2可溶于各种与水混溶的有机溶剂。此外,MCP3和MCP4完全溶于水。由于引入了含有 C C 键的成分(HD 和 PD),这些大分子探针显示出对 Hg 2+ /Hg + 的敏感和选择性识别。与 Hg 2+ /Hg +结合后,MCP1和MCP2表现出荧光猝灭和颜色变化,这使得双通道特异性检测 Hg 2+ /Hg +. 与含有HD的探针相比,含有PD的探针表现出更高的灵敏度,良好的识别能力使得检测限低至0.32 μM,这可能是由于“分子线”机制。具有