Mild and efficient synthesis of indoles and isoquinolones<i>via</i>a nickel-catalyzed Larock-type heteroannulation reaction
作者:Wei-Zhi Weng、Jian Xie、Bo Zhang
DOI:10.1039/c8ob00795k
日期:——
A simple and efficient approach for the preparation of substituted indoles and isoquinolones via a nickel-catalyzed Larock-type heteroannulation reaction is reported. This transformation employed air-stable and inexpensive Ni(dppp)Cl2 as a precatalyst and Et3N as a mild base. Moreover, the reaction occurs efficiently under mild conditions, and a wide range of substituted indoles and isoquinolones bearing
<i>In Vivo</i> Photocontrol of Microtubule Dynamics and Integrity, Migration and Mitosis, by the Potent GFP-Imaging-Compatible Photoswitchable Reagents SBTubA4P and SBTub2M
作者:Li Gao、Joyce C. M. Meiring、Adam Varady、Iris E. Ruider、Constanze Heise、Maximilian Wranik、Cecilia D. Velasco、Jennifer A. Taylor、Beatrice Terni、Tobias Weinert、Jörg Standfuss、Clemens C. Cabernard、Artur Llobet、Michel O. Steinmetz、Andreas R. Bausch、Martin Distel、Julia Thorn-Seshold、Anna Akhmanova、Oliver Thorn-Seshold
DOI:10.1021/jacs.2c01020
日期:2022.3.30
stable, druglike colchicinoid microtubule inhibitors based on the styrylbenzothiazole (SBT) scaffold that are nonresponsive to typical fluorescent protein imaging wavelengths and so enable multichannel imaging studies. We applied these reagents both to 3D organoids and tissue explants and to classic model organisms (zebrafish, clawed frog) in one- and two-protein imaging experiments, in which spatiotemporally
光开关试剂是细胞生物学高精度研究的强大工具。当这些试剂在二维 (2D) 细胞培养物中全局施用但局部光激活时,它们可以发挥微米和毫秒级的生物控制作用。这使得它们在生物学上更相关的三维(3D)模型和体内具有巨大的应用潜力,特别是对于研究具有固有时空复杂性的系统,例如细胞骨架。然而,由于典型成像条件下的光开关异构化、代谢缺陷以及有效浓度下水溶性不足的综合作用,光开关试剂解决胞质蛋白靶标的体内潜力在很大程度上仍未实现。在这里,我们优化了基于苯乙烯基苯并噻唑 (SBT) 支架的代谢稳定、类药秋水仙素微管抑制剂的效力和溶解度,该支架对典型的荧光蛋白成像波长无响应,因此能够进行多通道成像研究。我们在一种和两种蛋白质成像实验中将这些试剂应用于 3D 类器官和组织外植体以及经典模型生物(斑马鱼、爪蛙),其中时空局部照明使它们能够光控制微管动力学、网络结构和微管。具有细胞精度和秒级分辨率的体内依赖过程。这些纳
Cobalt(<scp>ii</scp>)-catalyzed regioselective C–H halogenation of anilides
作者:Ze-lin Li、Kang-kang Sun、Chun Cai
DOI:10.1039/c8ob01448e
日期:——
A cobalt-catalyzed regioselective C–H halogenation methodology is reported herein. The highlight of this work is the highly selective C–H functionalization of anilides, which results in high-yielding, versatile, and practical halogenated products. Thereby, brominations, chlorinations and iodinations of many electron-rich and electron-deficient anilides were achieved in a highly selective fashion. Mechanistic
Synthesis of 2,3-Disubstituted Indoles and Benzofurans by the Tandem Reaction of Rhodium(II)-Catalyzed Intramolecular C–H Insertion and Oxygen-Mediated Oxidation
作者:Hongjuan Shen、Junkai Fu、Hao Yuan、Jianxian Gong、Zhen Yang
DOI:10.1021/acs.joc.6b00611
日期:2016.11.4
A highly effective and straightforward method to construct a wide range of functionalized 2,3-disubstituted indoles has been developed. The method involves the tandem reaction of rhodium(II)-catalyzed denitrogenative annulation of triazole-based benzyl anilines and oxygen-mediated oxidative aromatization. The developed method can also be used to synthesize 2,3-disubstituted benzofurans by replacing
catalyst‐controlled intramolecular allylic C−H insertion and cyclopropanation of donor/donor carbenes are reported. The RuII/Pybox complex selectively catalyzed the intramolecular allylic C−H insertion, providing vinyl‐substituted dihydroindoles with greater than 20:1 chemoselectivity and up to greater than 99 % ee. Chiraldirhodium(II) tetracarboxylates, however, selectively promoted the intramolecular cyclopropanation
据报道,供体/供体碳烯的化学,对映体和非对映体选择性催化剂控制的分子内烯丙基CH的高度插入和环丙烷化。Ru II / Pybox络合物选择性催化分子内烯丙基CH的插入,提供乙烯基取代的二氢吲哚,其化学选择性大于20:1,ee大于99%。但是,手性四羧酸二亚甲基二吡啶鎓盐(II)选择性地促进了分子内环丙烷化,从而以优异的收率产生了环丙烷稠合的四氢喹啉衍生物,其化学选择性大于99:1,ee高达97%。