A convenient [hydroxy(tosyloxy)iodo]benzene-mediated one-pot synthesis of 2-arylimidazo[2,1-b]benzothiazoles
摘要:
Several 2-arylimidazo[2,1-b]benzothiazoles (4) have been conveniently synthesized in one-pot reactions via alpha-tosyloxylation of enolizable ketones (1) using [hydroxy(tosyloxy)iodo]benzene 2 in acetonitrile, followed by treatment with 2-amino-6-(substituted)benzothiazoles (3). The present protocol offers several advantages towards general access of 2-arylimidazo[2,1-b]benzothiazoles, including an intriguing alternative to the literature protocols, a readily available nontoxic reagent, operational simplicity and an environmentally benign procedure.
amidating reagent has been developed. This protocol is a simple, straightforward, and economic was to afford a variety of N-(2-(imidazo[1,2-a]pyridin-2-yl)phenyl)acetamide derivatives with excellent yields. A mechanistic study reveals that a reversible cleavage of C–H bond might be involved in the reaction.
已经开发了使用二恶唑酮作为酰胺化试剂的Rh(III)催化的2-芳基咪唑杂环的定向邻位酰胺化。该方案简单,直接且经济,目的是以优异的产率提供各种N-(2-(咪唑并[1,2 - a ]吡啶-2-基)苯基)乙酰胺衍生物。一项机理研究表明,该反应可能涉及C–H键的可逆裂解。
Exogenous-oxidant-free electrochemical oxidative C–H phosphonylation with hydrogen evolution
作者:Yong Yuan、Jin Qiao、Yangmin Cao、Jingmei Tang、Mengqin Wang、Guojuan Ke、Yichen Lu、Xue Liu、Aiwen Lei
DOI:10.1039/c9cc00975b
日期:——
We herein report a versatile and environmentally friendly electrochemical oxidative C–H phosphonylation protocol.
我们在此报告一种通用且环境友好的电化学氧化C-H磷酰化协议。
Electrochemical sulfonylation of imidazoheterocycles under batch and continuous flow conditions
protocol for the C–H sulfonylation of imidazoheterocycles via electrochemical activation was established under batch and flow conditions. The selective C–Hbondfunctionalization proceeded under catalyst- and oxidant-free conditions and tolerated a wide range of functional groups. Various sodium sulfinates as well as imidazo[1,2-a]-pyridines, -pyrimidine, -quinolines, and -isoquinolines, imidazo[1,2-b]pyridazine
在分批和流动条件下,建立了一种通过电化学活化对咪唑杂环进行 C-H 磺酰化的有效且通用的方案。选择性 C-H 键官能化在无催化剂和无氧化剂条件下进行,并耐受多种官能团。各种亚磺酸钠以及咪唑并[1,2- a ]-吡啶、-嘧啶、-喹啉和-异喹啉、咪唑并[1,2- b ]哒嗪、咪唑[2,1- b ]噻唑和苯并[ d ]咪唑并[1,2- b ]噻唑反应成功。有趣的是,在微流体条件下获得了显着的加速和更高的产量。
3-Substituted 2-Phenylimidazo[2,1-b]benzothiazoles: Synthesis, Anticancer Activity, and Inhibition of Tubulin Polymerization
作者:Ahmed Kamal、Farheen Sultana、M. Janaki Ramaiah、Y. V. V. Srikanth、A. Viswanath、Chandan Kishor、Pranjal Sharma、S. N. C. V. L. Pushpavalli、Anthony Addlagatta、Manika Pal-Bhadra
DOI:10.1002/cmdc.201100511
日期:2012.2.6
2‐phenylimidazo[2,1‐b]benzothiazoles (3 a–h) were synthesized by C‐arylation of 2‐arylimidazo[2,1‐b]benzothiazoles using palladium acetate as catalyst, and the resulting compounds were evaluated for their anticanceractivity. Compounds 3 a, 3 e, and 3 h exhibited good antiproliferative activity, with GI50 values in the range of 0.19–83.1 μM. Compound 3 h showed potent anticancer efficacy against 60 human
以乙酸钯为催化剂,通过2-芳基咪唑并[2,1– b ]苯并噻唑的C-芳基化反应合成了一系列新的3-取代的2-苯基咪唑并[2,1– b ]苯并噻唑(3 a – h)。评价所得化合物的抗癌活性。化合物3,图3e,和3小时显示出良好的抗增殖活性,与GI 50个中的0.19-83.1μ范围内的值中号。化合物3小时显示出对60个人癌症细胞系有效的抗癌功效,平均GI 50 μ的0.88值中号。该化合物还诱导细胞周期阻滞在G 2 / M期并抑制微管蛋白聚合,随后激活caspase-3和凋亡。高通量微管蛋白聚合分析表明,化合物3 h的抑制水平与康维他汀A-4相似。分子建模研究为化合物3a,3e和3h与微管蛋白的秋水仙碱结合口袋的良好结合提供了分子基础。
External Oxidant-Free Regioselective Cross Dehydrogenative Coupling of 2-Arylimidazoheterocycles and Azoles with H<sub>2</sub>
Evolution via Photoredox Catalysis
作者:Hong Chen、Hong Yi、Zilu Tang、Changliang Bian、Heng Zhang、Aiwen Lei
DOI:10.1002/adsc.201800531
日期:2018.9.3
In this work, we achieved a site‐selective amination of 2‐arylimidazoheterocycles on the C3 position using photo‐induced external oxidant‐free strategy. The C−N bond formation with H2evolution was realized via the oxidative C−H/N−H coupling. This protocol may have significant implications in the late‐modification of complicated drug molecules. In addition, we also used CV and DFT calculations to study