[Fe(F20TPP)Cl] catalyzed intramolecular C–N bond formation for alkaloid synthesis using aryl azides as nitrogen source
作者:Yungen Liu、Jinhu Wei、Chi-Ming Che
DOI:10.1039/c0cc01825b
日期:——
tetrahydroquinolines, dihydroquinazolinones and quinazolinones have been accomplished in moderate to excellent yields via [Fe(F(20)TPP)Cl] catalyzed intramolecular C-N bond formation usingarylazides as nitrogensource.
products 20–22, together with the intramolecular CH insertion product with an intact cyclopropyl ring 19. On the basis of these observations, we concluded that the intramolecular CH insertion of the nitrene proceeds primarily by the hydrogen abstraction–recombination mechanism. We propose, however, a small contribution of the concerted mechanism to the intramolecular CH insertion, based on the solvent dependence
Mononuclear complexes of a tridentate redox-active ligand with sulfonamido groups: structure, properties, and reactivity
作者:Sarah A. Cook、Justin A. Bogart、Noam Levi、Andrew C. Weitz、Curtis Moore、Arnold L. Rheingold、Joseph W. Ziller、Michael P. Hendrich、A. S. Borovik
DOI:10.1039/c7sc05445a
日期:——
NEt4[MII(ibaps)bpy] (M = Fe (1) or Co (1-Co)) salts. The FeII salt exhibited rich electrochemical properties and could be chemicallyoxidized by 1 and 2 equiv. of ferrocenium to form singly and doubly oxidized species, respectively. The reactivity of 1 towards intramolecular C–H bond amination of aryl azides at benzylic and aliphatic carbon centers was explored, and moderate to good yields of the resulting indoline
地球上丰富的第一行过渡金属分子配合物的设计可以催化多电子C-H键活化过程,对于实现目标分子的高效、低成本合成具有重要意义。为了克服这些金属进行单电子过程的倾向,氧化还原活性配体被用来提供额外的电子当量。在此,我们报道了一种新型氧化还原活性配体 [ibaps] 3−的合成,它通过三个阴离子氮原子以子午方式与Fe II和 Co II等过渡金属结合,并为其他配体提供额外的配位位点。本研究采用中性二齿配体2,2′-联吡啶(bpy)来完成金属离子的配位球并形成NEt 4 [ M II ( ibaps)bpy] (M = Fe ( 1 ) 或 Co ( 1 -Co))盐。Fe II盐表现出丰富的电化学性能,可以被1和2当量的化学氧化。二茂铁分别形成单氧化和双氧化物质。探索了1对芳基叠氮化物在苯甲基和脂肪族碳中心进行分子内 C-H 键胺化的反应性,并获得了中等至良好的二氢吲哚产物产率。
作者:Omar Villanueva、Nina Mace Weldy、Simon B. Blakey、Cora E. MacBeth
DOI:10.1039/c5sc01162k
日期:——
A dinuclear Co(ii) complex supported by a modular, tunable redox-active ligand system is capable of selective C–H amination to form indolines from aryl azides in good yields at low (1 mol%) catalyst loading.
Chiral Iron Porphyrins Catalyze Enantioselective Intramolecular C(sp
<sup>3</sup>
)−H Bond Amination Upon Visible‐Light Irradiation
作者:Hua‐Hua Wang、Hui Shao、Guanglong Huang、Jianqiang Fan、Wai‐Pong To、Li Dang、Yungen Liu、Chi‐Ming Che
DOI:10.1002/anie.202218577
日期:——
An efficient method has been developed for the chiraliron porphyrin catalyzed transformation of aryl and arylsulfonyl azides into chiral indolines and sultams, respectively. The reaction proceeds upon visible light irradiation and with high yields and excellent enantioselectivities.