作者:Y. T. Duan、T. H. Parmar、C. B. Sangani、A. S. Shah、R. K. Ameta
DOI:10.1134/s107042802005019x
日期:2020.5
AbstractA simple one-pot synthesis of N-substituted benzimidazoles from aromatic carboxylic acids and aromatic 1,2-diamines in the presence of 1-[bis(dimethylamino)methylene]-1H-1,2,3-triazolo[4,5-b]pyridinium 3-oxide hexafluorophosphate/hydroxybenzotriazole (HATU/HOBT) and N,N-diisopropylethylamine in DMF at 100°C, featuring good to excellent yields and easy workup, is developed. The protocol can
摘要在1- [双(二甲基氨基)亚甲基] -1 H -1,2,3-三唑[4,5 ]存在下,由芳族羧酸和芳族1,2-二胺简单地一锅合成N-取代的苯并咪唑- b ]吡啶鎓-3-氧化物六氟磷酸盐/羟基苯并三唑(HATU / HOBT)和ñ,ñ二异丙基乙胺在DMF中在100℃下,具有良好至优异的产量和容易后处理,进行显影。可以将方案缩放为克量,并且不需要色谱纯化。
Organophotoredox assisted cyanation of bromoarenes <i>via</i> silyl-radical-mediated bromine abstraction
作者:Maniklal Shee、Sk. Sheriff Shah、N. D. Pradeep Singh
DOI:10.1039/d0cc00163e
日期:——
The insertion of a nitrile (–CN) group into arenes through the direct functionalization of the C(sp2)–Br bond is a challenging reaction. Herein, we report an organophotoredox method for the cyanation of aryl bromides using the organic photoredox catalyst 4CzIPN and tosyl cyanide (TsCN) as the nitrile source. A photogenerated silyl radical, via a single electron transfer (SET) mechanism, was employed
Ligand-Free CuO Nanospindle Catalyzed Arylation of Heterocycle C–H Bonds
作者:Wu Zhang、Qinglong Zeng、Xinming Zhang、Yujie Tian、Yun Yue、Yujun Guo、Zhenghua Wang
DOI:10.1021/jo200452x
日期:2011.6.3
have been developed to efficiently catalyze the direct arylation of heterocycle C–H bonds with moderate to excellent yields. This reaction can be applied to heterocycles such as benzoxazole, benzothiazole, and 1-methylbenzimidazole in the presence of a more environmentally friendly inorganic base like K2CO3 underligand-free catalytic conditions. In addition, the catalyst can be recycled and reused
CuO纳米锭已经被开发出来,可以以中等到极高的产率有效地催化杂环C–H键的直接芳基化。该反应可在无配体的催化条件下,在更环境友好的无机碱(如K 2 CO 3)存在下,应用于诸如苯并恶唑,苯并噻唑和1-甲基苯并咪唑的杂环上。另外,催化剂可以循环使用,而催化活性没有明显降低。
Photoinduced C–H arylation of 1,3-azoles via copper/photoredox dual catalysis
作者:Sven Trienes、Jiawei Xu、Lutz Ackermann
DOI:10.1039/d4sc00393d
日期:——
The visible light-induced C–Harylation of azoles has been accomplished by dual-catalytic system with the aid of an inexpensive ligand-free copper(I)-catalyst in combination with a suitable photoredox catalyst. An organic photoredox catalyst, 10-phenylphenothiazine (PTH), was identified as effective, cost-efficient and environmentally-benign alternative to commonly-used, expensive Ir(III)-based complexes
可见光诱导的唑类 C-H 芳基化反应是通过双催化系统借助廉价的无配体铜 ( I ) 催化剂与合适的光氧化还原催化剂的结合来完成的。有机光氧化还原催化剂 10-苯基吩噻嗪 (PTH) 被认为是常用、昂贵的 Ir( III ) 基络合物的有效、经济且环保的替代品。该方法被证明适用于各种唑衍生物的C-H芳基化,包括恶唑、苯并恶唑、噻唑、苯并噻唑以及更具挑战性的咪唑和苯并咪唑。此外,复杂分子的衍生化和天然产物Balsoxin的克级合成反映了所开发策略的合成效用。机理研究表明以芳基自由基为关键中间体的单电子转移(SET)机制。