Parallel Synthesis of a Library of Benzoxazoles and Benzothiazoles Using Ligand-Accelerated Copper-Catalyzed Cyclizations of <i>ortho</i>-Halobenzanilides
作者:Ghotas Evindar、Robert A. Batey
DOI:10.1021/jo051927q
日期:2006.3.1
A general method for the formation of benzoxazoles via a copper-catalyzed cyclization of ortho-haloanilides is reported. This approach complements the more commonly used strategies for benzoxazole formation which require 2-aminophenols as substrates. The reaction involves an intramolecular C−O cross-coupling of the ortho-haloanilides and is believed to proceed via an oxidative insertion/reductive elimination
Synthesis of Benz-Fused Azoles via C-Heteroatom Coupling Reactions Catalyzed by Cu(I) in the Presence of Glycosyltriazole Ligands
作者:Nidhi Mishra、Anoop S. Singh、Anand K. Agrahari、Sumit K. Singh、Mala Singh、Vinod K. Tiwari
DOI:10.1021/acscombsci.9b00004
日期:2019.5.13
and contain multiple metal-binding units that may assist in metal-mediated catalysis. Azide derivatives of d-glucose have been converted to their respective aryltriazoles and screened as ligands for the synthesis of 2-substituted benz-fused azoles and benzimidazoquinazolinones by Cu-catalyzed intramolecular Ullmann type C-heteroatom coupling. Good to excellent yields for a variety of benz-fused heterocyles
previously reported. Although most of the benzimidazole derivatives showed strong inhibitory activity in low micromolar potency, 2-(4-methoxybenzyl)-1H-benzo[d]imidazole (3m; IC50 = 1.7 μM) and 2-(2-methoxybenzyl)-1H-benzo[d]imidazole (3n; IC50 = 2.4 μM) showed the best inhibition. The structure activity relationship revealed that 2-benzylbenzimidazole scaffold with hydrogen bonding acceptor on phenyl
为了找到新的核因子κB活性抑制剂,合理设计,合成和系统研究了一系列苯并咪唑衍生物对RAW 264.7细胞中LPS诱导的NF-κB抑制的体外活性,基于基于柔性查尔酮JSH的SEAP分析(先前报道的((E)-1-(2-羟基-6-(异戊氧基)苯基)-3-(4-羟基苯基)丙-2-烯-1-酮)。尽管大多数苯并咪唑衍生物在低微摩尔浓度下均显示出强大的抑制活性,但是2-(4-甲氧基苄基)-1 H-苯并[ d ]咪唑(3m; IC 50 = 1.7μM)和2-(2-甲氧基苄基)-1 H-苯并[ d ]咪唑(3n ; IC50 = 2.4μM)表现出最好的抑制作用。结构活性关系表明,在苯环上带有氢键受体的2-苄基苯并咪唑支架以药效团的形式出现。
Copper-catalyzed regioselective 2-amination of o-haloanilides with aqueous ammonia
作者:Yan-Ling Tang、Mei-Ling Li、Jin-Chun Gao、Yun Sun、Lu Qu、Feng Huang、Ze-Wei Mao
DOI:10.1016/j.tetlet.2021.153001
日期:2021.4
An efficient Cu(II)-vasicine catalytic system has been developed for intramolecular CN bond formation. In this way, regioselective 2-amination of o-haloanilides with aqueous ammonia in EtOH has been achieved. This strategy provides several advantages, such as good regioselectivity, high yields and functional group tolerance.