Visible light promoted tandem dehydrogenation-deaminative cyclocondensation under aerobic conditions for the synthesis of 2-aryl benzimidazoles/quinoxalines from <i>ortho</i>-phenylenediamines and arylmethyl/ethyl amines
作者:Firdoos Ahmad Sofi、Rohit Sharma、Ravi Rawat、Asit K. Chakraborti、Prasad V. Bharatam
DOI:10.1039/d0nj03002c
日期:——
Visible light promoted dominosynthesis of 2-aryl benzimidazoles is reported through the reaction of ortho-phenylenediamines and arylmethyl amines underaerobicconditions. The methodology has wide substrate scope and tolerates a wide range of functional groups affording the products in high yields. The use of arylethyl amines instead of arylmethyl amines gives 2-aryl quinoxalines.
First Example of Quinoxaline-Directed C-H Activation: A Novel Method for Acetoxylation of Arenes
作者:B. Reddy、K. Ramesh、J. Yadav
DOI:10.1055/s-0030-1259292
日期:2011.1
2-Aryl- and 2,3-diarylquinoxalines undergo smooth acetoxylation in the presence of 5 mol% Pd(OAc)2 and a stoichiometric amount of PhI(OAc)2 via C-H activation to produce the corresponding acetoxy-susbstituted quinoxaline derivatives in excellent yields with high regioselectivity.
We have designed a general, inexpensive, and versatile method for the synthesis of (1H-benzo[d]imidazol-2-yl)(phenyl)methanone and the formation of C–N bonds via an aromaticaldehyde and o-phenylenediamine. In the presence of N,N-dimethylformamide/sulfur, (1H-benzo[d]imidazol-2-yl)(phenyl)methanone was obtained; however, in the absence of sulfur, quinoxaline was obtained in 1,4-dioxane. A wide range
我们设计了一种通用,廉价且通用的方法,用于合成(1 H-苯并[ d ]咪唑-2-基)(苯基)甲酮并通过芳香醛和邻苯二胺形成C–N键。在N,N-二甲基甲酰胺/硫的存在下,得到(1H-苯并[ d ]咪唑-2-基)(苯基)甲酮。然而,在不存在硫的情况下,在1,4-二恶烷中获得了喹喔啉。在温和的条件下获得了广泛的喹喔啉和(1 H-苯并[ d ]咪唑-2-基)(苯基)亚甲酮。
A heterogeneous catalytic strategy for facile production of benzimidazoles and quinoxalines from primary amines using the Al-MCM-41 catalyst
This study reports a straightforward heterogeneous catalytic (Al-MCM-41) approach to synthesize nitrogen heterocycle moieties from primaryamines under solvent-free conditions. The Al-MCM-41 catalyst was prepared using a hydrothermal method and characterized by various analytical techniques. The probability and limitations of the catalytic methodology were presented with various substrates. The catalytic
Et3N-catalyzed oxidative dehydrogenative coupling of α-unsubstituted aldehydes and ketones with aryl diamines leading to quinoxalines using molecular oxygen as oxidant
作者:Chun Zhang、Zejun Xu、Liangren Zhang、Ning Jiao
DOI:10.1016/j.tet.2012.03.020
日期:2012.7
A novel Et3N-catalyzed oxidativedehydrogenative coupling of α-unsubstituted carbonyl compounds with aryl diamines leading to quinoxaline derivatives usingmolecularoxygen as oxidant has been developed. Six hydrogen dissociations involving 2 sp3 C–H bonds activation are realized under mild conditions in this approach. Plausible mechanism is proposed for this novel Et3N-catalyzed transformation on