Regioselective 6-endo-dig iodocyclization: an accessible approach for iodo-benzo[a]phenazines
作者:Sonu Kumar、Mohammad Mujahid、Akhilesh K. Verma
DOI:10.1039/c7ob00671c
日期:——
A facile approach for the synthesis of substituted iodo-benzo[a]phenazines from 2-aryl-3-(aryl/alkylethynyl)quinoxalines via 6-endo-dig ring closure has been described under mild reaction conditions. Iodocyclization proceeds through the iodonium ion intermediate followed by nucleophilic cyclization with the C–H bond of the arene. Furthermore, the resulting 6-iodo-5-aryl/alkyl benzo[a]phenazine derivatives
已经描述了在温和的反应条件下通过6-内挖开环从2-芳基-3-(芳基/烷基乙炔基)喹喔啉合成取代的碘代-苯并[ a ]吩嗪的简便方法。碘环化过程通过碘鎓离子中间体进行,然后通过芳烃的C–H键进行亲核环化。此外,所得的6-碘-5-芳基/烷基苯并[ a ]吩嗪衍生物允许通过采用各种偶联反应进行结构多样化。通过该化合物的X射线晶体学研究证实了碘-苯并[ a ]吩嗪的结构。
Nucleophilic Substitution on 2-Monosubstituted Quinoxalines Giving 2,3-Disubstituted Quinoxalines: Investigating the Effect of the 2-Substituent
作者:Ndumiso Ndlovu、Winston Nxumalo
DOI:10.3390/molecules21101304
日期:——
substituent at the 2-position of mono-substituted quinoxalines in the synthesis of di-substituted quinoxaline derivatives via nucleophilic substitution reactions, is reported. Di-substituted quinoxalines bearing aryl-alky, aryl-aryl, aryl-heteroaryl, aryl-alkynyl, and amino-alkyl substituents were prepared in moderate to good yields. 2-Monosubstituted quinoxalines bearing a phenyl and butyl substituent reacted
Lewis Acid Catalyzed C-N Bond Formation: Synthesis of Quinoxalines via CuX (X = Cl, Br, I) Catalyzed Cyclotrimerization of Alkynes with o-Phenylendiamines
作者:Ying Liang、Pei-Zhen Liu、Chan-Cui Wu、Qian Zhang
DOI:10.14233/ajchem.2015.18532
日期:——
An efficient one-pot cycloisomerization reaction has been developed for the synthesis of quinoxaline derivatives from alkynes and o-phenylendiamines using CuX (X = Cl, Br, I) as a catalyst. This method provides a flexible and rapid route to synthesize quinoxaline derivatives.
Coordinated assembly of a new 3D mesoporous Fe<sub>3</sub>O<sub>4</sub>@Cu<sub>2</sub>O–graphene oxide framework as a highly efficient and reusable catalyst for the synthesis of quinoxalines
作者:Zhiyi Wang、Guowen Hu、Jian Liu、Weisheng Liu、Haoli Zhang、Baodui Wang
DOI:10.1039/c5cc00250h
日期:——
A novel 3D mesoporous Fe3O4@Cu2O–graphene oxide framework as a highly efficient and reusable catalyst was synthesized.
一种新型的3D介孔Fe3O4@Cu2O-氧化石墨烯框架作为高效可重复使用的催化剂被合成。
Oxidative Coupling of Terminal Alkyne with α-Hydroxy Ketone: An Expedient Approach toward Ynediones
作者:Zeguang Zhang、Xuefeng Jiang
DOI:10.1021/ol502298a
日期:2014.9.5
An efficient and mild copper-catalyzed one-pot approach toward ynediones has been established. A variety of ynediones were constructed directly through oxidative coupling of alkyne with alpha-hydroxy ketone. Oxygen-oxidizing and neutral conditions in one-pot for a wide range of substrates including natural product derivatives make this transformation highly efficient and practical. On the basis of control experiments, in situ IR measurements, and isotopic labeling experiments, a plausible mechanism involving intermediate phenylglyoxal was drawn. Applications by synthesis of various heterocycles were also investigated.