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。
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.
Cu–N‐heterocyclic carbene‐catalysed synthesis of 2‐aryl‐3‐(arylethynyl)quinoxalines from one‐pot tandem coupling of
<i>o</i>
‐phenylenediamines and terminal alkynes
A series of new benzimidazolium chlorides bearing N,N′‐benzyl, 2,4,6‐trimethylbenzyl and 2,4,6‐triisopropylbenzyl substituents have been designed and synthesized from various o‐phenylenediamines. Subsequently, corresponding Cu‐based N‐heterocyclic carbenes (NHCs) were generated in situ in the reaction medium which represents a new application of NHCs exploiting distinct catalytic property towards intermolecular
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。
Electrophile-Induced Cyclization of 3-Alkynyl-2-arylquinoxalines: A Method for Benzo- and Naphthophenazine Synthesis
作者:Anna V. Gulevskaya
DOI:10.1002/ejoc.201600660
日期:2016.8
A facile synthesis of benzo[a]‐, naphtho[1,2‐a]‐ and naphtho[2,1‐a]phenazines by ICl‐promoted 6‐endo‐dig cyclization of 3‐alkynyl‐2‐arylquinoxalines is reported. For 2‐(4‐methoxyphenyl)‐3‐(p‐tolylethynyl)quinoxaline, the treatment with ICl leads to the alternative 5‐endo‐dig cyclization followed by demethylation of the methoxy group to give a spirocyclohexadienone derivative.