使用有效的钯-化合物以高收率合成了一系列新的4-碱基聚吡咯并[1,2- a ]喹喔啉衍生物,生物碱chimanine B的原始和结构类似物以及先前描述的4-烯基吡咯并[1,2- a ]喹喔啉。催化了铃木-宫浦的交叉偶联反应。测试了这些新化合物对三种利什曼原虫属物种的体外抗寄生虫活性。株。生物学结果表明,它对大麦草,墨西哥麦草和多诺氏乳杆菌的前鞭毛体形式具有活性,IC 50范围为1.2至14.7μM。在尝试调查我们的吡咯并[1,2- a]喹喔啉衍生物是一种广谱抗原生动物化合物,对一种布鲁氏锥虫菌株具有活性,还研究了W2和3D7恶性疟原虫菌株。同时,在鼠J774和人HepG2细胞系上评估了这些分子的体外细胞毒性。这些新型合成化合物的结构-活性关系在此进行了讨论。
Elemental Sulfur Mediated Synthesis of Pyrrolo[1,2-a]quinoxalines from 1-(2-Nitroaryl)pyrroles
作者:Tung T. Nguyen、Nam T. S. Phan、Tuan H. Ho、Nhu T. A. Phan、Thuyen T. C. Ho、Duyen L. M. Tran
DOI:10.1055/a-1534-0466
日期:2021.11
Methods to afford pyrrolo[1,2-a]quinoxalines often require the use of prefunctionalized aniline precursors, transition metals, and/or harsh conditions. Herein we describe a simple coupling of 1-(2-nitroaryl)pyrroles and arylacetic acids, in the presence of elemental sulfur, to furnish the fused heterocycles in good yields. The conditions are compatible with many functionalities including ester, nitrile
Direct Synthesis of Pyrrolo[1,2-α]quinoxalines <i>via</i> Iron-Catalyzed Transfer Hydrogenation between 1-(2-Nitrophenyl)pyrroles and Alcohols
作者:Simin Chun、Jiwon Ahn、Ramachandra Reddy Putta、Seok Beom Lee、Dong-Chan Oh、Suckchang Hong
DOI:10.1021/acs.joc.0c02145
日期:2020.12.4
Herein, we describe novel iron-catalyzed transferhydrogenation between alcohols and 1-(2-nitrophenyl)pyrroles for the synthesis of pyrrolo[1,2-α]quinoxalines. The tricarbonyl (η4-cyclopentadienone) iron complex catalyzed the oxidation of alcohols and the reduction of nitroarenes, and the corresponding aldehydes and aniline were generated in situ. The resulting Pictet–Spengler-type annulation/oxidation
Efficient synthesis of pyrrolo[1,2-a]quinoxalines catalyzed by a Brønsted acid through cleavage of C–C bonds
作者:Caixia Xie、Lei Feng、Wanli Li、Xiaojun Ma、Xinkun Ma、Yihan Liu、Chen Ma
DOI:10.1039/c6ob01401a
日期:——
An efficient and convenient one-pot domino reaction for the direct synthesis of pyrrolo[1,2-a]quinoxalines has been developed. This approach utilizes an imine formation reaction, SEAr reaction and cleavage of C–C bonds catalyzed by a Brønsted acid. β-Diketones and β-keto esters are both well tolerated to give the corresponding products in moderate to excellent yields.
已经开发了用于直接合成吡咯并[1,2- a ]喹喔啉的有效且方便的一锅多米诺反应。该方法利用用于形成亚胺的反应,S È氩反应和裂解由布朗斯台德酸催化的C-C键。β-二酮和β-酮酯均具有良好的耐受性,可以以中等至极好的收率得到相应的产物。
Mo–Catalyzed One‐Pot Synthesis of
<i>N</i>
‐Polyheterocycles from Nitroarenes and Glycols with Recycling of the Waste Reduction Byproduct. Substituent‐Tuned Photophysical Properties
作者:Raquel Hernández‐Ruiz、Rubén Rubio‐Presa、Samuel Suárez‐Pantiga、María R. Pedrosa、Manuel A. Fernández‐Rodríguez、M. José Tapia、Roberto Sanz
DOI:10.1002/chem.202102000
日期:2021.9.24
reduction–imine formation–intramolecular cyclization–oxidation for the general synthesis of a wide variety of biologically relevant N-polyheterocycles, such as quinoxaline- and quinoline-fused derivatives, and phenanthridines, is reported. A simple, easily available, and environmentally friendly dioxomolybdenum(VI) complex has proven to be a highly efficient and versatile catalyst for transforming a
Catalyst‐Controlled Chemodivergent Annulation to Indolo/Pyrrolo‐Fused Diazepine and Quinoxaline
作者:Sandip Dhole、Wei‐Jung Chiu、Chung‐Ming Sun
DOI:10.1002/adsc.201900088
日期:2019.6.18
Catalyst‐controlled chemodivergent annulation between o‐indolo anilines and diazo compounds has explored for the synthesis of indolo‐fused diazepine and quinoxaline. Under the Rh(III) catalyst, reaction proceeded through the free amine assisted C2−H activation followed by amidation leading to the diazepino[1,7‐a]indole in a highly selective manner. While with Ru(II) catalyst, reaction involves formation
在邻吲哚苯胺和重氮化合物之间进行催化剂控制的化学发散环化反应已被研究用于合成吲哚稠合的二氮杂and和喹喔啉。在Rh(III)催化剂下,反应通过游离胺辅助的C2-H活化进行,然后进行酰胺化反应,从而以高度选择性的方式生成重氮庚并[1,7- a ]吲哚。当使用Ru(II)催化剂时,反应涉及形成Ru-卡宾配合物,然后插入-NH 2基团,并通过金属茂型反应进行级联环化,通过β-氢化物消除作用制得吲哚[1,2- a]。以喹喔啉为主要产品。该策略指导模块化方法构建独特的吲哚并结合的二氮杂/喹喔啉以及吡咯并并的二氮杂/喹喔啉骨架,并具有极高的产率。