已经开发了铁促进的吡咯并[1,2- a ]喹喔啉衍生物的构建方法。氯化铁在反应中用作促进剂和路易斯酸。溶剂同时提供了相应的碳源。大多数带有末端甲基的溶剂,包括醚,胺和二甲基亚砜,在通过C–H(sp 3)胺化/ C–O或C–N(C–S )分裂。该方法适用于多种吡咯并[1,2- a ]喹喔啉和吲哚并[1,2- a ]喹唑啉底物。
PEG-400 as a carbon synthon: highly selective synthesis of quinolines and methylquinolines under metal-free conditions
作者:Chengcheng Ding、Shichen Li、Kaili Feng、Chen Ma
DOI:10.1039/d1gc01617b
日期:——
The remarkable feature of this work was using green, non-toxic PEG-400 as a carbon synthon for highly selective synthesis of quinolines (quinoxalines) and methylquinolines (methylquinoxalines) under metal-free conditions.
<i>N</i>,<i>N</i>-Dimethylformamide as Carbon Synthons for the Synthesis of <i>N</i>-Heterocycles: Pyrrolo/Indolo[1,2-<i>a</i>]quinoxalines and Quinazolin-4-ones
作者:Shichen Li、Jianing Ren、Chengcheng Ding、Yishou Wang、Chen Ma
DOI:10.1021/acs.joc.1c02067
日期:2021.12.3
N-dimethylformamide (DMF) as synthetic precursors contributing especially the methyl, acyl, and amino groups has played a significant role in heterocycle syntheses and functionalization. In this protocol, a wide range of pyrrolo/indolo[1,2-a]quinoxalines and quinazolin-4-ones were obtained in moderate to good yields by using elemental iodine without any metal or peroxides. We considered that N-methyl and
N , N-二甲基甲酰胺 (DMF) 作为合成前体,尤其是甲基、酰基和氨基,在杂环合成和功能化中发挥了重要作用。在该协议中,通过使用不含任何金属或过氧化物的元素碘,以中等至良好的收率获得了范围广泛的 pyrrolo/indolo[1,2 - a ]quinoxalines 和 quinazolin-4-ones。我们认为DMF的N-甲基和N-酰基通过不同的机理分别参与并完成反应,这表明DMF的潜力仍有待探索。
Dimethyl Sulfoxide Involved One-Pot Synthesis of Quinoxaline Derivatives
作者:Caixia Xie、Zeyuan Zhang、Danyang Li、Jian Gong、Xushuang Han、Xuan Liu、Chen Ma
DOI:10.1021/acs.joc.6b02977
日期:2017.4.7
An efficient, green, and novel method for the synthesis of N-heterocycle-fused quinoxalines is reported herein. Dimethyl sulfoxide was used as both a reactant and a solvent in this reaction. A wide range of products in moderate to excellent yields were obtained, including pyrrolo[1,2-a]quinoxalines, indolo[1,2-a]quinoxalines, 1H-pyrrolo[3,2-c]quinolines, and benzo[4,5]imidazo[1,2-c]quinazolines.
本文报道了合成N-杂环融合的喹喔啉的有效,绿色和新颖的方法。在该反应中,二甲基亚砜既用作反应物又用作溶剂。获得了各种中等至优异收率的产品,包括吡咯并[1,2- a ]喹喔啉,吲哚并[1,2- a ]喹喔啉,1 H-吡咯并[3,2- c ]喹啉和苯并[ 4,5]咪唑并[1,2- c ]喹唑啉。
Application of <i>N</i>,<i>N</i>-Dimethylethanolamine as a One-Carbon Synthon for the Synthesis of Pyrrolo[1,2-<i>a</i>]quinoxalines, Quinazolin-4-ones, and Benzo[4,5]imidazoquinazolines <i>via</i> [5 + 1] Annulation
作者:Meiqi Geng、Minzhao Huang、Jinqiang Kuang、Weiwei Fang、MaoZhong Miao、Yongmin Ma
DOI:10.1021/acs.joc.2c02079
日期:2022.11.4
synthetic chemistry. In this report, a Cu(II)-catalyzed green and efficient synthesis of pyrrolo[1,2-a]quinoxaline, quinazolin-4-one, and benzo[4,5]imidazoquinazoline derivatives was developed, employing N,N-dimethylethanolamine (DMEA) as a C1 synthon. Green oxidant O2 is critical in these transformations, facilitating the formation of a keyintermediate─a reactive iminium ion. The method conducted
N-杂环的合成是合成化学的重要组成部分。在本报告中,采用N,N-二甲基乙醇胺开发了 Cu(II) 催化绿色高效合成吡咯并[1,2 - a ]喹喔啉、喹唑啉-4-酮和苯并[4,5]咪唑并喹唑啉衍生物(DMEA) 作为 C1 合成子。绿色氧化剂 O 2在这些转化过程中至关重要,它促进了关键中间体的形成——活性亚胺离子。在温和条件下进行的方法与多种功能组兼容,为以前开发的协议提供了一个有吸引力的替代方案。
Copper-Catalyzed Annulation of 2-Formylazoles with <i>o</i>-Aminoiodoarenes
作者:Jonathan T. Reeves、Daniel R. Fandrick、Zhulin Tan、Jinhua J. Song、Heewon Lee、Nathan K. Yee、Chris H. Senanayake
DOI:10.1021/jo9025644
日期:2010.2.5
In the presence of catalytic CuI and sparteine, 2-formyl-pyrroles can be annulated with o-aminoiodoarenes to give Substituted pyrrolo[1,2-a]quinoxalines and related heterocycles. The reaction also works for annulation of 2-formylindoles, 2-formylimidazole, 2-formylbenzimidazole, and a 3-formylpyrazole.