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
Synthesis of 4-Aryl Pyrrolo[1,2-α]quinoxalines <i>via</i> Iron-Catalyzed Oxidative Coupling from an Unactivated Methyl Arene
作者:Jiwon Ahn、Seok Beom Lee、Injae Song、Simin Chun、Dong-Chan Oh、Suckchang Hong
DOI:10.1021/acs.joc.1c00371
日期:2021.6.4
Herein, we describe the direct synthesis of pyrrolo[1,2-α]quinoxaline via oxidative coupling between methyl arene and 1-(2-aminophenyl) pyrroles. Oxidation of the benzylic carbon of the methyl arene was achieved by di-t-butyl peroxide in the presence of an iron catalyst, followed by conversion to an activated aldehyde in situ. Oxygen played a crucial role in the oxidation process to accelerate benzaldehyde
KI-Mediated One-Pot Transition-Metal-Rree Synthesis of 4-Phenylpyrrolo[1,2-<i>a</i>
]quinoxalines
作者:Shichen Li、Caixia Xie、Xianglong Chu、Zhen Dai、Lei Feng、Chen Ma
DOI:10.1002/ejoc.202000791
日期:2020.8.23
This protocol offered an eco‐friendly and convenient method for the synthesis of pyrrolo[1,2‐a]quinoxalines. In this process, new C=N and C–C bond were formed in mild conditions. A series of pyrrolo[1,2‐a]quinoxaline derivatives were obtained in moderate to good yields.
该方案为吡咯并[1,2- a ]喹喔啉的合成提供了一种生态友好的简便方法。在此过程中,在温和条件下形成了新的C = N和C–C键。以中等至良好的产率获得了一系列吡咯并[1,2- a ]喹喔啉衍生物。
Unexpected activated carbon-catalyzed pyrrolo[1,2-a]quinoxalines synthesis in water
作者:Qi Sun、Liyan Liu、Yu Yang、Zhenggen Zha、Zhiyong Wang
DOI:10.1016/j.cclet.2019.04.007
日期:2019.7
Abstract An interesting and recyclable activated carbon/water catalytic system for efficient synthesis of pyrrolo[1,2-a]quinoxaline derivatives was developed. The intramolecular C N and C C bond can be easily constructed in water under mild condition. This reaction features a broad substrate scope, a good tolerance to water and air, metal-free, additive-free and redox reagent-free.
One-Pot Synthesis of Pyrrolo[1,2-<i>a</i>]quinoxaline Derivatives via Iron-Promoted Aryl Nitro Reduction and Aerobic Oxidation of Alcohols
作者:Maria de Fatima Pereira、Valérie Thiéry
DOI:10.1021/ol302006b
日期:2012.9.21
describe a new one-pot method to synthesize 4,7-substituted pyrrolo[1,2-a]quinoxalines and related heterocyles through a cascade of redox reactions/imine formation/intramolecular cyclization. This procedure tolerates readily available substituted 1-(2-nitrophenyl)pyrrole derivatives and aliphatic or benzylic alcohols as starting materials using iron powder and acidic conditions. This is the first example
在这里,我们描述了一种新的一锅法,通过级联的氧化还原反应/亚胺形成/分子内环化反应来合成4,7-取代的吡咯并[1,2- a ]喹喔啉和相关杂环。该方法耐受使用铁粉和酸性条件容易获得的取代的1-(2-硝基苯基)吡咯衍生物和脂族或苄基醇作为起始原料。这是在一个罐中通过铁介导的芳基硝基还原和酒精的好氧氧化构造N-杂环的第一个例子。