Synthesis of new pyrrolo[1,2-a]quinoxalines: potential non-peptide glucagon receptor antagonists
摘要:
Synthesis of new pyrrolo[1,2-a]quinoxaline derivatives was achieved starting from various nitroanilines or orthophenyle- nediamines. Their affinity towards glucagon receptors was evaluated. (C) Elsevier, Paris.
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。
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
One-Pot Synthesis of Pyrrolo[1,2-<i>a</i>]quinoxaline Derivatives via a Copper-Catalyzed Aerobic Oxidative Domino Reaction
作者:Huanhuan Liu、Tiantian Duan、Zeyuan Zhang、Caixia Xie、Chen Ma
DOI:10.1021/acs.orglett.5b01167
日期:2015.6.19
A copper-catalyzed process for the synthesis of pyrrolo[1,2-a]quinoxalines from readily available α-amino acids and 1-(2-halophenyl)-1H-pyrroles is described. Different functional groups were well tolerated to give the corresponding products.
描述了一种铜催化的方法,该方法由容易获得的α-氨基酸和1-(2-卤代苯基)-1 H-吡咯合成吡咯并[1,2- a ]喹喔啉。不同的官能团具有良好的耐受性,可提供相应的产品。