The synthesis of N-heteroaromatic compounds via an acceptorless dehydrogenative coupling process involving direct use of ammonia as the nitrogen source was explored. We report the synthesis of pyrazine derivatives from 1,2-diols and the synthesis of N-substituted pyrroles by a multicomponent dehydrogenative coupling of 1,4-diols and primary alcohols with ammonia. The acridine-based Ru-pincer complex
The Paal–Knorr reaction revisited. A catalyst and solvent-free synthesis of underivatized and N-substituted pyrroles
作者:Hyejin Cho、Richard Madden、Bilal Nisanci、Béla Török
DOI:10.1039/c4gc01523a
日期:——
A catalyst and solvent-free room temperature synthesis of pyrroles is described.
描述了一种无催化剂和溶剂的室温合成吡咯的方法。
Copper/Nitroxyl-Catalyzed Synthesis of Pyrroles by Oxidative Coupling of Diols and Primary Amines at Room Temperature
作者:Weiru Fu、Lina Zhu、Shangzhi Tan、Zhengjia Zhao、Xiangzhu Yu、Lianyue Wang
DOI:10.1021/acs.joc.2c01646
日期:2022.10.7
The Cu/ABNO-catalyzed aerobicoxidative coupling of diols and primary amines to access N-substituted pyrroles is highlighted (ABNO = 9-azabicyclo[3.3.1]nonane N-oxyl). The reaction proceeds at roomtemperature with an O2 balloon as the oxidant using commercially available materials as the substrates and catalysts. The catalyst system is characterized by a broad range of substrates and a good tolerance
突出显示了 Cu/ABNO 催化的二醇和伯胺的需氧氧化偶联以获得 N 取代的吡咯(ABNO = 9-氮杂双环 [3.3.1] 壬烷N-氧基)。反应在室温下以 O 2气球作为氧化剂进行,使用市售材料作为底物和催化剂。该催化剂体系的特点是广泛的底物和对敏感官能团的良好耐受性。克级实验证明了该系统的实用性。
High pressure initiated solvent and catalyst-free instant Paal–Knorr reactions
作者:Guoshu Xie、Alexander Lazarev、Béla Török
DOI:10.1039/d2gc04753e
日期:2023.2.20
desired products that can be isolated without any purification. This study is the first report on high pressure-activated small molecule reactions when a pressure shock-like behavior was observed, namely several substrates reached quantitative yields in extremely short reaction times (1–10 s). The highpressure activation strategy could also be readily scaled up to preparative levels. The application of
Formation of <i>N</i>-Alkylpyrroles via Intermolecular Redox Amination
作者:Nirmal K. Pahadi、Miranda Paley、Ranjan Jana、Shelli R. Waetzig、Jon A. Tunge
DOI:10.1021/ja907357g
日期:2009.11.25
A wide variety of aldehydes, ketones, and lactols undergo redox amination when allowed to react with 3-pyrroline in the presence of a mild Bronsted acid catalyst. This reaction utilizes the inherent reducing power of 3-pyrroline to perform the equivalent of a reductive amination to form alkyl pyrroles. In doing so, the reaction avoids stoichiometric reducing agents that are typically associated with reductive aminations. Moreover, the redox amination protocol allows access to alkyl. pyrroles that cannot be made via standard reductive amination.