Organic synthesis in deep eutectic solvents: Paal–Knorr reactions
摘要:
Deep eutectic solvents (the combination of either urea or glycerol with choline chloride) are effective solvents/catalysts for Paal-Knorr reactions to form pyrroles of furans. The reaction conditions are quite mild and do not require the addition of an additional Bronsted or Lewis acid catalyst. Given the inexpensive, non-toxic, and recyclable nature of the DES, these reaction conditions are simple and highly environmentally friendly. (c) 2013 Elsevier Ltd. All rights reserved.
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
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。
Pyrrole synthesis
申请人:Ohrlein Reinhold
公开号:US20050014954A1
公开(公告)日:2005-01-20
The invention relates to a novel process for the preparation of N-substituted pyrroles, especially of formula (V), wherein the radicals are as defined in the description, by intermolecular aza-Wittig reaction starting from organic azides and 1,4-dioxo compounds. The invention relates also to novel iminophosphorane intermediates for this synthesis. The resulting pyrroles are useful, for example, in the organic synthesis of pharmaceuticals or other active substances and chemicals.
[EN] PYRROLE SYNTHESIS<br/>[FR] SYNTHESE DE PYRROLES
申请人:CIBA SC HOLDING AG
公开号:WO2003044011A1
公开(公告)日:2003-05-30
The invention relates to a novel process for the preparation of N-substituted pyrroles, especially of formula (V), wherein the radicals are as defined in the description, by intermolecular aza-Wittig reaction starting from organic azides and 1,4-dioxo compounds. The invention relates also to novel iminophosphorane intermediates for this synthesis. The resulting pyrroles are useful, for example, in the organic synthesis of pharmaceuticals or other active substances and chemicals.