摘要 我们在本文中描述了一种新型的TEMPO氧铵盐引发的亚胺的Pictet-Spengler反应,该反应是从羰基化合物和含吡咯或吲哚的底物就地产生的,以提供4,5-二氢吡咯并[1,2- a ]喹喔啉或5,6 -二氢吲哚并[1,2- a ]喹喔啉的收率为好至极好。此外,通过使用一当量的氧铵盐的环化-脱氢过程,一锅合成重要的生物学重要的喹喔啉。 我们在本文中描述了一种新型的TEMPO氧铵盐引发的亚胺的Pictet-Spengler反应,该反应是从羰基化合物和含吡咯或吲哚的底物就地产生的,以提供4,5-二氢吡咯并[1,2- a ]喹喔啉或5,6 -二氢吲哚并[1,2- a ]喹喔啉的收率为好至极好。此外,通过使用一当量的氧铵盐的环化-脱氢过程,一锅合成重要的生物学重要的喹喔啉。
通过结合使用B(C 6 F 5)3和三(4-甲氧基苯基)膦来提供相应的1,2,3,成功地实现了吡咯并[1,2- a ]喹喔啉的无金属加氢, 3a,4,5-六氢吡咯并[1,2- a ]喹喔啉的产率为59-99%。对于4-芳基取代的吡咯并[1,2- a ]喹喔啉,获得了高的顺式选择性,但是对于4-甲基取代的底物却获得了反式选择性。
Lewis Acid-Catalyzed Selective Synthesis of Diversely Substituted Indolo- and Pyrrolo[1,2-a]quinoxalines and Quinoxalinones by Modified Pictet-Spengler Reaction
作者:Akhilesh K. Verma、Rajeev R. Jha、V. Kasi Sankar、Trapti Aggarwal、Rajendra P. Singh、Ramesh Chandra
DOI:10.1002/ejoc.201101013
日期:2011.12
An efficient tandem process for the selectivesynthesis of 1,2-annulated α-fused quinoxalines using benzotriazole methodology by a modifiedPictet–Spenglerreaction is described. The approach involves the reaction of arylamines 4 with aromatic aldehydes 5 to furnish 6-endo-dig-cyclized products. Dihydroquinoxalines 6 were selectively obtained by using AlCl3 in tetrahydrofuran (THF) at room temperature
Highly selective synthesis of mono- and bis-4,5-dihydropyrrolo[1,2-a]quinoxalines catalyzed by sustainable supported acidic ionic liquid in water media
AbstractPreparation of substituted as well as the selective synthesis of mono- and bis-4,5-dihydropyrrolo[1,2-a]quinoxalines using a highly efficient, sustainable, and reusable supported acidic ionic liquid is reported. The reaction method is ecofriendly and has the advantages of mild conditions, green solvent (H2O), short reaction times, and a reusable acidic catalyst. Graphical abstract
摘要报道了使用高效,可持续和可重复使用的负载型酸性离子液体制备取代的以及选择性合成单和双-4,5-二氢吡咯并[1,2- a ]喹喔啉。该反应方法是环境友好的,并且具有条件温和,绿色溶剂(H 2 O),反应时间短和可重复使用的酸性催化剂的优点。 图形概要
An eco-friendly Pictet–Spengler approach to pyrrolo- and indolo[1,2-a]quinoxalines using p-dodecylbenzenesulfonic acid as an efficient Brønsted acid catalyst
作者:Amreeta Preetam、Mahendra Nath
DOI:10.1039/c4ra16651e
日期:——
facile and environmentally benign Pictet–Spengler strategy for the synthesis of a series of biologically important pyrrolo- and indolo[1,2-a]quinoxalines has been developed by reacting 1-(2-aminophenyl)-pyrrole or 1-(2-aminophenyl)indoles with a wide range of aromatic aldehydes, acetophenones or isatins in ethanol at ambient temperature using p-dodecylbenzenesulfonic acid (p-DBSA) as an efficient Brønsted
Tailored SnO2@MWCNTs efficient and recyclable nano-catalyst for selective synthesis of 4, 5-dihydropyrrolo [1, 2-a] quinoxalines via Pictet–Spengler reaction
作者:Sushil R. Mathapati、Ravindra C. Alange、C. B. Sherin Mol、Sambhaji S. Bhande、Arvind H. Jadhav
DOI:10.1007/s11164-022-04852-0
日期:2022.12
investigated and discussed in detail. The protocol displayed high tolerance to different functionalities with respect to different substituted aromatic aldehydes to form quinoxalinederivatives in efficient way and gave excellent yield. Plausible reaction mechanistic pathway for the selective formation of quinoxaline over SnO2@MWCNTs is also proposed. It is believed that high dispersion of SnO2 over MWCNTs
Hit-to-lead optimization of a novel series of N-alkyl-N-[2-oxo-2-(4-aryl-4H-pyrrolo[1,2-a]quinoxaline-5yl)-ethyl]-carboxylic acid amides, derived from a high throughput screening (HTS) hit, are described. Subsequent optimization led to identification of in vitro potent cannabinoid 1 receptor (CB1R) antagonists representing a new class of compounds in this area. (C) 2009 Elsevier Ltd. All rights reserved.