An expedient synthesis of 1,2-dihydrobenzo[g]quinoline-5,10-diones via copper(II) triflate-catalyzed intramolecular cyclization of N-propargylaminonaphthoquinones
摘要:
An expedient synthesis of a series of 1,2-dihydrobenzo[g]quinoline-5,10-diones in good yields has been accomplished via three-component one pot sequential reactions of 2-hydroxynaphthalene-1,4-dione, substituted anilines and propargyl as well as 3-ethylpropargyl bromides furnishing N-propargylaminonaphthoquinones, and their concomitant copper(II) triflate-catalyzed intramolecular 6-endo-dig cyclization. (C) 2013 Elsevier Ltd. All rights reserved.
BiCl<sub>3</sub> catalyzed synthesis of 2-amino-1,4-naphthoquinones and 1,4-naphthoquinon-2-sulfides and one-pot sequential amine-arylation of 1,4-naphthoquinone
作者:Mayurakhi Bhuyan、Gakul Baishya
DOI:10.1039/d2ob01792j
日期:——
Using the Lewis acid catalyst BiCl3, a new method for the synthesis of 2-amino-1,4-naphthoquinones and 1,4-naphthoquinon-2-sulfides from 1,4-naphthoquinone has been devised. This method has a broad substrate scope and product extraction is easy. It is low-cost, requires mild and sustainable reaction conditions and results in superior product yields. Additionally, this study presents the first technique
使用路易斯酸催化剂BiCl 3,设计了一种从1,4-萘醌合成2-氨基-1,4-萘醌和1,4-萘醌-2-硫化物的新方法。该方法底物适用范围广,产物提取容易。它成本低廉,需要温和且可持续的反应条件,并可提高产品收率。此外,本研究提出了第一种用胺和芳基肼/K 2 S 2 O 8进行单锅顺序胺芳基化的技术直接从 1,4-萘醌生产芳基化 2-氨基-1,4-萘醌。这种从经历自由基偶联反应的芳基肼产生芳基自由基的操作上直接的通过自由基捕获控制实验得到了很好的证明。
A one-pot access to 2-(N-substituted Amino)-Quinones or 3-indolyl-Quinones from naphthol/hydroquinone
作者:Yu Dong、Yong Chen、Zhan-Yuan Zhang、Jun-Hu Qian、Zhen-Zhen Peng、Bo Chang、Zhi-Chuan Shi、Zhong-Hui Li、Bing He
DOI:10.1016/j.tet.2023.133337
日期:2023.4
naphthol/hydroquinone with amines or indoles, such as various (hetero)aromaticamine and aliphatic amine, has been developed. The reaction proceeds through oxidation of naphthol/hydroquinone with the CuBr2 or (NH4)2S2O8 oxidant. This reaction provides efficient access to the biologically important and synthetically useful 2-amino-quinones and 3-indolyl-quinones with good yields undermildconditions. The present
从萘酚/氢醌与胺或吲哚,如各种(杂)芳胺和脂肪胺,到2-( N-取代氨基)-1,4-醌或 3-吲哚基醌的顺序一锅法已经发达。该反应通过使用CuBr 2或(NH 4 ) 2 S 2 O 8氧化剂氧化萘酚/氢醌来进行。该反应提供了在温和条件下以良好的产率有效地获得生物学上重要且合成有用的 2-氨基醌和 3-吲哚基醌。本协议简单、实用,并显示出良好的功能组耐受性。
<i>tert</i>-Butylhydroperoxide mediated radical cyanoalkylation/cyanoalkenylation of 2-anilino-1,4-naphthoquinones with vinylarenes/arylalkynes and azobis(alkylcarbonitrile)s
three-component radical cascade pathway has been achieved. Here, tert-butylhydroperoxide (TBHP) acts as an efficient oxidant, and it smoothly drives the reaction, producing the three-component products in very good to excellent yields. This cascade reactioneliminates the use of any base, additive, metal and hazardous cyanating agent. Additionally, this protocol exclusively delivers a stereospecific product
Simple and practical strategies for visible-light-induced C–H alkylation of 2-amino-1,4-naphthoquinones with cyclobutanone oxime esters and hydroxamic acid derivatives have been developed under mild and redox-neutral conditions. These two reactions can be carried out at room temperature and obtain a variety of 2-amino-1,4-naphthoquinone derivatives with cyano and amide groups. Moreover, the cyanoalkylation