Malononitrile-activated synthesis and anti-cholinesterase activity of styrylquinoxalin-2(1<i>H</i>)-ones
作者:Sheena Mahajan、Nancy Slathia、Vijay K. Nuthakki、Sandip B. Bharate、Kamal K. Kapoor
DOI:10.1039/d0ra02816a
日期:——
Herein, we report a base-free malononitrile activated condensation of 3-methylquinoxaline-2(1H)-one (3MQ) 1 with aryl aldehydes 3a–3ad for synthesis of styrylquinoxalin-2(1H)-ones (SQs) 4a–4ad with excellent yields. In this reaction, malononitrile activates the aldehyde via Knoevenagel condensation towards reaction with 3MQ 1 and gets liberated during the course of reaction to yield the desired SQs
An efficient synthesis of 4-phenoxy-quinazoline, 2-phenoxy-quinoxaline, and 2-phenoxy-pyridine derivatives using aryne chemistry
作者:Mahesh K. Zilla、Sheena Mahajan、Rajni Khajuria、Vivek K. Gupta、Kamal K. Kapoor、Asif Ali
DOI:10.1039/d0ra09994e
日期:——
Herein we report the mild and efficient synthesis of 4-phenoxyquinazoline, 2-phenoxyquinoxaline, and 2-phenoxypyridine derivatives from the starting materials viz. quinazolin-4(3H)-one, quinoxalin-2(1H)-one, and pyridin-2(1H)-one and aryne generated in situ from 2-(trimethylsilyl)phenyl trifluoromethanesulfonate and cesium fluoride. This synthetic methodology gives a new environmentally benign way
在这里,我们报告了从起始材料即4-苯氧基喹唑啉、2-苯氧基喹喔啉和 2-苯氧基吡啶衍生物的温和有效合成。quinazolin-4(3 H )-one、quinoxalin-2(1 H )-one、pyridin-2(1 H )-one 和芳烃由 2-(三甲基甲硅烷基)苯基三氟甲磺酸盐和氟化铯原位生成。该合成方法为制备几种非天然系列的 4-苯氧基喹唑啉、2-苯氧基喹喔啉和 2-苯氧基吡啶化合物提供了一种新的环保方法,其收率高,底物范围广。
Experimental and theoretical studies for mild steel corrosion inhibition in 1.0M HCl by three new quinoxalinone derivatives
Three quinoxalinone derivatives, namely (E)-3-styrylquinoxalin-2(1H)-one (SQ), (E)-3-(4-methoxystyryl)quinoxalin-2(1H)-one (MOSQ) and (E)-3-(4-methoxystyryl)-7-methylquinoxalin-2(1H)-one (MOSMQ) were synthesized and characterized. Thus, their inhibition effects on mild steel corrosion in 1.0 M HCl medium were investigated using weight loss method, electrochemical measurements. The effect of temperature
FeCl<sub>3</sub> as an efficient catalyst for the synthesis of styrylquinoxalin-2(1<i>H</i>)-ones
作者:Rajneesh Paul Sharma、Sheena Mahajan、Nancy Slathia、Kamal K. Kapoor
DOI:10.1080/00397911.2022.2070435
日期:2022.4.3
Abstract The synthesis of (E)-3-substituted styrylquinoxalin-2(1H)-ones was achieved by the reaction of 3-methylquinoxalinone and aromatic aldehydes using FeCl3 as a catalyst in toluene under microwave irradiation. The protocol is endowed with milder reaction conditions, high yields of product, and easy workup procedures.
摘要 (E) -3-取代的styrylquinoxalin-2(1 H )-ones的合成是通过3-甲基喹喔啉酮和芳香醛在甲苯中以FeCl 3为催化剂在微波辐射下反应实现的。该方案具有反应条件温和、产物收率高、后处理简单等特点。
Bromine-Promoted One-Pot Furo[<i>b</i>]annulation and α-C(sp<sup>2</sup>)-Thiomethylation Cascade of (<i>E</i>)-3-Styrylquinoxalin-2(1<i>H</i>)-ones with Dimethyl Sulfoxide
作者:Vakhid A. Mamedov、Nataliya E. Algaeva、Victor V. Syakaev、Liliya V. Mustakimova、Elena A. Khafizova、Leisan R. Shamsutdinova、Ildar’ Kh. Rizvanov、Aidar T. Gubaidullin
DOI:10.1021/acs.joc.2c01158
日期:2022.9.16
(sp2)C bond functionalization of (E)-3-styrylquinoxalin-2(1H)-ones and furo[b]annulation via the 5-exo-cyclization in dimethyl sulfoxide (DMSO). The reaction represents a novel strategy for the synthesis of 2-aryl-3-(methylthio)furo[2,3-b]quinoxalines and involves 3-(1,2-dibromo-2-arylethyl)quinoxalin-2(1H)-ones and 2-arylfuro[2,3-b]quinoxalines as key intermediates. Furthermore, DMSO was converted to
已经开发了一种新工艺,用于溴促进的顺序 (sp 2 )C = (sp 2 )C 键官能化 ( E )-3-styrylquinoxalin-2(1 H )-ones 和通过 5 进行的呋喃 [ b ] 环化-在二甲亚砜 (DMSO) 中外环化。该反应代表了一种合成 2-aryl-3-(methylthio)furo[2,3- b ]quinoxalines 的新策略,涉及 3-(1,2-dibromo-2-arylethyl)quinoxalin-2(1 H ) -ones 和 2-芳基呋喃[2,3- b]喹喔啉作为关键中间体。此外,DMSO 原位转化为二甲基硫醚,作为反应中的甲硫基化试剂。该协议构成了一种有效且方便的方法,用于 ( E )-3-styrylquinoxalin-2(1 H )-在室温下以高产率对具有多种官能团的化合物进行环化和甲基硫醇化。