基于3-(苯并咪唑-2-基)喹喔啉-2(1 H)-与1,2-的环收缩,已开发出一种高效且通用的具有两个苯并咪唑片段的喹喔啉衍生物的合成方法。二氨基苯及其各种类型的取代和稠合衍生物。由于分子间和分子内过程,涉及桥联和相邻碳原子的大多数双-苯并咪唑基喹喔啉信号的几种形式之间的自缔合,质子交换,构象和/或互变异构交换,且NMR光谱中的苯并咪唑片段变宽。苯并咪唑片段与分子的喹喔啉核心之间的共轭作用比喹喔啉衍生物(10c)与其噻二唑[ f ]-(17)和吡咯并[ a ]-(19)环化了衍生物,导致整个分子的平面度更大。
Comparative use of solvent-free KF-A1<sub>2</sub>O<sub>3</sub>and K<sub>2</sub>CO<sub>3</sub>in acetone in the synthesis of quinoxaline 1,4-dioxide derivatives designed as antimalarial drug candidates
paper we describe two new basic conditions for the synthesis of quinoxaline1,4-dioxidederivatives in moderate to good yields. These conditions, exemplified by the use of K2C03 in acetone or KF/A1203 in the absence of an organic solvent, were reproducible and applicable to the synthesis of 2-(carboethoxy)-3-phenylquinoxaline 1,4-dioxidederivatives substituted in position 4 with electron-donating or
在本文中,我们描述了以中等到良好的产率合成喹喔啉1,4-二氧化物衍生物的两个新的基本条件。这些条件下,通过使用的K例举2 C0 3在丙酮或KF / Al 2 0 3在不存在有机溶剂的,是可再现的并且适用于2-(乙氧羰基)-3-苯基喹喔啉的合成1,4-在4位上被给电子或吸电子基团取代的二氧化碳衍生物。
The reactions of benzofuroxan with carbonyl compounds on the surface of solid catalysts
The cyclocondensations of benzofuroxan 1a with carbonylcompounds were smoothly and efficiently carried out by the adsorption of the components on the surface of silica gel or a molecular sieve to form a 2,3-disubstituted quinoxaline 1,4-dioxide. When the reactions using a molecular sieve 3A (powder) were carried out at 90°, the actual reaction times were reduced to 0.5-2 hours. Although Duerckheimer
Reactions of Benzofuroxan with 1,3-Diketones or β-Ketoesters on Silica Gel or Alumina
作者:Minoru Hasegawa、Tohru Takabatake
DOI:10.1055/s-1985-31391
日期:——
The cyclocondensation of benzofuroxan with 1,3-diketones, 3-oxoalkanoic esters, butanedioic esters, or 3-oxoalkanamides in the presence of silica gel (adsorption of the components on silica gel) represents a convenient method for the synthesis of 2,3-disubstituted quinoxaline-1,4-bis-oxides.
New series of 3-phenylquinoxaline 1,4-di-N-oxide with selective activity against Mycobacterium tuberculosis have been prepared and evaluated. Thirty-four of the seventy tested compounds showed an MIC value less than 0.2 mu g/mL, a value on the order of the MIC of rifampicin. Furthermore, 45% of the evaluated derivatives showed a good in vitro activity/toxicity ratio. The most active and selective compounds carry a fluorine atom in the quinoxaline 7-position or in the phenyl substituent para-position. In conclusion, the potency, low cytotoxicity and selectivity of these compounds make them valid lead compounds for synthesizing new analogues, particularly compound 7-methyl-3-(4'-fluoro) phenylquinoxaline-2-carbonitrile 1,4-di-N-oxide (MIC <0.2 mu g/mL and SI > 500). (C) 2008 Elsevier Ltd. All rights reserved.
Takabatake, Tohru; Hasegawa, Minoru, Journal of Heterocyclic Chemistry, 1987, vol. 24, p. 529 - 530