Fluorescent solvatochromism of bi-polar ,-diphenylaminoaryl-substituted hexaazatriphenylenes, tetraazaphenanthrene, and quinoxalines

Room temperature facile synthesis of quinoxalines catalyzed by amidosulfonic acid

“…Several synthetic routes to quinoxaline have been developed [11] and the well established preparation method is the direct condensation [12] of o-phenylenediamines with -diketones in refluxing ethanol [13] or in boiling acetic acid [14]. Most recently, several preparative methods through direct condensations to quinoxalines have been reported which using Yb(OTf) 3 [15], molecular iodine [16], or Ce(NH 4 ) 2 (NO 3 ) 6 [17] as catalysts. Indirect alternative routes through tandem oxidation-condensation [18] are useful diversity oriented approaches.…”

“…In aromatic multi-nuclear N-containing heterocyclic compounds, quinoxaline derivatives exhibit special and wide range of functions in biological active compounds [1], electroluminescent materials [2], dyes [3], and anion sensors [4]. Their extraordinary potentials in pharmacological research and practice have attracted much attention.…”

A novel fluorescent bisazomethine dye derived from 3-hydroxyquinoxaline-2-carboxaldehyde and 2,3-diaminomaleonitrile

“…They find applications as dyes [1][2][3], as fluorescent materials [4][5][6] and as organic light emitting devices [7][8][9][10][11][12][13]. Quinoxaline derivatives exhibit a broad spectrum of biological activities [14,15] and find place in the chemical libraries for DNA binding [16,17].…”

Transition-Metal-Free Synthesis of Quinoxalines from o-Phenylenediamines and Arylacetaldehydes under Basic Conditions

“…4 Furthermore, they can serve as precursors for a variety of pharmacological active compounds. 5 Consequently, various synthetic strategies 6 were developed for the preparation of substituted quinoxalines, and the most common methods relied on the direct condensation o-phenylenediamines with α-dicarbonyls.…”