Journal
DYES AND PIGMENTS
Volume 81, Issue 3, Pages 245-253Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2008.10.018
Keywords
Microwave irradiation; Quinoxalines; Pyridopyrazines; Fluorescent dyes; Fluorescent lifetime; Halochromism; Cinnamils
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A simple and facile method for the synthesis of 2,3-bis[(E)-2-aryl vinyl]-quinoxaline and 2,3-bis[(E)-2aryl vinyl]-pyrido(2.3-b)pyrazine is described. Condensation of cinnamils with 1,2-diaminobenzene and 2.3-diaminopyridine in water using conventional heating and microwave irradiation afforded high yields (71-92%) of 2,3-bis[(E)-2-aryl vinyl]-quinoxalines and 2,3-bis[(E)-2-arylvinyl]-pyrido(2,3-b)pyrazines. The photophysical properties of the resultant quinoxaline and pyrazine derivatives were studied; the pyridopyrazine derivatives were found to exhibit halochromism. (C) 2008 Elsevier Ltd. All rights reserved.
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