Chou TC, Liao KC, Lin JJ. Synthesis and luminescence properties of U-shaped polycyclic molecules containing syn-facial functionalized quinoxaline rings.
Org Lett 2006;
7:4843-6. [PMID:
16235903 DOI:
10.1021/ol051707z]
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Abstract
[reaction: see text] Rigid U-shaped molecules containing syn-facially situated quinoxaline rings have been synthesized in three steps, by a combination of the Diels-Alder reaction, the ruthenium-catalyzed oxidation, and the Zn(OAc)(2)-catalyzed condensation of the resulting bis-alpha-diketones with benzene-1,2-diamines. The unsymmetric bis-quinoxalines, with electronically different substituents, and the quinoxaline ring-attached alpha-diketones were also prepared. Their luminescence properties were examined and described.
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