A Novel Ring Closure to Furo[2,3-b]quinoxaline [1, 2]
2014
Amer, Adel | Ventura, Montserrat | Zimmer, Hans
An efficient method for the synthesis of furo[2,3-b]quinoxalines has been devised. Thus, 3-halo-2-arylfuro[2,3-b]quinoxalines, 5a-5c were synthesized by the action of cone. H₂SO₄ on 3-(1-halo-2-oxo-2-arylethyl)-2(1H)quinoxalinones, 3b, 3c and 3f respectively. When 3-(1-halo-2-oxo-2-substitutedethyl)-2(1H)quinoxalinones 3d and 3e (substituent = t-butyl, ethoxy) were utilized in this reaction 3-halomethylene-2(1H)quinoxalinone 6a and 6b were obtained in high yield.
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