A selective synthesis of novel isoxazolo[2, 3-a]-quinoxalines and pyrrolo[1, 2-a]quinoxalines

The isoxazolo2, 3-a]quinoxalines 11a, b and pyrrolo1, 2-a]quinoxalines 12a, b were selectively synthesized from the 2-substituted 6-chloroquinoxaline 4-oxides 10a, b . The pyrrolo1, 2-a]quinoxalines 12a, b were clarified to be produced by the ring transformation of the isoxazolo2, 3-a]quinoxalines 11a, b .