Synthesis and conversion of 2‐(pyrazol‐1‐yl)quinoxaline 4‐oxides

Abstract The reaction of 6‐chloro‐2‐hydrazinoquinoxaline 4‐oxide 1b with acetylacetone or benzoylacetone gave 6‐chloro‐2‐(3,5‐dimethylpyrazol‐i‐yl)quinoxaline 4‐oxide 5a or 6‐chloro‐2‐(3‐methyl‐5‐phenylpyrazol‐1‐yl)quinoxaline 4‐oxide 5b, respXectively. Compound 5a or 5b was converted into the pyrrolo[1,5‐a]quinoxaline 6a or 6b, triazolo[4,3‐a]quinoxaline 9a or 9b, and tetrazolo[1,5‐a]quinoxaline 10.