Cyclization of N-alkylazinium cations with bifunctional nucleophiles. 25. Oxidation of tetrahydroquinoxalines condensed with six-membered ring heterocycles

Reaction of six-membered ring heterocycle-annulated tetrahydroquinoxalines with potassium permanganate in acetone results in the formation of oxidation products containing a common system of conjugated double bonds.For Communication 24, see Ref. 1].Translated from Khimiya Geterotsklicheskikh Soedinenii, No. 9, pp. 1260–1263, September, 1987.