Quinoxalines. XXIV. Synthesis of 4‐Substituted 1,2,3‐Triazolo [1, 5‐a] quinoxalines
3‐Substituted quinoxaline‐2‐carbaldehydes 1 react with tosylhydrazide to give 3‐substituted quinoxaline‐2‐carbaldehyde tosylhydrazones 2. The treatment of 2 with a boiling solution of sodium methoxide or ethoxide – the so called Bamford‐Stevens reaction – leads to 4‐substituted 1,2,3‐triazolo[1,5‐a]quinoxalines 4 in high yields. Some of these compounds were also obtained by thermolysis of 2.
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