The reaction of 3-hydroxypyridine<i>N</i>-oxide with active hydrogen compounds and the synthesis of 3-substituted 2-aminofuro[3,2-<i>b</i>] pyridines
作者:M. Luisa Stein、Fedele Manna、Carmine C. Lombardi
DOI:10.1002/jhet.5570150833
日期:1978.12
N-oxide reacts readily in acetic anhydride with ethyl cyanoacetate, cyanoacetone and malononitrile. The three reaction products (2-substituted-3-acetoxypyridines) show different equilibria between tautomeric structures; in strong acids they undergo cyclization to 3-substituted 2-aminofuro[3,2-b]pyridines.
3-羟基吡啶N-氧化物在乙酸酐中容易与氰基乙酸乙酯,氰基丙酮和丙二腈反应。三种反应产物(2-取代的-3-乙酰氧基吡啶)在互变异构结构之间显示出不同的平衡。在强酸中,它们经历环化反应生成3-取代的2-氨基呋喃并[3,2- b ]吡啶。