Diazaindenes (azaindoles). Part 7. Formation of imidazo[1,2-a]pyridinium-8-carboxylate in an attempt to prepare pyrrolo[2,3-b]pyridin-3-one
作者:John Parrick、Russell Wilcox、Anthony H. Kelly
DOI:10.1039/p19800000132
日期:——
Attempts to obtain N-(3-carboxy-2-pyridyl)glycine (5) from 2-chloro-3-cyanopyridine are described. The ring–chain tautomerism of certain N-(2-pyridyl)aminoacetaldehydes is discussed. Three preparations of N-3-(carboxy-2-pyridyl)aminoacetaldehyde (20) and its cyclisation to the zwitterionic imidazo[1,2-a]pyridinium-8-carboxylate (23) are given.
描述了从2-氯-3-氰基吡啶获得N-(3-羧基-2-吡啶基)甘氨酸(5)的尝试。讨论了某些N-(2-吡啶基)氨基乙醛的环链互变异构现象。给出了N -3-(羧基-2-吡啶基)氨基乙醛(20)的三种制备方法及其环化成两性离子咪唑并[1,2 - a ]吡啶鎓-8-羧酸盐(23)的方法。