A convenient method leading to fused pyrido[1,2-a] [1,3,5]triazine-2-ones is described. It consists in a one-pot, two-step reaction of N-(2′-pyridinyl)benzoylacetamide with nitrosobenzenes. On the other hand, N-(2′-pyridinyl)acetoacetamide provides a C-2 condensation/addition product with nitrosobenzene. N-(2′-Pyridinyl)benzoylthioacetamide and N-(2′-pyridinyl)acetothioacetamide with nitrosobenzene undergo oxidative heterocyclisation leading to [1,2,4]thiadiazolo[2,3-a]pyridine derivatives.
描述了一种便捷的方法,可合成融合的
吡啶[1,2-a][1,3,5]三嗪-2-酮。该方法由N-(2′-
吡啶基)苯甲酰乙酰胺与
亚硝基苯的单锅两步反应组成。另一方面,N-(2′-
吡啶基)乙酰乙酰胺与
亚硝基苯反应生成C-2缩合/加成产物。N-(2′-
吡啶基)苯甲
硫代乙酰胺和N-(2′-
吡啶基)乙酰
硫代乙酰胺与
亚硝基苯反应时经历氧化异环化,生成[1,2,4]噻噁二唑[2,3-a]
吡啶衍生物。