One-Pot Synthesis of 3,4-Dihydro-2<i>H</i>-pyrido[1,2-<i>a</i>][1,3,5]triazin-2-one Derivatives from<i>N</i>-(2′-Pyridinyl)benzoylacetamide and Nitrosobenzenes
作者:Barbara Zaleska、Bartosz Trzewik、Ewa Stodolak、Jacek Grochowski、Pawe Serda
DOI:10.1055/s-2004-834892
日期:——
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。