Isocyanate acting as a carbonyl precursor: pyridyl group-assisted formation of 4H-pyrido[1,2-a]pyrimidin-4-ones from ketimines and isocyanates
作者:Yoichiro Kuninobu、Shuhei Nishimura、Kazuhiko Takai
DOI:10.1039/b516916j
日期:——
on a nitrogen atom of the imine moiety with tosylisocyanate, 4H-pyrido[1,2-a]pyrimidin-4-one derivatives could be obtained in quantitative yields. In these reactions, tosylisocyanate acts as a carbonyl precursor. The pyridyl or picolyl group is a key functional group because it is not only the constituent structure of the 4H-pyrido[1,2-a]pyrimidin-4-one framework but also the promoter of the formation
通过在亚胺部分的氮原子上带有吡啶基或甲基吡啶基的酮亚胺与甲苯磺酰基异氰酸酯的反应,可以定量获得4H-吡啶并[1,2-a]嘧啶-4-酮衍生物。在这些反应中,甲苯磺酰基异氰酸酯充当羰基前体。吡啶基或吡啶基基团是关键的官能团,因为它不仅是4H-吡啶并[1,2-a]嘧啶-4-酮骨架的构成结构,而且是烯酮中间体形成的促进剂。