From Ketenimines to Ketenes to Quinolones: Two Consecutive Pseudopericyclic Events
作者:Mateo Alajarín、María-Mar Ortín、Pilar Sánchez-Andrada、Ángel Vidal、Delia Bautista
DOI:10.1021/ol052189v
日期:2005.11.1
[reaction: see text] N-[2-(Alkyl- or arylthio)carbonyl]phenyl ketenimines undergo cyclization under mild thermal conditions to afford 2-alkyl(aryl)thio-3H-quinolin-4-ones by means of the 1,5-migration of the alkyl(aryl)thio group from the carbonyl carbon to the central carbon atom of the ketenimine fragment followed by the 6pi-electrocyclization of the resulting vinyliminoketene. These 1,5-migration
[反应:参见正文] N- [2-(烷基硫基或芳硫基)羰基]苯基酮亚胺在温和的热条件下进行环化反应,从而通过1生成2-烷基(芳基)硫基-3H-喹啉-4-酮。烷基(芳基)硫基从羰基碳到酮亚胺片段的中心碳原子的5-迁移,然后对所得的乙烯基亚氨基烯酮进行6-π电环化。这些1,5-迁移和电环化过程是通过过渡态发生的,这些过渡态的伪周环特性是根据其磁性能,几何形状和NBO分析建立的。