Multicomponent Reactions of Phosphines, Enynedioates and Cinnamaldimines Give γ-Lactams with a 1,3,5-Hexatriene Moiety for Facile 6π Electrocyclization: Access to Oxindoles, Isatins and Isoxazolinones
作者:Jie-Cheng Deng、Wu-Yin Chen、Chaoyuan Zhu、Shih-Ching Chuang
DOI:10.1002/adsc.201401134
日期:2015.5.4
Multicomponent reactions of phosphines, enynedioates and cinnamaldimines generated 3‐phosphorus ylide γ‐lactams having a 1,3,5‐hexatriene moiety with low activation energy barrier for 6π electrocyclization, through initial formation of 1,3‐dipoles from the α(δ′)‐Michael addition of phosphines to enynedioates. The reactive 1,3‐dipoles underwent addition to cinnamaldimines, lactamization, 6π electrocyclization
膦,炔基和肉桂二胺的多组分反应通过初始由α(δ')形成1,3-偶极子而生成具有1,3,5-己三烯基团且活化能垒低的6-π内酰胺的3-磷内酯γ-内酰胺。 )-将膦加成膦酸酯。反应性1,3偶极子经过肉桂醛,内酰胺化,6π电环化和氧化处理,生成3磷的叶立德氧吲哚作为平台分子,向着isatins和isoxazolinones迁移。通过动力学和计算研究进一步检验了关键步骤6π电环化。