Novel Rearrangement During the Reaction of Diethylmalonate with <font>α</font>-(5-Substituted 2-hydroxyphenyl)-N-phenyl Nitrones
作者:S. R. Jayapradha、S. Muthusubramanian
DOI:10.1080/00397910902985481
日期:2010.1.14
The hydroxyl group at the ortho position of the -aryl ring of -(2-hydroxyaryl)-N-aryl nitrones altered the expected course of the reaction between differently substituted -(2-hydroxyaryl)-N-aryl nitrones and diethylmalonate, leading to the formation of an enamine involving an interesting rearrangement under microwave irradiation. The enamines have been characterized by NMR and x-ray analyses, and a reasonable mechanism has been put forwarded to explain the rearrangement.
Pd-Catalyzed Redox-Neutral C–N Coupling Reaction of Iminoquinones with Electron-Deficient Alkenes without External Oxidants: Access of Tertiary (<i>E</i>)-Enamines and Application to the Synthesis of Indoles and Quinolin-4-ones
A novel and efficient reductive N-alkenylation of iminoquinones with electron-deficient olefins has been successfully developed by Pd(II)-catalyzed redox-neutral reactions, which provides a synthesis of tertiary (E)-enamines. We further demonstrate that the tertiary enamines can be converted to multifarious N-heterocyclic compounds, indoles, and quinolones in good yields.