Preparation of Imino Lactones by Electrophilic Cyclization of β,γ-Unsaturated Hydroxamates: Formation of 3-Cyanoprop-2-en-1-ones through Fragmentation Reactions
作者:Houssam Trabulsi、Régis Guillot、Gérard Rousseau
DOI:10.1002/ejoc.201000376
日期:2010.10
Treatment of γ-disubstituted β,γ-unsaturated hydroxamates with bis(collidine)bromine(I) hexafluorophosphate led mainly to the formation of cyclic bromo imidates - the thermodynamic products. Unsaturated cyclic imidates were then obtained by treatment with triethylamine. With γ-aryl β,γ-unsaturated hydroxamates, the corresponding cyclic bromo imidates were also obtained. On treatment with triethylamine
用双(可力丁)溴(I)六氟磷酸酯处理 γ-二取代的 β,γ-不饱和异羟肟酸酯主要导致环状溴亚胺酸酯(热力学产物)的形成。然后通过用三乙胺处理获得不饱和环状亚胺酸酯。用γ-芳基β,γ-不饱和异羟肟酸酯,也得到了相应的环状溴亚胺酸酯。然而,在用三乙胺处理时,这些化合物通过裂解反应以良好的产率形成 3-cyanoprop-2-en-1-ones。