Tandem Processes in<i>C</i>-Aryl Ketenes and Ketenimines Triggered by [1,5]-Hydride-Like Migration of an Acetalic Hydrogen Atom
作者:Angel Vidal、Marta Marin-Luna、Mateo Alajarin
DOI:10.1002/ejoc.201301501
日期:2014.2
3-dioxolan-2-yl)phenyl ketenes that, under thermal conditions, smoothly underwent a [1,5]-H shift/6π-electrocyclic ring-closure sequence to give 1H-2-benzopyrans. The application of such processes to ketenes, produced by replacing the phenyl scaffolding with a thiophene ring, afforded thienopyrans. The aza-Wittig reaction of these 2-(1,3-dioxolan-2-yl)phenyl and thienyl ketenes with N-aryliminophosphoranes