Generation of 5,6-dimethylene-2(1H)-pyridinones from [3,4-b] sulfolene pyridinones and application in Diels-Alder reactions
2(1H)-Pyrazinones were converted into various [3,4-b] sulfolene pyridinones 19-21, serving as precursors for thermolytic conversion into the corresponding 5,6-dimethylene 2(1H)-pyridinone ortho-quinodimethanes. These were trapped in situ by reaction with
Govaerts, Tom C.,Vogels, Ilse A.,Compernolle, Frans,Hoornaert, Georges J.