Dihydro
[formula: see text] Treatment of o-propargylaryl nitrones with base provided 1,2-dihydro[c]benzazepin-3-ones in good yields. The straightforward transformation is explained on the basis of a multistep rearrangement involving conjugated allene-nitrones as precursors of a 1,7-dipolar electrocyclization process that is followed by further bond reorganizations.
Knobloch
K
Institute of Organic Chemistry and Biochemistry, University of Freiburg, Germany.
Eberbach
W