Configurational and conformational analysis of norbornane‐and norbornene‐fused 4,1‐oxazepinones

Abstract The preferred conformations and, for the 3‐methyl‐substituted analogues also the configurations of the C‐3 atom, for 3‐unsubstituted and 3‐methyl‐substituted di‐exo‐ and di‐endo‐annellated oxazepinone derivatives fused with a norbornane or norbornene skeleton were determined by 1H and 13C NMR spectroscopy, including the use of DNOE measurements.