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organic compounds
The structure of the title compound, C26H31N1O3, was determined by X-ray crystallography. It was found to be a unique, bridged tricyclic nitroso acetal. Notable features include a chair conformation of the tetrahydro-1,2-oxazine ring and a highly pyramidalized N atom [Σangles = 314.2 (6)°]. The configurations of the five contiguous stereogenic centers in the nitroso acetal establish that the tandem cycloaddition sequence proceeded by an exo-[4 + 2]/endo-[3 + 2] pathway.