Tandem 1,3-dipolar cycloadditions of münchnones. Syntheses andmolecular structures of10-azatetracyclo[6.3.0.04,11.05,9]undecanes andazahomopentaprismane

Photocyclization of 10-benzyl-9,11-diphenyl-10-azatetracyclo[6.3.0.0 4,11 .0 5,9 ]undeca-2,6-diene 11, prepared in one step from munchnone 7 and cycloocta-1,3,5,7-tetraene 10, gives azahomopentaprismane 12.