A. Padwa et al., SYNTHESIS OF POLYHETEROCYCLIC RING COMPOUNDS BY THE INTRAMOLECULAR CYCLOADDITION OF N-ALKENYL SUBSTITUTED DIAZOIMIDES, Tetrahedron letters, 35(39), 1994, pp. 7159-7162
Rhodium(II) catalysis of various diazoimides containing tethered pi-sy
stems attached to the nitrogen atom results in isomunchnone dipole for
mation followed by intramolecular dipolar-cycloaddition.