Reaction of 4-Hydroxyspiro[pyrrole-2,3′-pyrrole] and 4′-Hydroxyspiro[imidazole-5,2′-pyrrole] Derivatives with Dicyclohexylcarbodiimide

The reaction of substituted 4-hydroxyspiro[pyrrole-2,3′-pyrrole] and 4′-hydroxyspiro[imidazole-5,2′-pyrrole] with dicyclohexylcarbodiimide leads to the corresponding derivatives of 4-ureidospiro[pyrrole-2,3′-pyrrole] and 4′-ureidospiro[imidazole-5,2′-pyrrole]. The thermal decomposition of the obtained ureidospirobisheterocycles proceeds nonselectively.