An Unusual Polyheterocyclic Diversity by the π-Cyclisation of N-Carbamoyliminium Ion, with or without Tandem N,N-Acetal Cleavage, from Spiro(imidazolidinoquinazolinones)
An Unusual Polyheterocyclic Diversity by the π-Cyclisation of N-Carbamoyliminium Ion, with or without Tandem N,N-Acetal Cleavage, from Spiro(imidazolidinoquinazolinones)