【文章名】An unusual polyheterocyclic diversity by the p-cyclisation of N-carbamoyliminium ion, with or without tandem N,N-acetal cleavage, from spiro(imidazolidinoquinazolinones).
An unusual polyheterocyclic diversity by the p-cyclisation of N-carbamoyliminium ion, with or without tandem N,N-acetal cleavage, from spiro(imidazolidinoquinazolinones).
[摘要]：Spiro(imidazolidinoquinazolinones), obtained easily in one step from 1-carbamoylisatins, are readily converted in three steps by successive N-alkylations and sodium borohydride regioselective redn. into the corresponding hydroxyspirolactams. The latter are valuable platforms for further transformations via the intermediacy of N-acyliminium species and have been applied to the synthesis of original isoquinoloquinazoline, indoloquinazoline, and imidazoindole derivs.
