Abstract
Spiro(imidazolidinoquinazolinones), obtained easily in one step from 1-carbamoylisatins,
are readily converted in three steps by successive N-alkylations and sodium borohydride
regioselective reduction 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 derivatives.
Key words
π-cyclisation - cleavage -
N -acyliminium ion - hydroxy lactam - reduction - imidazolidine - quinazolinone
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Full crystallographic data have been deposited at the Cambridge Crystallographic Data
Centre; CCDC reference number 637457 for product 10b . Copies of the data can be obtained free of charge at the following address: http://www.ccdc.cam.ac.uk.