Oxidation of the title N-aminoquinazolone (2) with lead tetra-acetate in methanol gave the bridged structure (4) which, when left in methanol, was converted into (5) whose cyclopentane ring-containing structure was confirmed by X-ray crystallography.
R. S. Atkinson, N. A. Gawad, D. R. Russell and L. J. S. Sherry, J. Chem. Soc., Chem. Commun., 1983, 568 DOI: 10.1039/C39830000568
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