Ac. Tome et al., STRUCTURAL ELUCIDATION OF 6,7,8,9-TETRASUBSTITUTED CYCLOOCTAPYRIMIDINES BY NUCLEAR-MAGNETIC-RESONANCE SPECTROSCOPY, Journal of chemical research. Synopses, (5), 1996, pp. 250-251
NMR experiments confirm that the novel cycloadduct of dimethyl ethoxy-
2-methyl-5,6,7,8-tetrahydroquinazoline-6,7- dicarboxylate 4 with N-phe
nylmaleimide is hylcyclooctapyrimidine-6,7-(N-phenyldicarboximide) 5.