8-Ethoxy-2-(4-methoxy-phenyl)-5,6-dihydro-quinazoline → 2-(4-Methoxy-phenyl)-6,7-dihydro-5H-quinazolin-8-one

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Reaction Steps

8-Ethoxy-2-(4-methoxy-phenyl)-5,6-dihydro-quinazoline (860 mg; 3.05 mmol) is dissolved in acetic acid/water (16 ml/1.6 ml) and refluxed for 15 minutes. Evaporation to dryness delivers the title compound as yellow crystals. 1H-NMR (400 MHz; DMSO-d6): 9.04 (s, 1H); 8.34 (d, 2H); 7.10 (d, 2H); 3.86 (s, 3H); 2.99 (t, 2H); 2.79 (t, 2H); 2.15 (m, 2H). MS (m/z) ES+: 255 (MH+).

Provenance & Evidence