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In a 25 mL round bottom was placed o-aminophenol (163 mg, 1.5 mmol) and EtOH (10 mL). The mixture was warmed until homogenous and then compound 4a (250 mg, 741 μmol) was added (see Example 2 for synthesis of 4a). The mixture was stirred vigorously at reflux during which a precipitate formed. After 1 h the mixture was cooled in an ice bath, filtered, and the precipitate washed with cold EtOH to yield 5e (248 mg, 96.4%) as a white powder. 1H NMR (600 MHz,) δ 10.02 (s, 1H), 7.29-7.26 (m, 2H), 7.24-7.17 (m, 4H), 7.10 (dd, J=1.6, 7.8, 1H), 6.96 (s, 1H), 6.90 (dd, J=1.1, 8.2, 1H), 6.77 (td, J=1.2, 7.6, 1H), 3.34 (s, 3H), 3.21 (s, 3H). 13C NMR (151 MHz, DMSO d6) δ 159.11, 152.86, 150.91, 133.81, 130.35, 129.98, 129.67, 129.13, 128.58, 127.83, 127.18, 125.95, 118.99, 116.39, 106.16, 101.88, 31.50, 27.46. MS (ES+) (m/z): [M+1]+ calculated for C20H18N3O3, 348.13. found 348.11.

1. additionwas added
2. temperatureat reflux during which a precipitate
3. customformed
4. temperatureAfter 1 h the mixture was cooled in an ice bath
5. filtrationfiltered
6. washthe precipitate washed with cold EtOH