Pyridine → HCID 136038011, compound

Participants

Reaction Steps

To a mixture of 2-amino-4,6-dimethoxybenzamide (0.0990 g, 0.555 mmol) and pyridine (44.9 μL, 0.555 mmol) in THF (2.02 mL) was added dropwise a solution of the acid chloride (crude residue described above) in THF (925 μL). After 16 h, the mixture was diluted with EtOAc (300 mL), washed with saturated aqueous NH4Cl (3×75 mL), saturated aqueous NaHCO3 (3×75 mL), and brine (75 mL). The insoluble yellow solid was isolated by filtration to provide the amide (0.150 g, 83%). A mixture of the amide (0.148 g, 0.413 mmol) and 2 M NaOH (7.00 mL) was heated at 85° C. for 19 h, cooled to 5° C., and neutralized with 4 M HCl in dioxanes. The white solid was filtered and rinsed with acetone to provide 5,7-dimethoxy-2-(4-methoxy-3,5-dimethylphenyl)quinazolin-4(3H)-one (0.144 g, 100%). Selected data: 1H NMR (300 MHz, CDCl3) δ 11.00 (s, 1H), 7.90 (s, 2H), 6.74 (d, J=2.33 Hz, 1H), 6.51 (d, J=2.32 Hz, 1H), 3.88 (s, 3H), 3.86 (s, 3H), 3.72 (s, 3H), 2.29 (s, 6H); MS (APCI) m/z 341 [M+H]+.

Provenance & Evidence