反应详情

温度

95 °C

Into a mixture of 1-[4-(difluoromethoxy)phenyl]-2-phenylethane-1,2-dione (3.7 g, 13.4 mmol), dioxane (180 mL) and EtOH (240 mL) were added 1-methylguanidine hydrochloride (6.6 g, 60.3 mmol), and a solution of Na2CO3 (6.4 g, 60.3 mmol) in H2O (20 mL). The new mixture was stirred at 95° C. for 3 hours. Then, the volatiles were removed under vacuum and the residue was taken in water and extracted with EtOAc. The organic extracts were dried over MgSO4. Evaporation and purification on silica gel (ISCO) using MeOH/EtOAc (1/20) as the eluting solvent gave 2-amino-5-[4-(difluoromethoxy)phenyl]-3-methyl-5-phenyl-3,5-dihydro-4H-imidazol-4-one as a white solid (3.65 g, 94% yield). MS m/e (M+H)+ 332; 1H NMR (400 MHz, DMSO-d6) δ 2.93 (s, 3H), 6.61 (brs, 2H), 7.1 (d, J=8.54 Hz, 2H), 7.15-7.31 (m, 4H), 7.38 (m, 2H), 7.42 (d, J=8.54 Hz, 2H).

1. customThen, the volatiles were removed under vacuum
2. extractionextracted with EtOAc
3. dry with materialThe organic extracts were dried over MgSO4
4. customEvaporation and purification on silica gel (ISCO)