反应详情

温度

125 °C

To stirred mixture of 5-iodo-1-(1-(3-methoxy-4-((6-methoxypyridin-3-yl)methoxy)phenyl)ethyl)-1H-benzo[d]imidazol-2-amine (0.267 g, 0.50 mmol), 1-methyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (0.138 g, 0.63 mmol), tricyclohexylphosphine (0.014 g, 0.050 mmol), potassium phosphate tribasic (0.381 g, 1.76 mmol) in 1,4-dioxane (3 mL) and water (1 mL) was added palladium(II) acetate (0.005 g, 0.025 mmol). The mixture was heated to 125° C. in a microwave reactor. After 30 min, additional portions of catalyst (0.005 g) and ligand (0.014 g) were added, and the mixture was reheated in a microwave reactor to 150° C. After 60 min of reaction time, the crude mixture was transferred to a 20 mL microwave reaction vial and was treated with an additional portions of boronate ester (0.050 g), catalyst (0.005 g), and ligand (0.014 g). The mixture was diluted with additional 1,4-dioxane (8 mL) and water (4 mL). The mixture was heated to 150° C. in a microwave reactor. After a total of 105 min, the reaction was complete. The mixture was diluted with water (30 mL) and extracted with dichloromethane (3×25 mL). The combined organic phases were dried over magnesium sulfate, filtered, and concentrated to provide 419 mgs of a brown oil. Chromatographic purification (CombiFlash, 12 g SiO2 gold column, 1-5% 2M ammonia in methanol/dichloromethane elute) provided 109 mgs of an impure tan solid. A second chromatographic purification (CombiFlash, 12 g SiO2 gold column, 1-5% 2M ammonia in methanol/dichloromethane elute) afforded 0.063 g (26%) of the product as a yellow solid: 1H NMR (400 MHz, CDCl3) δ 8.22-8.16 (m, 1H), 7.75 (d, J=0.8 Hz, 1H), 7.68 (dd, J=8.5, 2.4 Hz, 1H), 7.58 (d, J=0.8 Hz, 1H), 7.53 (d, J=1.5 Hz, 1H), 7.20-7.16 (m, 1H), 7.11-7.06 (m, 1H), 6.96-6.87 (m, 2H), 6.80-6.73 (m, 2H), 5.55 (q, J=7.1 Hz, 1H), 5.05 (s, 2H), 4.33 (br s, 2H), 3.95 (s, 3H), 3.94 (s, 3H), 3.76 (s, 3H), 1.87 (d, J=7.1 Hz, 3H) ppm; (M+1)=485.

1. customthe mixture was reheated in a microwave reactor to 150° C
2. customAfter 60 min of reaction time
3. temperatureThe mixture was heated to 150° C. in a microwave reactor
4. customAfter a total of 105 min
5. extractionextracted with dichloromethane (3×25 mL)
6. dry with materialThe combined organic phases were dried over magnesium sulfate
7. filtrationfiltered
8. concentrationconcentrated