反应详情

温度

80 °C

In a 15 mL reaction tube was added 6-bromo-1-methyl-7-phenyl-1H-pyrido[2,3-b][1,4]oxazin-2(3H)-one (40 mg, 0.125 mmol) and tert-butyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzylcarbamate (50 mg, 0.150 mmol) in 1,4-dioxane (2 ml), followed by a solution of sodium carbonate (40 mg, 0.3 mmol) in water (0.5 ml) to give a white suspension. This was degassed by bubbling nitrogen for 10 minutes, followed by the addition of [1,1-bis(diphenylphosphino)ferrocene]dichloropalladium(II)dichloromethane adduct (9 mg, 0.013 mmol). The reaction mixture was heated to 80° C. overnight. The reaction mixture was allowed to cool to room temperature, diluted with brine (4 ml) and extracted into ethyl acetate (3×4 ml). The combined organic phases were dried over Na2SO4, filtered and concentrated to dryness under reduced pressure. The residue was purified by Biotage chromatography (cyclohexane:ethyl acetate, gradient elution from 90:10 to 20:80) to give the desired product as a white solid (40 mg, 72% yield). 1H-NMR (500 MHz, CDCl3) δ 7.27-7.32 (5H, m), 7.25 (1H, s), 7.16-7.20 (2H, m), 7.10 (2H, d), 4.89 (2H, s), 4.81 (1H, br s), 4.26 (2H, br s), 3.39 (3H, s), 1.23 (9H, br s). LCMS (Method D): RT=1.40 min, M+H+=446.20.

1. customIn a 15 mL reaction tube
2. customto give a white suspension
3. customThis was degassed
4. customby bubbling nitrogen for 10 minutes
5. temperatureto cool to room temperature
6. extractionextracted into ethyl acetate (3×4 ml)
7. dry with materialThe combined organic phases were dried over Na2SO4
8. filtrationfiltered
9. concentrationconcentrated to dryness under reduced pressure
10. customThe residue was purified by Biotage chromatography (cyclohexane:ethyl acetate, gradient elution from 90:10 to 20:80)