反应详情

温度

70 °C

To 1-bromo-2,4,6-trifluorobenzene (0.01 ml, 0.12 mmol) in diethyl ether (0.5 mL) at −78° C. was added n-butyllithium (0.13 mL, 0.14 mmol, 1.6 M in hexanes). After 30 tert-butyl 6-(3,5-dimethylisoxazol-4-yl)-2-ethoxy-4-(pyrazine-2-carbonyl)-1H-benzo[d]imidazole-1-carboxylate (36.6 mg, 0.08 mmol) in diethyl ether (1 mL) was added drop-wise to the reaction. After 90 minutes, the reaction was warmed, quenched with saturated NH4Cl(aq) (10 mL), extracted with ethyl acetate (3×10 mL), dried over Na2SO4, and concentrated in vacuo. To the crude residue in ethanol (1.5 mL) was added hydrochloric acid (0.20 mL, 0.79 mmol, 4 M in 1,4-dioxane) and the mixture was heated to 70° C. in a microwave reactor for 45 minutes. Purification by reverse-phase HPLC (35-50% acetonitrile/water with 0.01% trifluoroacetic acid, Gemini C18 5μ) afforded 6-(3,5-dimethylisoxazol-4-yl)-4-(hydroxy(pyrazin-2-yl)(2,4,6-trifluorophenyl)methyl)-1H-benzo[d]imidazol-2(3H)-one as a pale yellow solid.

1. customto the reaction
2. temperaturethe reaction was warmed
3. customquenched with saturated NH4Cl(aq) (10 mL)
4. extractionextracted with ethyl acetate (3×10 mL)
5. dry with materialdried over Na2SO4
6. concentrationconcentrated in vacuo
7. customPurification by reverse-phase HPLC (35-50% acetonitrile/water with 0.01% trifluoroacetic acid, Gemini C18 5μ)