反应详情

温度

80 °C

(4R,5R)-3-[3,5-bis(trifluoromethyl)benzyl]-5-[5′-bromo-2′-methoxy-4-(trifluoromethyl)biphenyl-2-yl]-4-methyl-1,3-oxazolidin-2-one (358 mg, 0.545 mmol), [2-amino-4-(methoxycarbonyl)phenyl]boronic acid (214 mg, 1.1 mmol), dichloro bis(triphenylphosphine)palladium(II) (76.5 mg, 0.109 mmol), aqueous potassium carbonate (545 μL, 2M, 1.09 mmol) and ethanol (5 mL) were mixed and heated in a 80° C. oil bath. Aliquot at reaction time 2 hours and 3.5 hours indicated about 6% of unreacted starting material. Added more [2-amino-4-(methoxycarbonyl)phenyl]boronic acid (50 mg, 0.256 mmol) when reaction time was 3 hours 45 minutes. Aliquot did not show any further progress. Crude mixture was cooled and mixed with brine. Volatiles were removed from the crude under reduced pressure. The resulting mixture was treated with water followed by ethyl acetate extraction. The combined extracts were dried over Na2SO4, filtrated and concentrated under reduced pressure to afford a dark oil. The resulting oil was purified by flash chromatography (SiO2, Biotage 40+M cartridge, EtOAc/hexanes, gradient) followed by preparative TLC purification (SiO2, 10% ethyl acetate in dichloromethane) to afford methyl 2-amino-2″-{(4R,5R)-3-[3,5-bis(trifluoromethyl)benzyl]-4-methyl-2-oxo-1,3-oxazolidin-5-yl}-4′-methoxy-4″-(trifluoromethyl)-1,1′:3′,1″-terphenyl-4-carboxylate. LCMS calc.=726.18; found=727.29 (M+1)+.

1. customAliquot at reaction time 2 hours and 3.5 hours
2. additionAdded more
3. temperatureCrude mixture was cooled
4. customVolatiles were removed from the crude under reduced pressure
5. additionThe resulting mixture was treated with water
6. extractionfollowed by ethyl acetate extraction
7. dry with materialThe combined extracts were dried over Na2SO4
8. filtrationfiltrated
9. concentrationconcentrated under reduced pressure
10. customto afford a dark oil
11. customThe resulting oil was purified by flash chromatography (SiO2, Biotage 40+M cartridge, EtOAc/hexanes, gradient)
12. customfollowed by preparative TLC purification (SiO2, 10% ethyl acetate in dichloromethane)