Reacción #1591630

Ecuación de reacción

triethylamine

1,3-dichloro-5,5-dimethylimidazolidine-2,4-dione

6-(benzylthio)-1-(4-bromo-5-fluoro-2-methylphenyl)quinolin-2(1H)-one

water

2,3,4,5,6-pentafluorophenol

→

perfluorophenyl 1-(4-bromo-5-fluoro-2-methylphenyl)-2-oxo-1,2-dihydroquinoline-6-sulfonate

Rendimiento 85.0%

Disolventes

acetic acid

acetonitrile

Condiciones de reacción

Tratamiento posterior

1. 1
   TemperaturaThe reaction was maintained at 0° C. for 40 min
2. 2
   TemperaturaAfter maintaining at 0° C. for 30 min
3. 3
   Temperaturathe whole was warmed to rt
4. 4
   OtroThe reaction was quenched with water (15 mL)
5. 5
   ExtracciónThe whole was extracted with EtOAc (2×25-mL)
6. 6
   SecadoThe organic layer was dried over MgSO4
7. 7
   Filtraciónfiltered
8. 8
   Concentraciónconcentrated
9. 9
   Otroto afford yellow residue
10. 10
    OtroThe crude material was absorbed onto a plug of silica gel
11. 11
    Otropurified by chromatography through a Redi-Sep pre-packed silica gel column (40 g)
12. 12
    Lavadoeluting with a gradient of 0% to 30% EtOAc in heptane

Procedimiento

A RBF was charged with 6-(benzylthio)-1-(4-bromo-5-fluoro-2-methylphenyl)quinolin-2(1H)-one (2.45 g, 5.39 mmol), acetonitrile (16.91 ml), acetic acid (0.643 ml), and water (0.423 ml). After cooling to 0° C., 1,3-dichloro-5,5-dimethylimidazolidine-2,4-dione (1.594 g, 8.09 mmol) was added as a solid in a single portion. The reaction was maintained at 0° C. for 40 min. At 0° C., 2,3,4,5,6-pentafluorophenol (1.191 g, 6.47 mmol) was added followed by triethylamine (3.01 ml, 21.57 mmol) dropwise. After maintaining at 0° C. for 30 min, the whole was warmed to rt and stir for 20 min. The reaction was quenched with water (15 mL). The whole was extracted with EtOAc (2×25-mL), then with DCM (2×20 mL). The organic layer was dried over MgSO4, filtered, and concentrated to afford yellow residue. The crude material was absorbed onto a plug of silica gel and purified by chromatography through a Redi-Sep pre-packed silica gel column (40 g), eluting with a gradient of 0% to 30% EtOAc in heptane, to provide perfluorophenyl 1-(4-bromo-5-fluoro-2-methylphenyl)-2-oxo-1,2-dihydroquinoline-6-sulfonate (2.65 g, 85% yield) as off-white solid. m/z (ESI) [M+H]+=578.1. NMR (400 MHz, CHLOROFORM-d) δ ppm 1.99 (s, 3 H) 6.80 (d, J=9.02 Hz, 1 H) 6.94 (d, J=9.64 Hz, 1H) 7.04 (d, J=7.98 Hz, 1 H) 7.71 (dd, J=7.15, 0.52 Hz, 1 H) 7.86-7.95 (m, 2 H) 8.29 (d, J=2.18 Hz, 1 H).

Fuente