Trifluoromethanesulfonic acid → 5-Bromo-2-chloro-4-hydroxybenzonitrile

Temperatur

-30 °C

To a solution of 2-chloro-4-hydroxybenzonitrile (1, 10 g, 65 mmol) in acetonitrile (200 mL) at −30° C. was added dropwise trifluoromethanesulfonic acid (10 mL, 71 mmol). The solution was stirred for 10 min at −30° C., before adding of N-bromosuccinimide (16.2 g, 91 mmol). After 18 h stirring at ambient temperature, the solution was quenched with aqueous saturated sodium hydrogen carbonate. The organic layer was extracted with ethyl acetate two times, washed with brine, dried over magnesium sulfate, filtered and concentrated in vacuo. The resulting crude residue was purified on a Biotage® purification apparatus (silica gel, 5 to 40% ethyl acetate in hexanes gradient) to yield the title compound (13 g, 56 mmol, 86%) as a white solid.

1. stirringAfter 18 h stirring at ambient temperature
2. customthe solution was quenched with aqueous saturated sodium hydrogen carbonate
3. extractionThe organic layer was extracted with ethyl acetate two times
4. washwashed with brine
5. dry with materialdried over magnesium sulfate
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. customThe resulting crude residue was purified on a Biotage® purification apparatus (silica gel, 5 to 40% ethyl acetate in hexanes gradient)

ORD-Eintrag

ord-bdb96887be414759b7e4176e6b8059c1

Quelldatensatz

uspto-grants-2014_12

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08921412B2