Hydrochloric Acid → (4-Bromo-2-chlorophenyl)methanol

Methyl 4-bromo-2-chlorobenzoate (477 g) of Reference Example 11 was dissolved in a mixed solution of ethanol (3000 mL) and water (680 mL), calcium chloride (212.2 g) was added at 10° C., and the mixture was stirred for 30 min. To the solution was added sodium borohydride (144.7 g) by portions so that the inside temperature would not exceed 25° C., and the mixture was stirred at room temperature for 5 hr. 1M Hydrochloric acid (5100 mL) was added dropwise to the reaction mixture, and the reaction solvent was evaporated under reduced pressure. Water and ethyl acetate were added to the residue. After partitioning and extraction, the organic layer was washed with 25% brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure to give the title compound (399 g) as white crystals.

1. additionwas added at 10° C.
2. customexceed 25° C.
3. stirringthe mixture was stirred at room temperature for 5 hr
4. customthe reaction solvent was evaporated under reduced pressure
5. additionWater and ethyl acetate were added to the residue
6. customAfter partitioning
7. extractionextraction
8. washthe organic layer was washed with 25% brine
9. dry with materialdried over anhydrous magnesium sulfate
10. customThe solvent was evaporated under reduced pressure

ORD record

ord-9f525dff5cdf48a9a8e8c98af1d7108b

Source dataset

uspto-grants-2012_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08114902B2