Sodium Thiosulfate → 2-Bromo-3-chlorobenzaldehyde

A solution of (2-bromo-3-chloro phenyl)methanol (4.73 g, 21.24 mmol), which had been obtained in Reference example 7 (7a), in methylene chloride (120 mL) was added with 1,1,1-tris(acetoxy)-1,1-dihydro-1,2-benziodoxol-3-(1H)-one (10.8 g, 25.49 mmol) under ice cooling, and stirred at room temperature for 2 hours. The reaction solution was added with a mixture of saturated aqueous sodium hydrogen carbonate solution (60 mL) and saturated aqueous sodium thiosulfate solution (30 mL), and then stirred at room temperature for 0.5 hours. The mixture obtained was extracted with dichloromethane (90 mL×2). After that, the organic layers were combined and dried over anhydrous sodium sulfate. The solvent was distilled off under reduced pressure. The residue was purified by silica gel chromatography (n-hexane/ethyl acetate=5/1) to give the title compound as a white solid (4.36 g, yield 94%).

1. stirringstirred at room temperature for 0.5 hours
2. customThe mixture obtained
3. extractionwas extracted with dichloromethane (90 mL×2)
4. dry with materialdried over anhydrous sodium sulfate
5. distillationThe solvent was distilled off under reduced pressure
6. customThe residue was purified by silica gel chromatography (n-hexane/ethyl acetate=5/1)

ORD record

ord-68bf3a7e0ff641cab09c38b7faf73b9d

Source dataset

uspto-grants-2012_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08173631B2