Ammonium Chloride → HCID 67370940, compound

steps 4 and 5—A suspension of 44a (16.1 g, 37 mmol), Fe powder (8.2 g, 148 mmol, Fisher, electrolytically deposited), and NH4Cl (8.0 g, 148 mmol) in absolute ethanol (700 mL) and H2O (180 mL) was heated to reflux for 4 h. The solution was cooled to RT and filtered through CELITE®. The filter cake was washed with chloroform (2×150 mL). The filtrate was washed with aqueous NaHCO3, water, and brine and dried (K2CO3), filtered and the volatiles removed to afford 14.0 g of [4-amino-3-(3-bromo-5-chloro-phenoxy)-2-fluoro-phenyl]-acetic acid ethyl ester (44b). The aniline 44b (9.7 g, 24.1 mmol) was dissolved in anhydrous MeCN (100 mL) under nitrogen. This solution was added slowly to a mixture of tert-butyl-nitrite (7.1 mL, 60.3 mmol, assay 90%) and CuCl2 (6.5 g, 48.2 mmol) that had been prepared under nitrogen and warmed to 50° C. The reaction temperature was maintained at 50° C. for 15 min, cooled to 0° C. and poured into 5% aqueous HCl solution (80 mL) and Et2O (150 mL). The mixture was extracted with EtOAc (3×150 mL), the combined extracts were washed with brine and dried (MgSO4), filtered and the volatiles were removed. The residual oil was purified by flash SiO2 chromatography eluting with EtOAc/hexanes (0% to 10% EtOAc) to afford 6.25 g of [4-chloro-3-(3-bromo-5-chloro-phenoxy)-2-fluoro-phenyl]-acetic acid ethyl ester (44c) as an oil.

1. temperaturewas heated
2. temperatureto reflux for 4 h
3. filtrationfiltered through CELITE®
4. washThe filter cake was washed with chloroform (2×150 mL)
5. washThe filtrate was washed with aqueous NaHCO3, water, and brine
6. dry with materialdried (K2CO3)
7. filtrationfiltered
8. customthe volatiles removed

ORD record

ord-a5256d620e8b4b3f84cf3ed30e5dbe8c

Source dataset

uspto-grants-2010_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07666891B2