Ammonium Chloride → HCID 178433480, compound

To a stirred solution of 3-bromo-2-(cis-4-isopropylcyclohexoxy)-6-methyl-5-nitro-pyridine (22.59 g, 63.24 mmol) in EtOH/H2O (600 mL/150 mL, 4/1 v/v), ammonium chloride (3.45 g, 63.24 mmol, 1.0 eq) and iron powder (14.27 g, 253.0 mmol, 4 eq) were added at room temperature under inert atmosphere (Ar). The reaction mixture was stirred for 3 h under heating to reflux. As TLC indicated that the starting material was consumed at this point in time, the reaction mixture was cooled to room temperature and filtered through a pad of celite. The resulting filtrate was concentrated in vacuo and the residue partitioned between a 2 molar aqueous NaOH solution (100 mL) and ethyl acetate (150 mL). After phase separation, the aqueous phase was extracted once more with ethyl acetate (2×100 mL). The organic layer was washed with brine (400 mL), dried over anhydrous Na2SO4 and filtered. The solvent was removed in vacuo to afford the title compound (21.01 g, 101%) in the form of an oil.

1. temperatureunder heating to reflux
2. customwas consumed at this point in time
3. filtrationfiltered through a pad of celite
4. concentrationThe resulting filtrate was concentrated in vacuo
5. customthe residue partitioned between a 2 molar aqueous NaOH solution (100 mL) and ethyl acetate (150 mL)
6. customAfter phase separation
7. extractionthe aqueous phase was extracted once more with ethyl acetate (2×100 mL)
8. washThe organic layer was washed with brine (400 mL)
9. dry with materialdried over anhydrous Na2SO4
10. filtrationfiltered
11. customThe solvent was removed in vacuo

ORD record

ord-522c772fc462415daf15d3354a538357

Source dataset

uspto-grants-2016_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09326513B2