2,5-Dichlorophenol → 2-Chloro-4-(2,5-dichloro-phenoxy)-6-methyl-nicotinic acid ethyl ester

Temperature

120 °C

To a solution of 500 mg (2.136 mmol) ethyl 2,4-dichloro-6-methylpyridine-3-carboxylate (commercially available, CAS RN 86129-63-7) in 7.5 mL dry N,N-dimethylformamide was added 366 mg (2.243 mmol) 2,5-dichlorophenol and 590 mg (4.272 mmol) potassium carbonate and 41 mg (0.214 mmol) copper(I) iodide and 41 mg (0.641 mmol) copper nanopowder (avg. particle size 100 nm). The reaction mixture was stirred at 120° C. for 18 hours and then poured on 30 ml, 1N aqueous hydrochloric acid and 30 mL ethyl acetate. The layers were separated and the aqueous layer was extracted a second time with 30 mL ethyl acetate. The combined organic layers were washed with 30 mL brine, dried over magnesium sulfate, filtered and concentrated under vacuum. The residue was purified by preparative HPLC (Phenomenex Gemini column) with a gradient of acetonitrile:water (50:50 to 100:0) to afford 35 mg (18%) of the title compound as a light yellow oil. MS (ESI): 359.995 [M+H]+.

1. customThe layers were separated
2. extractionthe aqueous layer was extracted a second time with 30 mL ethyl acetate
3. washThe combined organic layers were washed with 30 mL brine
4. dry with materialdried over magnesium sulfate
5. filtrationfiltered
6. concentrationconcentrated under vacuum
7. customThe residue was purified by preparative HPLC (Phenomenex Gemini column) with a gradient of acetonitrile:water (50:50 to 100:0)

ORD record

ord-54fcc0c6f5eb4f489d969c8c316436e8

Source dataset

uspto-grants-2013_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08420647B2