Triphenylphosphine → 2-Chloro-4-[1-(4-fluoro-phenyl)-2-methyl-1H-imidazol-4-ylethynyl]-pyridine

2-Chloro-4-iodopyridine (1.39 g, 5.8 mmol) was dissolved in 50 mL dry THF. This mixture was evacuated and backfilled with argon several times to remove oxygen from the solution. Triphenylphosphine (39 mg, 0.15 mmol) and bis(triphenylphosphine)palladium (II) chloride (170 mg, 0.24 mmol) were added and the reaction mixture was stirred at room temperature for 1 h. Copper (I) iodide (28 mg, 0.15 mmol) and 4-ethynyl-1-(4-fluoro-phenyl)-2-methyl-1H-imidazole (970 mg, 4.84 mmol) were added. The reaction mixture was stirred at room temperature for 3 days. The solvent was evaporated. The residue was taken up in 100 mL water and extracted three times with ethyl acetate (100 mL each). The combined organic extracts were dried with magnesium sulfate, filtered and evaporated. The crude product was purified by flash chromatography on silica gel (cyclohexane/ethyl acetate/triethyl amine 1:0:0->10:10:1 gradient) and recrystallized from heptane and ethyl acetate. The desired product was obtained as a white solid (545 mg, 36%), MS: m/e=312.1 (M+H+).

1. customThis mixture was evacuated
2. customto remove oxygen from the solution
3. stirringThe reaction mixture was stirred at room temperature for 3 days
4. customThe solvent was evaporated
5. extractionextracted three times with ethyl acetate (100 mL each)
6. dry with materialThe combined organic extracts were dried with magnesium sulfate
7. filtrationfiltered
8. customevaporated
9. customThe crude product was purified by flash chromatography on silica gel (cyclohexane/ethyl acetate/triethyl amine 1:0:0->10:10:1 gradient)
10. customrecrystallized from heptane and ethyl acetate

ORD record

ord-24b997c0a7124c048a312e64e265bb0b

Source dataset

uspto-grants-2009_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07531529B2