Reaktion #88515

Reaktionsgleichung

6-chloro-5-fluoro-4-iodopyridin-3-ylamine

2-fluoropyridine 3-boronic acid

potassium fluoride

→

title compound

Ausbeute 75.2%

6′-Chloro-2,5′-difluoro-[3,4′]bipyridinyl-3′-ylamine

Ausbeute 75.2%

Lösungsmittel

acetonitrile

water

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturto cool to ambient temperature
2. 2
   Filtrationfiltered through Celite©
3. 3
   Waschenwashed through with ethyl acetate
4. 4
   workup.ADDITIONThe filtrate was diluted with ethyl acetate
5. 5
   Sonstigethe organic layer collected
6. 6
   Trocknendried (Na2SO4)
7. 7
   Filtrationfiltered
8. 8
   Einengenconcentrated in-vacuo
9. 9
   Sonstigeto afford a residue
10. 10
    SonstigeThe resultant residue was triturated with diethyl ether

Vorschrift

A degassed mixture of 6-chloro-5-fluoro-4-iodopyridin-3-ylamine (98.7 g, 362 mmol), 2-fluoropyridine 3-boronic acid (68.3 g, 485 mmol), bis[di-tert-butyl(4-dimethylaminophenyl)phosphine]dichloropalladium(II) (7.7 g, 10.9 mmol) and potassium fluoride (63 g, 1.09 mol) in a mixture of acetonitrile (900 mL) and water (275 mL) was heated at 90° C. for 2 hours. The reaction mixture was allowed to cool to ambient temperature and filtered through Celite© and washed through with ethyl acetate. The filtrate was diluted with ethyl acetate and the organic layer collected, dried (Na2SO4), filtered and concentrated in-vacuo to afford a residue. The resultant residue was triturated with diethyl ether to afford the title compound as a grey solid (65.8 g, 75%). The trituration liquors were concentrated and purified by flash chromatography (silica: dichloromethane to 20% ethyl acetate/dichloromethane) to afford, after trituration with ether, an additional batch of the title compound as a grey solid (9.7 g, 11%). Total yield=75.5 g, 86%. 1H NMR (400 MHz, CDCl3): 8.39 (ddd, J=4.9, 2.0, 1.1 Hz, 1H), 7.86-7.84 (m, 2H), 7.39 (ddd, J=7.4, 4.9, 1.9 Hz, 1H).

Quelle