Reaktion #57785

Reaktionsgleichung

HCl

BCl3

1,2-difluoro-4aminobenzene

NaOH

4-Cyanopyridine

→

title compound

(2-Amino-4,5-difluoro-phenyl)-pyridin4-yl-methanone

Lösungsmittel

water

DCM

trichloroethylene

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGstirred for 30 min
2. 2
   TemperaturThe solution was then heated at 80-90° C. for 1 h
3. 3
   TemperaturThe resulting solution was refluxed at 160° C. for 4 hr
4. 4
   workup.STIRRINGstirred at RT over night
5. 5
   Temperaturrefluxed at 110° C. for 1.5 h
6. 6
   TemperaturThe reaction mixture was cooled to RT
7. 7
   SonstigeThe resulting two layers were separated
8. 8
   Extraktionthe aqueous layer was extracted with DCM
9. 9
   Trocknendried over sodium sulphate
10. 10
    Einengenconcentrated
11. 11
    SonstigeThe compound was purified by column chromatography

Vorschrift

BCl3 (6.2 ml, 1M in DCM) was added drop wise to 1,2-difluoro-4aminobenzene (0.5 g, 0.004 mol) in trichloroethylene (6.5 ml) at 0° C. and this mixture stirred for 15 min. 4-Cyanopyridine (0.48 g, 0.005 mol) was added and the solution was warmed to RT and stirred for 30 min. The solution was then heated at 80-90° C. for 1 h. The resulting solution was refluxed at 160° C. for 4 hr and stirred at RT over night. 3N HCl was added to the reaction mixture and refluxed at 110° C. for 1.5 h. The reaction mixture was cooled to RT and made basic (pH=12) with 6N NaOH. The reaction mixture was diluted with water and DCM. The resulting two layers were separated and the aqueous layer was extracted with DCM, dried over sodium sulphate and concentrated. The compound was purified by column chromatography using silica gel to yield title compound.

Quelle