Reaktion #466603

Reaktionsgleichung

acetic acid

N-benzyl-6-chloro-nicotinamide

o-tolylmagnesium chloride

→

N-benzyl-6-chloro-4-o-tolyl-nicotinamide

Ausbeute 89.1%

Lösungsmittel

THF

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturthe reaction mixture was cooled again to 0° C.
2. 2
   workup.STIRRINGAfter stirring for 1 hour at room temperature
3. 3
   Filtrationthe reaction mixture was filtered
4. 4
   workup.ADDITIONthe filtrate was poured onto 20 ml
5. 5
   workup.ADDITIONSodium bicarbonate was added portionwise
6. 6
   Sonstigethe phases were separated
7. 7
   ExtraktionThe aqueous layer was extracted with dichloromethane
8. 8
   WaschenThe combined organic extracts were washed with water
9. 9
   Trocknendried (Na2SO4)
10. 10
    Sonstigeevaporated
11. 11
    SonstigeThe residue was purified by flash chromatography (eluent ethyl acetate/n-hexane 2:1)

Vorschrift

A solution of 0.5 g (2.0 mMol) N-benzyl-6-chloro-nicotinamide in 5.0 ml THF was added over 25 minutes to 10.1 ml (10.1 mMol) of o-tolylmagnesium chloride solution (1M in THF) cooled to 0° C. After 2.5 hours stirring at room temperature, the reaction mixture was cooled again to 0° C. and 4.0 ml acetic acid were added over 15 minutes followed by 1.1 g (4.1 mMol) manganese triacetate dihydrate. After stirring for 1 hour at room temperature, the reaction mixture was filtered and the filtrate was poured onto 20 ml deionized water. Sodium bicarbonate was added portionwise to bring the pH to 7 and the phases were separated. The aqueous layer was extracted with dichloromethane. The combined organic extracts were washed with water, dried (Na2SO4) and evaporated. The residue was purified by flash chromatography (eluent ethyl acetate/n-hexane 2:1) to yield 0.6 g (88%) N-benzyl-6-chloro-4-o-tolyl-nicotinamide as an orange resin.

Quelle