Reaktion #611091

Reaktionsgleichung

NaH

II

(5-Benzyloxy-pyridin-2-yl)-pyridin-2-yl-amine

Na2S2O3

ethyl 7-bromoheptanoate

→

III

Ausbeute 56.4%

7-[(5-Benzyloxy-pyridin-2-yl)-pyridin-2-yl-amino]-heptanoic acid ethyl ester

Ausbeute 56.4%

Lösungsmittel

DMF

EtOAc

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONwere added
2. 2
   Sonstigethe phases were separated
3. 3
   Extraktionthe aqueous extracted with EtOAc (2×25 mL)
4. 4
   TrocknenThe organic phases were combined then dried over MgSO4
5. 5
   Filtrationfiltered
6. 6
   Sonstigesubsequently evaporated under reduced pressure
7. 7
   SonstigeThe resulting residue was purified by silica gel column chromatography
8. 8
   Wascheneluting with hexane/EtOAc (80:20

Vorschrift

NaH (48 mg, 1.26 6 mmol) was added to II (350 mg, 1.26 mmol) in DMF (6 mL) at rt. After 10 min, KI (314 mg, 1.89 mmol) and ethyl 7-bromoheptanoate (0.370 mL, 1.89 mmol) were added. The reaction mixture was stirred at 90° C. for 18 h30 after which 0.1 M Na2S2O3 (50 mL) and EtOAc (50 mL) were added, the phases were separated and the aqueous extracted with EtOAc (2×25 mL). The organic phases were combined then dried over MgSO4, filtered, and subsequently evaporated under reduced pressure. The resulting residue was purified by silica gel column chromatography eluting with hexane/EtOAc (80:20 then 70:30) to furnish III as a colourless oil (308 mg, 56%).

Quelle