Reaktion #85152

Reaktionsgleichung

tert-butyl 2-[4-(5-chloro-2-cyanophenyl)-5-methoxy-2-oxopyridin-1(2H)-yl]-3-(3-ethyloxetan-3-yl)prop-2-enoate

→

tert-Butyl 2-[4-(5-chloro-2-cyanophenyl)-5-methoxy-2-oxopyridin-1(2H)-yl]-3-(3-ethyloxetan-3-yl)propanoate

Lösungsmittel

ammonium chloride

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeAt RT
2. 2
   SonstigeAfter phase separation
3. 3
   Extraktionthe aqueous phase was extracted three times with 25 ml of ethyl acetate
4. 4
   TrocknenThe combined organic phases were dried over magnesium sulphate
5. 5
   Filtrationfiltered
6. 6
   Sonstigethe solvent was removed under reduced pressure
7. 7
   SonstigeThe residue was purified by flash chromatography (120 g silica cartridge, 85 ml/min, cyclohexane/ethyl acetate gradient)

Vorschrift

At RT, 302 mg (641 μmol) of tert-butyl 2-[4-(5-chloro-2-cyanophenyl)-5-methoxy-2-oxopyridin-1(2H)-yl]-3-(3-ethyloxetan-3-yl)prop-2-enoate (isomer mixture) were admixed with 20 ml of a “Hot Stryker's” reagent solution [B. A. Baker et al. Org. Lett. 2008, 10, 289-292]. The reaction mixture was stirred at RT for 1.5 h, and 20 ml of saturated aqueous ammonium chloride solution were then added. After phase separation, the aqueous phase was extracted three times with 25 ml of ethyl acetate. The combined organic phases were dried over magnesium sulphate and filtered, and the solvent was removed under reduced pressure. The residue was purified by flash chromatography (120 g silica cartridge, 85 ml/min, cyclohexane/ethyl acetate gradient). Yield: 275 mg (91% of theory)

Quelle