Reaktion #40399

Reaktionsgleichung

sodium hydrogen carbonate

6-benzyloxy-8-(2,2-dihydroxyacetyl)-4H-benzo[1,4]oxazin-3-one

2-(4-fluorophenyl)-1,1-dimethylethylamine

sodium borohydride

→

ethanolamine

8-{2-[2-(4-fluorophenyl)-1,1-dimethylethylamino]-1-hydroxyethyl}-6-hydroxy-4H-benzo[1,4]oxazin-3-one

Lösungsmittel

ethanol

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONMolecular sieve was added
2. 2
   TemperaturAfter cooling to ambient temperature
3. 3
   Extraktionwas extracted with ethyl acetate
4. 4
   SonstigeThe organic phases were evaporated down
5. 5
   Sonstigethe residue was chromatographed (eluent: hexane-ethyl acetate-methanol)

Vorschrift

300 mg (0.91 mmol) of 6-benzyloxy-8-(2,2-dihydroxyacetyl)-4H-benzo[1,4]oxazin-3-one and 183 mg (1.09 mmol) of 2-(4-fluorophenyl)-1,1-dimethylethylamine were dissolved in 3 mL of ethanol. Molecular sieve was added and the mixture was heated to 80° C. for 30 minutes. After cooling to ambient temperature, 35 mg (0.91 mmol) of sodium borohydride was added. The mixture was stirred for 1 hour at ambient temperature, then sodium hydrogen carbonate solution was added to the reaction mixture and it was extracted with ethyl acetate. The organic phases were evaporated down and the residue was chromatographed (eluent: hexane-ethyl acetate-methanol). The ethanolamine thus obtained (223 mg) was dissolved in methanol to cleave the benzyl protecting group and hydrogenated with 150 mg palladium hydroxide as catalyst at ambient temperature and normal pressure. The catalyst was separated off by filtering through CELITE® filter agent, the filtrate was freed from solvent and the residue was chromatographed (silica gel; eluent: dichloromethane-methanol). Beige solid. Yield: 76 mg (22%); mass spectrometry: [M+H]+=375.

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