Reaktion #1914930

Reaktionsgleichung

ammonia

sodium borohydride

hydrochloric acid

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

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

→

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

Lösungsmittel

acetone

ethanol

water

ethyl acetate

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGstirred for a further 30 minutes
2. 2
   SonstigeThe organic phase is separated off
3. 3
   Trocknendried with sodium sulfate
4. 4
   workup.DISSOLUTIONThe residue is dissolved in 20 mL ethyl acetate
5. 5
   workup.ADDITIONdiluted with diethyl ether
6. 6
   workup.ADDITIONAfter the addition of a crystallization aid
7. 7
   Filtrationfiltered
8. 8
   Waschenwashed

Vorschrift

2.18 g (6.1 mmol) of benzyloxy-8-(2-ethoxy-2-hydroxyacetyl)-4H-benzo[1,4]oxazin-3-one and 1.1 g (5.8 mmol) of 2-(4-isopropylphenyl)-1,1-dimethylethylamine are stirred in 40 mL ethanol at 50° C.–80° C. for one hour. After cooling to ambient temperature, 0.24 g (6.3 mmol) sodium borohydride is added. The mixture is stirred for one hour, diluted with 5 mL acetone, and stirred for a further 30 minutes. The reaction mixture is acidified with hydrochloric acid, combined with 100 mL water and 80 mL ethyl acetate, and made alkaline with ammonia. The organic phase is separated off, dried with sodium sulfate, and freed from solvent. The residue is dissolved in 20 mL ethyl acetate and 10 mL water, acidified with concentrated hydrochloric acid and diluted with diethyl ether. After the addition of a crystallization aid, the solid precipitate is suction filtered and washed. White solid. Yield: 1.7 g (52%, hydrochloride); melting point: 220° C.–222° C.

Quelle