Reaktion #42282

Reaktionsgleichung

Sodium borohydride

tert-Butyl (1S)-3-bromo-1-(3,5-difluorobenzyl)-2-oxopropylcarbamate

→

title compound

tert-Butyl (1S,2S)-3-bromo-1-(3,5-difluorobenzyl)-2-hydroxypropylcarbamate

Lösungsmittel

ethyl acetate hexane

—

alcohol

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeThe mixture is quenched with water (10 mL)
2. 2
   Sonstigethe solvent removed under reduced pressure
3. 3
   Temperaturwith heat (not
4. 4
   Sonstigeexceeding 30 degrees C
5. 5
   SonstigeThe solid is partitioned between dichloromethane and water
6. 6
   Waschenwashed with saline
7. 7
   Trocknendried over anhydrous sodium sulfate
8. 8
   SonstigeThe solvent is removed under reduced pressure

Vorschrift

Sodium borohydride (1.32 g, 34.9 mmole, 1.1 eq.) is added to tert-Butyl (1S)-3-bromo-1-(3,5-difluorobenzyl)-2-oxopropylcarbamate (III, EXAMPLE 1, 12 g, 31.75 mmole) dissolved in absolute alcohol (500 mL) at −78 degrees C. The reaction mixture is stirred for 0.5 hour and monitored by TLC (ethyl acetate/hexane, 20/80; Rf=0.2). The mixture is quenched with water (10 mL) and the solvent removed under reduced pressure with heat (not exceeding 30 degrees C.) to dryness. The solid is partitioned between dichloromethane and water, washed with saline, dried over anhydrous sodium sulfate. The solvent is removed under reduced pressure to give the title compound, TLC (ethyl acetate/hexane, 20/80) Rf=0.2; MS (MH+)=381.2.

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