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

HRID 1760996Notes

Reaction equation

HRID 1760996 reaction equation
[BH4-].[Na+].[Br:3][CH2:4][C:5](=[O:24])[C@@H:6]([NH:16][C:17](=[O:23])[O:18][C:19]([CH3:22])([CH3:21])[CH3:20])[CH2:7][C:8]1[CH:13]=[C:12]([F:14])[CH:11]=[C:10]([F:15])[CH:9]=1>C(OCC)(=O)C.CCCCCC>[Br:3][CH2:4][C@@H:5]([OH:24])[C@@H:6]([NH:16][C:17](=[O:23])[O:18][C:19]([CH3:20])([CH3:21])[CH3:22])[CH2:7][C:8]1[CH:9]=[C:10]([F:15])[CH:11]=[C:12]([F:14])[CH:13]=1

Participants

4

Reactant 2

HCID 4311764Sodium borohydrideHCID 57484758HCID 57484758, compound

Product 1

HCID 57487171tert-Butyl (1S,2S)-3-bromo-1-(3,5-difluorobenzyl)-2-hydroxypropylcarbamate

Reagents, catalysts & solvents 1

HCID 21226206Ethyl acetate hexaneSolvent

Procedure

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.

Workup

  1. customThe mixture is quenched with water (10 mL)
  2. customthe solvent removed under reduced pressure
  3. temperaturewith heat (not
  4. customexceeding 30 degrees C
  5. customThe solid is partitioned between dichloromethane and water
  6. washwashed with saline
  7. dry with materialdried over anhydrous sodium sulfate
  8. customThe solvent is removed under reduced pressure

Sources & evidence

ORD record
ord-b2fa38ff7efb455b98ff4f98d1ee8f31
Source dataset
uspto-grants-2005_01
Patent number
US06846813B2

Reaction notes

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