Ammonium Chloride → tert-Butyl-(1S,2R)-3-azido-1-(3,5-difluorobenzyl)-2-hydroxypropylcarbamate

HRID 348805Notes

Reaction equation

HRID 348805 reaction equation
[N-:1]=[N+:2]=[N-:3].[Na+].[Cl-].[NH4+].[F:7][C:8]1[CH:9]=[C:10]([CH2:15][C@H:16]([NH:20][C:21](=[O:27])[O:22][C:23]([CH3:26])([CH3:25])[CH3:24])[C@H:17]2[CH2:19][O:18]2)[CH:11]=[C:12]([F:14])[CH:13]=1>>[C:23]([O:22][C:21](=[O:27])[NH:20][C@@H:16]([CH2:15][C:10]1[CH:9]=[C:8]([F:7])[CH:13]=[C:12]([F:14])[CH:11]=1)[C@H:17]([OH:18])[CH2:19][N:1]=[N+:2]=[N-:3])([CH3:24])([CH3:25])[CH3:26]

Participants

4

Reactant 3

HCID 25517Ammonium ChlorideHCID 33557Sodium AzideHCID 9922319tert-Butyl ((S)-2-(3,5-difluorophenyl)-1-((S)-oxiran-2-yl)ethyl)carbamate

Product 1

HCID 131726251tert-Butyl-(1S,2R)-3-azido-1-(3,5-difluorobenzyl)-2-hydroxypropylcarbamate

Procedure

Sodium azide (0.22 g, 4 mmole) and ammonium chloride (2 eq) are added to tert-butyl (1S)-2-(3,5-difluorophenyl)-1-[(2S)-oxiranyl]ethylcarbamate (V, EXAMPLE 3, 0.6 g, 2 mmole). The reaction is heated to 75–80 degrees C. and stirred for 16 hours. The reaction is monitored by TLC to insure completion. The solvent is removed under reduced pressure. The concentrate is partitioned between ethyl acetate and water, the phases are separated and the organic phase is washed with bicarbonate and saline, dried over anhydrous sodium sulfate and concentrated to give the title compound, TLC (ethyl acetate/hexane) Rf=0.45; (MH+)=343.

Workup

  1. temperatureThe reaction is heated to 75–80 degrees C
  2. customThe solvent is removed under reduced pressure
  3. customThe concentrate is partitioned between ethyl acetate and water
  4. customthe phases are separated
  5. washthe organic phase is washed with bicarbonate and saline
  6. dry with materialdried over anhydrous sodium sulfate
  7. concentrationconcentrated

Sources & evidence

ORD record
ord-912a9e450fd6467d8d6e9da71eeca2a2
Source dataset
uspto-grants-2007_02
Patent number
US07176242B2

Reaction notes

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