Imidazole → [(1S)-1-(t-butyldiphenylsilyloxymethyl)propyl]carbamic acid benzyl ester

HRID 891631Notes

Reaction equation

HRID 891631 reaction equation
[CH2:1]([O:8][C:9](=[O:16])[NH:10][C@H:11]([CH2:14][OH:15])[CH2:12][CH3:13])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[Si:17](Cl)([C:30]([CH3:33])([CH3:32])[CH3:31])([C:24]1[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=1)[C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1.N1C=CN=C1>CN(C)C=O>[CH2:1]([O:8][C:9](=[O:16])[NH:10][C@H:11]([CH2:14][O:15][Si:17]([C:30]([CH3:33])([CH3:32])[CH3:31])([C:24]1[CH:25]=[CH:26][CH:27]=[CH:28][CH:29]=1)[C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1)[CH2:12][CH3:13])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

5

Reactant 3

HCID 795ImidazoleHCID 94078tert-ButyldiphenylchlorosilaneHCID 10263004benzyl N-((2S)-1-hydroxybutan-2-yl)carbamate

Product 1

HCID 60109785[(1S)-1-(t-butyldiphenylsilyloxymethyl)propyl]carbamic acid benzyl esterYield 107.5%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

Subsequently, to a solution of [(1S)-1-(hydroxymethyl)propyl]carbamic acid benzyl ester (4.27 g, 19.1 mmol) in dimethylformamide (128 ml) were added t-butyldiphenylsilyl chloride (5.97 ml, 22.9 mmol) and imidazole (1.56 g, 22.9 mmol) in an ice bath. The mixture was stirred at room temperature overnight. After checking the completion of the reaction, the reaction mixture was partitioned between ethyl acetate and 10% aqueous sodium chloride solution. The organic layer was washed successively with saturated aqueous sodium hydrogencarbonate solution and saturated aqueous sodium chloride solution, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The residue was purified by chromatography on a silica gel column using n-hexane:ethyl acetate (6:1→4:1) as the eluant to afford [(1S)-1-(t-butyldiphenylsilyloxymethyl)propyl]carbamic acid benzyl ester (9.48 g, yield 100%) as a white solid.

Workup

  1. customthe completion of the reaction
  2. customthe reaction mixture was partitioned between ethyl acetate and 10% aqueous sodium chloride solution
  3. washThe organic layer was washed successively with saturated aqueous sodium hydrogencarbonate solution and saturated aqueous sodium chloride solution
  4. dry with materialdried over anhydrous sodium sulfate
  5. filtrationfiltered
  6. concentrationconcentrated under reduced pressure
  7. customThe residue was purified by chromatography on a silica gel column

Sources & evidence

ORD record
ord-8d99b719df7a411a8fc98cb0fdfab74f
Source dataset
uspto-grants-2006_02
Patent number
US07001897B2

Reaction notes

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