Imidazole → 1-Benzyloxycarbonyl-3-t-butyldiphenylsilyloxyazetidine

HRID 891689Notes

Reaction equation

HRID 891689 reaction equation
[CH2:1]([O:8][C:9]([N:11]1[CH2:14][CH:13]([OH:15])[CH2:12]1)=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[Si:16](Cl)([C:29]([CH3:32])([CH3:31])[CH3:30])([C:23]1[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1)[C:17]1[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1.N1C=CN=C1>CN(C)C=O>[CH2:1]([O:8][C:9]([N:11]1[CH2:14][CH:13]([O:15][Si:16]([C:29]([CH3:32])([CH3:31])[CH3:30])([C:23]2[CH:24]=[CH:25][CH:26]=[CH:27][CH:28]=2)[C:17]2[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=2)[CH2:12]1)=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

5

Reactant 3

HCID 795ImidazoleHCID 94078tert-ButyldiphenylchlorosilaneHCID 10081755Benzyl 3-hydroxyazetidine-1-carboxylate

Product 1

HCID 222429801-Benzyloxycarbonyl-3-t-butyldiphenylsilyloxyazetidineYield 98.3%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

Subsequently, to a solution of 1-benzyloxycarbonyl-3-hydroxyazetidine (1.91 g, 9.22 mmol) in dimethylformamide (96 ml) were added t-butyldiphenylsilyl chloride (2.88 ml, 11.1 mmol) and imidazole (756 mg, 11.1 mmol) in an ice bath. The resulting mixture was stirred in the ice bath for 6 hours. 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 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) as the eluant to afford 1-benzyloxycarbonyl-3-t-butyldiphenylsilyloxyazetidine (4.04 g, yield 98%) as a colorless oil.

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 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-2e250a5f34274e3f8da4dfe04b271f9e
Source dataset
uspto-grants-2006_02
Patent number
US07001897B2

Reaction notes

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