Imidazole → (2S,3R)-3-(tert-Butyldimethylsilanyloxy)pyrrolidine-1,2-dicarboxylic acid 1-tert-butyl ester 2-methyl ester

HRID 751105Notes

Reaction equation

HRID 751105 reaction equation
[CH3:1][O:2][C:3]([C@@H:5]1[C@H:9]([OH:10])[CH2:8][CH2:7][N:6]1[C:11]([O:13][C:14]([CH3:17])([CH3:16])[CH3:15])=[O:12])=[O:4].N1C=CN=C1.[Si:23](Cl)([C:26]([CH3:29])([CH3:28])[CH3:27])([CH3:25])[CH3:24]>C(Cl)Cl>[CH3:1][O:2][C:3]([C@@H:5]1[C@H:9]([O:10][Si:23]([C:26]([CH3:29])([CH3:28])[CH3:27])([CH3:25])[CH3:24])[CH2:8][CH2:7][N:6]1[C:11]([O:13][C:14]([CH3:17])([CH3:16])[CH3:15])=[O:12])=[O:4]

Participants

5

Reactant 3

HCID 795ImidazoleHCID 28928tert-Butyldimethylsilyl chlorideHCID 109885451,2-Pyrrolidinedicarboxylic acid, 3-hydroxy-, 1-(1,1-dimethylethyl) 2-methyl ester, (2R,3S)-rel-

Product 1

HCID 68455583(2S,3R)-3-(tert-Butyldimethylsilanyloxy)pyrrolidine-1,2-dicarboxylic acid 1-tert-butyl ester 2-methyl esterYield 98.9%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a solution of (2S,3R)—N-tert-butyloxycarbonyl-3-hydroxy-2 pyrrolidinecarboxylic acid methyl ester (1D) (0.63 g, 2.56 mmol) in CH2Cl2 (12 mL) at rt was added imidazole (0.35 g, 5.14 mmol), and then tert-butydimethylsilyl chloride (0.43 g, 2.83 mmol). After stirring for 3 h, the reaction mixture was partitioned between H2O and CH2Cl2. The CH2Cl2 layer was washed with 1 M H3PO4, NaHCO3 and brine, dried (MgSO4), then filtered and concentrated under reduced pressure. The residue was chromatographed (silica gel) eluting with 30% EtOAc/hexane to yield the title compound (0.91 g). LC/MS m/z 360 [M+H]+.

Workup

  1. customthe reaction mixture was partitioned between H2O and CH2Cl2
  2. washThe CH2Cl2 layer was washed with 1 M H3PO4, NaHCO3 and brine
  3. dry with materialdried (MgSO4)
  4. filtrationfiltered
  5. concentrationconcentrated under reduced pressure
  6. customThe residue was chromatographed (silica gel)
  7. washeluting with 30% EtOAc/hexane

Sources & evidence

ORD record
ord-a820e9c9f49040b7ade1cc48b02caa78
Source dataset
uspto-grants-2008_07
Patent number
US07405234B2

Reaction notes

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