Imidazole → (2S,4R)-1-tert-Butyl 2-methyl 4-((tert-butyldimethylsilyl)oxy)pyrrolidine-1,2-dicarboxylate

HRID 1029644Notes

Reaction equation

HRID 1029644 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:12][C@H:11]([OH:13])[CH2:10][C@H:9]1[C:14]([O:16][CH3:17])=[O:15])=[O:7])([CH3:4])([CH3:3])[CH3:2].N1C=CN=C1.[Si:23](Cl)([C:26]([CH3:29])([CH3:28])[CH3:27])([CH3:25])[CH3:24]>ClCCl>[Si:23]([O:13][C@H:11]1[CH2:12][N:8]([C:6]([O:5][C:1]([CH3:4])([CH3:3])[CH3:2])=[O:7])[C@H:9]([C:14]([O:16][CH3:17])=[O:15])[CH2:10]1)([C:26]([CH3:29])([CH3:28])[CH3:27])([CH3:25])[CH3:24]

Participants

5

Reactant 3

HCID 795ImidazoleHCID 28928tert-Butyldimethylsilyl chlorideHCID 2734883(2S,4R)-4-Hydroxypyrrolidine-1,2-dicarboxylic acid 1-tert-butyl ester 2-methyl ester

Product 1

HCID 10618477(2S,4R)-1-tert-Butyl 2-methyl 4-((tert-butyldimethylsilyl)oxy)pyrrolidine-1,2-dicarboxylateYield 102.7%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

To a solution of (2S,4R)-1-(tert-butoxycarbonyl)-4-hydroxy-2-methoxycarbonylpyrrolidine (21.46 g) and imidazole (7.74 g) in dichloromethane (150 ml) was added dropwise a solution of tert-butyldimethylsilyl chloride (14.67 g) in dichloromethane (30 ml) at room temperature. After two hours, resultant precipitate was filtered off, and the filtrate was washed in turn with water and brine. Evaporation of the solvent gave an oil, which was chromatographed on silica gel (500 ml) eluting with a mixture of hexane and ethyl acetate (2:1, V/V) to give (2S,4R)-4-(tert-butyldimethylsilyloxy)-1-(tert-butoxycarbonyl)-2-methoxycarbonylpyrrolidine (32.3 g).

Workup

  1. filtrationresultant precipitate was filtered off
  2. washthe filtrate was washed in turn with water and brine
  3. customEvaporation of the solvent
  4. customgave an oil, which
  5. customwas chromatographed on silica gel (500 ml)
  6. washeluting with a mixture of hexane and ethyl acetate (2:1, V/V)

Sources & evidence

ORD record
ord-aa0ecdefad9047b391c0151c8bdf732b
Source dataset
uspto-grants-1992_04
Patent number
US05102877

Reaction notes

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