Imidazole → (3aR,4S,5R,6aS)-4-(((tert-Butyldimethylsilyl)oxy)methyl)-2-oxohexahydro-2H-cyclopenta[b]furan-5-yl benzoate

HRID 371445Notes

Reaction equation

HRID 371445 reaction equation
[OH:1][CH2:2][C@H:3]1[C@H:10]([O:11][C:12](=[O:19])[C:13]2[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=2)[CH2:9][C@H:8]2[C@@H:4]1[CH2:5][C:6](=[O:20])[O:7]2.N1C=CN=C1.[Si:26](Cl)([C:29]([CH3:32])([CH3:31])[CH3:30])([CH3:28])[CH3:27]>CN(C)C=O>[Si:26]([O:1][CH2:2][C@H:3]1[C@H:10]([O:11][C:12](=[O:19])[C:13]2[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=2)[CH2:9][C@H:8]2[C@@H:4]1[CH2:5][C:6](=[O:20])[O:7]2)([C:29]([CH3:32])([CH3:31])[CH3:30])([CH3:28])[CH3:27]

Participants

5

Reactant 3

HCID 795ImidazoleHCID 28928tert-Butyldimethylsilyl chlorideHCID 2724454(3aR,4S,5R,6aS)-5-(Benzoyloxy)hexahydro-4-(hydroxymethyl)-2H-cyclopenta[b]furan-2-one

Product 1

HCID 2724503(3aR,4S,5R,6aS)-4-(((tert-Butyldimethylsilyl)oxy)methyl)-2-oxohexahydro-2H-cyclopenta[b]furan-5-yl benzoateYield 97.9%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

A solution of 11.052 g of (1S,5R,6S,7R)-6-hydroxymethyl-7-benzoyloxy-2-oxabicyclo[3.3.0]octan-3-one (DOS No. 2,610,718) in 54.0 ml of absolute dimethylformamide is combined with 3.03 g of imidazole and 6.63 g of tert-butyldimethylsilyl chloride, and the mixture is stirred for 3 hours at room temperature. The solution is subsequently precipitated into 500 ml of ice water, the precipitate is suctioned off, and the residue is dissolved in methylene chloride. The organic solution is dried over magnesium sulfate and concentrated. The crude product is recrystallized from hexane, thus obtaining 15.30 g of the title compound, mp 75.8° C.

Workup

  1. customThe solution is subsequently precipitated into 500 ml of ice water
  2. dissolutionthe residue is dissolved in methylene chloride
  3. dry with materialThe organic solution is dried over magnesium sulfate
  4. concentrationconcentrated
  5. customThe crude product is recrystallized from hexane

Sources & evidence

ORD record
ord-cf8b1d4b715f41c8a02044bb836df9bf
Source dataset
uspto-grants-1985_07
Patent number
US04532236

Reaction notes

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