Acetic Acid → Rac-2-chloro-4-[(2s,3s)-2-(4-fluorobenzyl)-3-hydroxy-5-oxopyrrolidin-1-yl]benzonitrile

HRID 1173737Notes

Reaction equation

HRID 1173737 reaction equation
[Cl:1][C:2]1[CH:9]=[C:8]([N:10]2[C:14](=[O:15])[CH:13]=[C:12]([OH:16])[CH:11]2[CH2:17][C:18]2[CH:23]=[CH:22][C:21]([F:24])=[CH:20][CH:19]=2)[CH:7]=[CH:6][C:3]=1[C:4]#[N:5].C(O)(=O)C.[BH4-].[Na+].O>C(#N)C.[Cl-].[Na+].O>[Cl:1][C:2]1[CH:9]=[C:8]([N:10]2[C:14](=[O:15])[CH2:13][C@H:12]([OH:16])[C@@H:11]2[CH2:17][C:18]2[CH:19]=[CH:20][C:21]([F:24])=[CH:22][CH:23]=2)[CH:7]=[CH:6][C:3]=1[C:4]#[N:5]

Participants

7

Reactant 4

HCID 176Acetic AcidHCID 962WaterHCID 4311764Sodium borohydrideHCID 595569272-chloro-4-[2-(4-fluorobenzyl)-3-hydroxy-5-oxo-2,5-dihydro-1H-pyrrol-1-yl]benzonitrile

Product 1

HCID 59556939Rac-2-chloro-4-[(2s,3s)-2-(4-fluorobenzyl)-3-hydroxy-5-oxopyrrolidin-1-yl]benzonitrileYield 71.3%

Reagents, catalysts & solvents 2

HCID 6342AcetonitrileSolventHCID 57417360Sodium chloride; waterSolvent

Procedure

To a mixture of 2-chloro-4-[2-(4-fluorobenzyl)-3-hydroxy-5-oxo-2,5-dihydro-1H-pyrrol-1-yl]benzonitrile (1.00 g) and acetic acid (1.84 mL) in acetonitrile (10 mL) was added sodium borohydride (276 mg) at 0° C. in small portions. The mixture was warmed to room temperature and stirred for 1 hr. Water and saturated brine were added, and the mixture was extracted with ethyl acetate. The organic layer was washed with saturated brine, and dried over magnesium sulfate, and the solvent was evaporated under reduced pressure. The obtained residue was purified by basic silica gel column chromatography (eluent: hexane:ethyl acetate=4:1→ethyl acetate), and recrystallized from tetrahydrofuran-hexane to give the title compound as colorless crystals (yield: 717 mg, 71%).

Workup

  1. extractionthe mixture was extracted with ethyl acetate
  2. washThe organic layer was washed with saturated brine
  3. dry with materialdried over magnesium sulfate
  4. customthe solvent was evaporated under reduced pressure
  5. customThe obtained residue was purified by basic silica gel column chromatography (eluent: hexane:ethyl acetate=4:1→ethyl acetate)
  6. customrecrystallized from tetrahydrofuran-hexane

Sources & evidence

ORD record
ord-bb1b7cfc76914bd3b3d9521b7c29a167
Source dataset
uspto-grants-2010_11
Patent number
US07834051B2

Reaction notes

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