Sodium hydride → (R)-2-methyl-6-nitro-2,3-dihydroimidazo[2,1-b]oxazol-2-ylmethyl 4-(4-trifluoromethylphenoxy)piperidine-1-carboxylate

HRID 856207Notes

Reaction equation

HRID 856207 reaction equation
[F:1][C:2]([F:34])([F:33])[C:3]1[CH:32]=[CH:31][C:6]([O:7][CH:8]2[CH2:13][CH2:12][N:11]([C:14]([O:16][CH2:17][C@@:18]([OH:30])([CH3:29])[CH2:19][N:20]3[CH:24]=[C:23]([N+:25]([O-:27])=[O:26])[N:22]=[C:21]3Cl)=[O:15])[CH2:10][CH2:9]2)=[CH:5][CH:4]=1.[H-].[Na+]>CN(C=O)C>[F:1][C:2]([F:34])([F:33])[C:3]1[CH:32]=[CH:31][C:6]([O:7][CH:8]2[CH2:13][CH2:12][N:11]([C:14]([O:16][CH2:17][C@:18]3([CH3:29])[O:30][C:21]4=[N:22][C:23]([N+:25]([O-:27])=[O:26])=[CH:24][N:20]4[CH2:19]3)=[O:15])[CH2:10][CH2:9]2)=[CH:5][CH:4]=1

Participants

4

Reactant 2

HCID 24758Sodium hydrideHCID 69481041(R)-3-(2-chloro-4-nitroimidazol-1-yl)-2-hydroxy-2-methylpropyl 4-(4-trifluoromethylphenoxy)-piperidine-1-carboxylate

Product 1

HCID 69482992(R)-2-methyl-6-nitro-2,3-dihydroimidazo[2,1-b]oxazol-2-ylmethyl 4-(4-trifluoromethylphenoxy)piperidine-1-carboxylateYield 47.2%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

To the solution of (R)-3-(2-chloro-4-nitroimidazol-1-yl)-2-hydroxy-2-methylpropyl 4-(4-trifluoromethylphenoxy)piperidine-1-carboxylate prepared in Example 104 (0.18 g, 0.36 mmol) in DMF (2 ml), sodium hydride (19 mg, 0.47 mmol) was added followed by stirring for 1.5 hours with cooling on ice-bath. To the reaction mixture, ice-water was added, and the solution was extracted with ethyl acetate. The organic phase was washed with water, dried over magnesium sulfate and then concentrated under reduced pressure. The residue was purified by silica gel column chromatography (methylene chloride/ethyl acetate=9/1) and recrystallized from isopropanol to afford (R)-2-methyl-6-nitro-2,3-dihydroimidazo[2,1-b]oxazol-2-ylmethyl 4-(4-trifluoromethylphenoxy)piperidine-1-carboxylate (0.08 g, yield 47%) as a white solid.

Workup

  1. temperaturewith cooling on ice-bath
  2. extractionthe solution was extracted with ethyl acetate
  3. washThe organic phase was washed with water
  4. dry with materialdried over magnesium sulfate
  5. concentrationconcentrated under reduced pressure
  6. customThe residue was purified by silica gel column chromatography (methylene chloride/ethyl acetate=9/1)
  7. customrecrystallized from isopropanol

Sources & evidence

ORD record
ord-663684a4030f4d649487c571af0faa2e
Source dataset
uspto-grants-2007_08
Patent number
US07262212B2

Reaction notes

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