4-Chlorophenol → (S)-2-(4-chlorophenoxy)-1-[4-(2-methyl-6-nitro-2,3-dihydroimidazo[2,1-b]oxazol-2-ylmethyl)piperazin-1-yl]ethanone

HRID 856317Notes

Reaction equation

HRID 856317 reaction equation
Cl[CH2:2][C:3]([N:5]1[CH2:10][CH2:9][N:8]([CH2:11][C@:12]2([CH3:23])[O:16][C:15]3=[N:17][C:18]([N+:20]([O-:22])=[O:21])=[CH:19][N:14]3[CH2:13]2)[CH2:7][CH2:6]1)=[O:4].[Cl:24][C:25]1[CH:30]=[CH:29][C:28]([OH:31])=[CH:27][CH:26]=1.C(=O)([O-])[O-].[K+].[K+].CN(C=O)C>O>[Cl:24][C:25]1[CH:30]=[CH:29][C:28]([O:31][CH2:2][C:3]([N:5]2[CH2:10][CH2:9][N:8]([CH2:11][C@:12]3([CH3:23])[O:16][C:15]4=[N:17][C:18]([N+:20]([O-:22])=[O:21])=[CH:19][N:14]4[CH2:13]3)[CH2:7][CH2:6]2)=[O:4])=[CH:27][CH:26]=1

Participants

6

Reactant 4

HCID 46844-ChlorophenolHCID 6228DimethylformamideHCID 11430Potassium CarbonateHCID 69481407(S)-2-chloro-1-[4-(2-methyl-6-nitro-2,3-dihydroimidazo[2,1-b]oxazol-2-ylmethyl)piperazin-1-yl]ethanone

Product 1

HCID 69479806(S)-2-(4-chlorophenoxy)-1-[4-(2-methyl-6-nitro-2,3-dihydroimidazo[2,1-b]oxazol-2-ylmethyl)piperazin-1-yl]ethanoneYield 68.6%

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Conditions

Temperature
60 °C

Procedure

A mixture of (S)-2-chloro-1-[4-(2-methyl-6-nitro-2,3-dihydroimidazo[2,1-b]oxazol-2-ylmethyl)-piperazin-1-yl]ethanone prepared in Example 420 (300 mg, 0.87 mmol), 4-chlorophenol (170 mg, 1.32 mmol), potassium carbonate (180 mg, 1.3 mmol) and DMF (5 ml) was stirred at 60° C. for 3 hours. The reaction mixture was allowed to return to room temperature, then diluted with water. The solution was extracted with ethyl acetate twice. The organic phases were combined, washed with a sodium hydroxide solution, water and a saturated saline solution in this order, dried over magnesium sulfate and then filtered. The filtrate was concentrated under reduced pressure, and the residue was recrystallized from ethanol to afford (S)-2-(4-chlorophenoxy)-1-[4-(2-methyl-6-nitro-2,3-dihydroimidazo[2,1-b]oxazol-2-ylmethyl)piperazin-1-yl]ethanone (260 mg, yield 68%) as a light brown powder.

Workup

  1. customto return to room temperature
  2. extractionThe solution was extracted with ethyl acetate twice
  3. washwashed with a sodium hydroxide solution, water
  4. dry with materiala saturated saline solution in this order, dried over magnesium sulfate
  5. filtrationfiltered
  6. concentrationThe filtrate was concentrated under reduced pressure
  7. customthe residue was recrystallized from ethanol

Sources & evidence

ORD record
ord-d1b4da944dc34c32815d7cb9e1de0224
Source dataset
uspto-grants-2007_08
Patent number
US07262212B2

Reaction notes

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