Potassium Iodide → 1-Tert-butyl-4-[2-(2-methyl-6-nitro-2,3-dihydroimidazo[2,1-b]oxazol-2-yl)ethyl]piperazin-2-one

HRID 856365Notes

Reaction equation

HRID 856365 reaction equation
CS(O[CH2:6][CH2:7][C:8]1([CH3:19])[O:12][C:11]2=[N:13][C:14]([N+:16]([O-:18])=[O:17])=[CH:15][N:10]2[CH2:9]1)(=O)=O.Cl.[C:21]([N:25]1[CH2:30][CH2:29][NH:28][CH2:27][C:26]1=[O:31])([CH3:24])([CH3:23])[CH3:22].C(N(CC)CC)C.[I-].[K+]>O.CN(C=O)C>[C:21]([N:25]1[CH2:30][CH2:29][N:28]([CH2:6][CH2:7][C:8]2([CH3:19])[O:12][C:11]3=[N:13][C:14]([N+:16]([O-:18])=[O:17])=[CH:15][N:10]3[CH2:9]2)[CH2:27][C:26]1=[O:31])([CH3:24])([CH3:22])[CH3:23]

Participants

7

Reactant 4

HCID 4875Potassium IodideHCID 8471TriethylamineHCID 230810922-(2-Methyl-6-nitro-2,3-dihydroimidazo[2,1-b]oxazol-2-yl)ethyl methanesulfonateHCID 23081273HCID 23081273, compound

Product 1

HCID 230812141-Tert-butyl-4-[2-(2-methyl-6-nitro-2,3-dihydroimidazo[2,1-b]oxazol-2-yl)ethyl]piperazin-2-oneYield 8%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 6228DimethylformamideSolvent

Conditions

Temperature
70 °C

Procedure

A mixture of 2-(2-methyl-6-nitro-2,3-dihydroimidazo[2,1-b]oxazol-2-yl)ethyl methanesulfonate prepared in Example 42 (290 mg, 1 mmol), 1-tert-butylpiperazin-2-one hydrochloride (200 mg, 1.28 mmol), triethylamine (242 mg, 2.39 mmol), potassium iodide (250 mg, 1.5 mmol) and DMF (3 ml) was stirred at 70° C. for 4 hours. The reaction mixture was allowed to return to room temperature. To the solution, water was added, and the resulting solution was extracted with ethyl acetate twice. The organic phases were combined, washed with water twice and a saturated saline solution, dried over magnesium sulfate and then filtered. The filtrate was concentrated under reduced pressure, and the residue was purified by silica gel column chromatography (methylene chloride/methanol=20/1) to afford 1-tert-butyl-4-[2-(2-methyl-6-nitro-2,3-dihydroimidazo[2,1-b]oxazol-2-yl)ethyl]piperazin-2-one (27 mg, yield 8%) as a white powder.

Workup

  1. customto return to room temperature
  2. extractionthe resulting solution was extracted with ethyl acetate twice
  3. washwashed with water twice
  4. dry with materiala saturated saline solution, dried over magnesium sulfate
  5. filtrationfiltered
  6. concentrationThe filtrate was concentrated under reduced pressure
  7. customthe residue was purified by silica gel column chromatography (methylene chloride/methanol=20/1)

Sources & evidence

ORD record
ord-73392b5fc78545599fb5fb94d4dfe5c8
Source dataset
uspto-grants-2007_08
Patent number
US07262212B2

Reaction notes

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