Triethylamine → (S)-4-(2-methyl-6-nitro-2,3-dihydroimidazo[2,1-b]oxazol-2-ylmethyl)piperazine-1-carboxylic acid (4-trifluoromethylphenyl)amide

HRID 856330Notes

Reaction equation

HRID 856330 reaction equation
Cl.Cl.[CH3:3][C@@:4]1([CH2:15][N:16]2[CH2:21][CH2:20][NH:19][CH2:18][CH2:17]2)[O:8][C:7]2=[N:9][C:10]([N+:12]([O-:14])=[O:13])=[CH:11][N:6]2[CH2:5]1.C(N(CC)CC)C.[NH2:29][C:30]1[CH:35]=[CH:34][C:33]([C:36]([F:39])([F:38])[F:37])=[CH:32][CH:31]=1.[C:40](N1C=CN=C1)(N1C=CN=C1)=[O:41]>C(Cl)Cl.O.CN(C=O)C>[F:39][C:36]([F:37])([F:38])[C:33]1[CH:34]=[CH:35][C:30]([NH:29][C:40]([N:19]2[CH2:18][CH2:17][N:16]([CH2:15][C@:4]3([CH3:3])[O:8][C:7]4=[N:9][C:10]([N+:12]([O-:14])=[O:13])=[CH:11][N:6]4[CH2:5]3)[CH2:21][CH2:20]2)=[O:41])=[CH:31][CH:32]=1

Participants

8

Reactant 4

HCID 8471TriethylamineHCID 99644-(Trifluoromethyl)anilineHCID 682631,1'-CarbonyldiimidazoleHCID 69481767(S)-2-methyl-6-nitro-2-(piperazin-1-ylmethyl)-2,3-dihydroimidazo[2,1-b]oxazole dihydrochloride

Product 1

HCID 86604818(S)-4-(2-methyl-6-nitro-2,3-dihydroimidazo[2,1-b]oxazol-2-ylmethyl)piperazine-1-carboxylic acid (4-trifluoromethylphenyl)amideYield 23%

Reagents, catalysts & solvents 3

HCID 962WaterSolventHCID 6228DimethylformamideSolventHCID 6344DichloromethaneSolvent

Procedure

(S)-2-Methyl-6-nitro-2-(piperazin-1-ylmethyl)-2,3-dihydroimidazo[2,1-b]oxazole dihydrochloride prepared in Example 408 (236 mg, 0.88 mmol) was dissolved in a mixture of methylene chloride (5 ml) and triethylamine (2 ml, 14.35 mmol). To the solution, a mixture of 4-aminobenzotrifluoride (142 mg, 0.882 mmol), 1,1′-carbonyldiimidazole (143 mg, 0.882 mmol) and DMF (6 ml) stirred at room temperature overnight was added followed by stirring at room temperature for 6 hours. To the reaction mixture, water was added, and the mixture was extracted with ethyl acetate. The organic phase was washed with water three times and a saturated saline solution, dried over sodium sulfate and then filtered. The filtrate was concentrated under reduced pressure, and the residue was purified by silica gel column chromatography (methylene chloride/methanol=30/1) to afford (S)-4-(2-methyl-6-nitro-2,3-dihydroimidazo[2,1-b]oxazol-2-ylmethyl)piperazine-1-carboxylic acid (4-trifluoromethylphenyl)amide (90 mg, yield 23%) as a white powder.

Workup

  1. additionwas added
  2. stirringby stirring at room temperature for 6 hours
  3. extractionthe mixture was extracted with ethyl acetate
  4. washThe organic phase was washed with water three times
  5. dry with materiala saturated saline solution, dried over sodium sulfate
  6. filtrationfiltered
  7. concentrationThe filtrate was concentrated under reduced pressure
  8. customthe residue was purified by silica gel column chromatography (methylene chloride/methanol=30/1)

Sources & evidence

ORD record
ord-9046d6f4c13c441d9130b31a86c3d1a7
Source dataset
uspto-grants-2007_08
Patent number
US07262212B2

Reaction notes

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