Trifluoroacetic acid → (S)-N-(5-chlorobenzofuran-2-ylmethylene)-N-[4-(2-methyl-6-nitro-2,3-dihydroimidazo[2,1-b]oxazol-2-ylmethyl)piperazin-1-yl]amine

HRID 856342Notes

Reaction equation

HRID 856342 reaction equation
[CH3:1][C@@:2]1([CH2:13][N:14]2[CH2:19][CH2:18][N:17]([NH:20][C:21](=O)OC(C)(C)C)[CH2:16][CH2:15]2)[O:6][C:5]2=[N:7][C:8]([N+:10]([O-:12])=[O:11])=[CH:9][N:4]2[CH2:3]1.[Cl:28][C:29]1[CH:30]=[CH:31][C:32]2[O:36][C:35](C=O)=[CH:34][C:33]=2[CH:39]=1.FC(F)(F)C(O)=O.C(=O)([O-])O.[Na+]>C(Cl)Cl>[Cl:28][C:29]1[CH:30]=[CH:31][C:32]2[O:36][C:35]([CH:21]=[N:20][N:17]3[CH2:16][CH2:15][N:14]([CH2:13][C@:2]4([CH3:1])[O:6][C:5]5=[N:7][C:8]([N+:10]([O-:12])=[O:11])=[CH:9][N:4]5[CH2:3]4)[CH2:19][CH2:18]3)=[CH:34][C:33]=2[CH:39]=1

Participants

6

Reactant 4

HCID 6422Trifluoroacetic acidHCID 516892Sodium BicarbonateHCID 134001705-Chloro-1-benzofuran-2-carbaldehydeHCID 86760538tert-butyl(S)-[4-(2-methyl-6-nitro-2,3-dihydroimidazo[2,1-b]oxazol-2-ylmethyl)piperazin-1-yl]carbamate

Product 1

HCID 69480120(S)-N-(5-chlorobenzofuran-2-ylmethylene)-N-[4-(2-methyl-6-nitro-2,3-dihydroimidazo[2,1-b]oxazol-2-ylmethyl)piperazin-1-yl]amineYield 59%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a mixture of tert-butyl (S)-[4-(2-methyl-6-nitro-2,3-dihydroimidazo[2,1-b]oxazol-2-ylmethyl)piperazin-1-yl]carbamate prepared in Example 503 (0.20 g, 0.523 mmol) and 5-chlorobenzofuran-2-carbaldehyde (0.113 g, 0.628 mmol) and methylene chloride (4 ml), trifluoroacetic acid (0.4 ml) was added followed by stirring at room temperature for 2 hours. To the reaction mixture, a saturated sodium hydrogencarbonate solution was added followed by extraction with methylene chloride. The organic phase was washed with a saturated saline solution, dried over sodium sulfate and then filtered. The resulting filtrate was concentrated under reduced pressure, and the residue was purified by silica gel column chromatography (methylene chloride/ethyl acetate=4/1) to afford (S)-N-(5-chlorobenzofuran-2-ylmethylene)-N-[4-(2-methyl-6-nitro-2,3-dihydroimidazo[2,1-b]oxazol-2-ylmethyl)piperazin-1-yl]amine (0.137 g, yield 59%) as a light yellow powder.

Workup

  1. additionwas added
  2. extractionfollowed by extraction with methylene chloride
  3. washThe organic phase was washed with a saturated saline solution
  4. dry with materialdried over sodium sulfate
  5. filtrationfiltered
  6. concentrationThe resulting filtrate was concentrated under reduced pressure
  7. customthe residue was purified by silica gel column chromatography (methylene chloride/ethyl acetate=4/1)

Sources & evidence

ORD record
ord-406a6c4b976648258569c47a5f7d2751
Source dataset
uspto-grants-2007_08
Patent number
US07262212B2

Reaction notes

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