Triethylamine → Tert-butyl 4-(5-(2-phenyl-5-(trifluoromethyl)oxazole-4-carboxamido)pyridin-2-yl)piperazine-1-carboxylate

HRID 1641830Notes

Reaction equation

HRID 1641830 reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][N:11]([C:14]2[CH:19]=[CH:18][C:17]([NH2:20])=[CH:16][N:15]=2)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[C:21]1([C:27]2[O:28][C:29]([C:35]([F:38])([F:37])[F:36])=[C:30]([C:32](O)=[O:33])[N:31]=2)[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=1.F[P-](F)(F)(F)(F)F.Br[P+](N1CCCC1)(N1CCCC1)N1CCCC1.C(N(CC)CC)C>CN(C)C=O.C(Cl)Cl>[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][N:11]([C:14]2[CH:19]=[CH:18][C:17]([NH:20][C:32]([C:30]3[N:31]=[C:27]([C:21]4[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=4)[O:28][C:29]=3[C:35]([F:37])([F:38])[F:36])=[O:33])=[CH:16][N:15]=2)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:2])[CH3:3]

Participants

7

Reactant 4

HCID 8471TriethylamineHCID 2733179PyBroPHCID 27764382-Phenyl-5-(trifluoromethyl)-oxazole-4-carboxylic acidHCID 17999304tert-Butyl 4-(5-aminopyridin-2-yl)piperazine-1-carboxylate

Product 1

HCID 52937267Tert-butyl 4-(5-(2-phenyl-5-(trifluoromethyl)oxazole-4-carboxamido)pyridin-2-yl)piperazine-1-carboxylate

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 6344DichloromethaneSolvent

Procedure

4-(5-Amino-pyridin-2-yl)-piperazine-1-carboxylic acid tert-butyl ester was mixed with 2-phenyl-5-trifluoromethyloxazole-4-carboxylic acid (771 mg, 3.0 mmol) and bromotrispyrrolidinophosphonium hexafluorophosphate (1.40 g, 3.0 mmol) in N,N-dimethylformamide (20 mL) and methylene chloride (5 mL) containing triethylamine (0.85 mL). The mixture was stirred at room temperature overnight and the solvents were evaporated. The residue was extracted with ethyl acetate and water. The organic layer was dried over sodium sulfate, filtered and concentrated. The residue was triturated with ethyl acetate and the solid was filtered to give 4-{5-[(2-phenyl-5-trifluoromethyl-oxazole-4-carbonyl)-amino]-pyridin-2-yl}-piperazine-1-carboxylic acid tert-butyl ester (1.09 g). LC-MS calcd for C25H26F3N5O4 (m/e) 517.5, obsd 518.1 (M+H). The NMR spectrum obtained on the sample is compatible with its structure.

Workup

  1. customthe solvents were evaporated
  2. extractionThe residue was extracted with ethyl acetate and water
  3. dry with materialThe organic layer was dried over sodium sulfate
  4. filtrationfiltered
  5. concentrationconcentrated
  6. customThe residue was triturated with ethyl acetate
  7. filtrationthe solid was filtered

Sources & evidence

ORD record
ord-d0d7b69d4c9a47068516a4e26670d94e
Source dataset
uspto-grants-2012_02
Patent number
US08115011B2

Reaction notes

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