Triethylamine → Tert-butyl 4-(4-amino-3-fluorobenzoyl)-2,2-dimethylpiperazine-1-carboxylate

HRID 1878393Notes

Reaction equation

HRID 1878393 reaction equation
[CH3:1][C:2]1([CH3:15])[CH2:7][NH:6][CH2:5][CH2:4][N:3]1[C:8]([O:10][C:11]([CH3:14])([CH3:13])[CH3:12])=[O:9].[NH2:16][C:17]1[CH:25]=[CH:24][C:20]([C:21](O)=[O:22])=[CH:19][C:18]=1[F:26].C(N(CC)CC)C.CCCP1(OP(CCC)(=O)OP(CCC)(=O)O1)=O>ClCCl.C(OCC)(=O)C>[NH2:16][C:17]1[CH:25]=[CH:24][C:20]([C:21]([N:6]2[CH2:5][CH2:4][N:3]([C:8]([O:10][C:11]([CH3:14])([CH3:13])[CH3:12])=[O:9])[C:2]([CH3:15])([CH3:1])[CH2:7]2)=[O:22])=[CH:19][C:18]=1[F:26]

Participants

7

Reactant 4

HCID 8471TriethylamineHCID 99714-Amino-3-fluorobenzoic acidHCID 111923Propylphosphonic anhydrideHCID 299224001,1-Dimethylethyl 2,2-dimethyl-1-piperazinecarboxylate

Product 1

HCID 66878622Tert-butyl 4-(4-amino-3-fluorobenzoyl)-2,2-dimethylpiperazine-1-carboxylateYield 83.3%

Reagents, catalysts & solvents 2

HCID 6344DichloromethaneSolventHCID 8857Ethyl AcetateSolvent

Procedure

To tert-butyl 2,2-dimethylpiperazine-1-carboxylate (0.902 mmol, 0.193 g) in dichloro-methane (5 mL) was added 4-amino-3-fluorobenzoic acid (0.902 mmol, 0.14 g), and triethylamine (1.805 mmol, 0.252 mL, 0.183 g). To this mixture was added 1-propanephosphonic acid cyclic anhydride (1.805 mmol, 1.074 mL, 1.149 g, 50% solution in ethyl acetate). After 2 hours stirring, ethyl acetate was added and the organic mixture was washed with saturated sodium hydrogen carbonate, water, and saturated sodium chloride. The organic layer was dried with sodium sulfate, filtered and concentrated under vacuum to give the intermediate tert-butyl 4-(4-amino-3-fluorobenzoyl)-2,2-dimethylpiperazine-1-carboxylate (264 mg).

Workup

  1. washthe organic mixture was washed with saturated sodium hydrogen carbonate, water, and saturated sodium chloride
  2. dry with materialThe organic layer was dried with sodium sulfate
  3. filtrationfiltered
  4. concentrationconcentrated under vacuum

Sources & evidence

ORD record
ord-095b4c58d62f4a2d8bbe2ca1897e8abe
Source dataset
uspto-grants-2012_11
Patent number
US08314091B2

Reaction notes

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