1-(4-Fluorophenyl)piperazine → (1-Methylpiperidin-4-yl)methyl 4-(4-fluorophenyl)piperazine-1-carboxylate

HRID 417956

Reaction equation

HRID 417956 reaction equation
[C:1](=[O:21])(OC1C=CC([N+]([O-])=O)=CC=1)[O:2][CH2:3][CH:4]1[CH2:9][CH2:8][N:7]([CH3:10])[CH2:6][CH2:5]1.CCN(C(C)C)C(C)C.[F:31][C:32]1[CH:37]=[CH:36][C:35]([N:38]2[CH2:43][CH2:42][NH:41][CH2:40][CH2:39]2)=[CH:34][CH:33]=1>CN(C=O)C>[F:31][C:32]1[CH:33]=[CH:34][C:35]([N:38]2[CH2:43][CH2:42][N:41]([C:1]([O:2][CH2:3][CH:4]3[CH2:5][CH2:6][N:7]([CH3:10])[CH2:8][CH2:9]3)=[O:21])[CH2:40][CH2:39]2)=[CH:36][CH:37]=1

Participants

5

Reactant 3

HCID 752601-(4-Fluorophenyl)piperazineHCID 81531DiisopropylethylamineHCID 57445006(1-Methylpiperidin-4-yl)methyl 4-nitrophenyl carbonate2×

Product 1

HCID 42609860(1-Methylpiperidin-4-yl)methyl 4-(4-fluorophenyl)piperazine-1-carboxylateYield 11.8%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

(1-Methylpiperidin-4-yl)methyl 4-nitrophenyl carbonate (Intermediate 1; 4.99 g, 16.9 mmol) was dissolved in DMF (40 mL). DIPEA (5.90 mL, 33.9 mmol) and 4-(4-fluoro-phenyl)piperazine (3.21 g, 17.8 mmol) were added. The reaction mixture was stirred at room temperature for 3 h and then concentrated in vacuo. The residue was dissolved in EtOAc (400 mL) and then washed sequentially with 1 M aq NaOH solution (6×150 mL), brine (50 mL), dried (MgSO4) and concentrated in vacuo. The residue was dissolved in DCM (100 mL) and methyl isocyanate resin (1.0 g) was added. The reaction mixture was shaken for 14 h, filtered and then concentrated in vacuo. The residue was purified by reverse phase chromatography (gradient eluting with MeOH in water, with 1% formic acid in each solvent, 0-30%). The resulting residue was dissolved in DCM (70 mL) and stirred with solid K2CO3 for 20 minutes, filtered and concentrated in vacuo to give (1-methylpiperidin-4-yl)methyl 4-(4-fluorophenyl)piperazine-1-carboxylate (0.67 g, 11.8%) as a pale yellow oil.

Workup

  1. concentrationconcentrated in vacuo
  2. dissolutionThe residue was dissolved in EtOAc (400 mL)
  3. washwashed sequentially with 1 M aq NaOH solution (6×150 mL), brine (50 mL)
  4. dry with materialdried (MgSO4)
  5. concentrationconcentrated in vacuo
  6. dissolutionThe residue was dissolved in DCM (100 mL)
  7. additionmethyl isocyanate resin (1.0 g) was added
  8. stirringThe reaction mixture was shaken for 14 h
  9. filtrationfiltered
  10. concentrationconcentrated in vacuo
  11. customThe residue was purified by reverse phase chromatography (gradient
  12. washeluting with MeOH in water, with 1% formic acid in each solvent, 0-30%)
  13. dissolutionThe resulting residue was dissolved in DCM (70 mL)
  14. stirringstirred with solid K2CO3 for 20 minutes
  15. filtrationfiltered
  16. concentrationconcentrated in vacuo

Sources & evidence

ORD record
ord-2e1b090cf6c0463e87ea83d24c77f027
Source dataset
uspto-grants-2012_01
Patent number
US08093248B2

Linked notes

Loading…