Acetic Acid → tert-Butyl 4-(4-fluoroanilino)piperidine-1-carboxylate

HRID 883758Notes

Reaction equation

HRID 883758 reaction equation
O=[C:2]1[CH2:7][CH2:6][N:5]([C:8]([O:10][C:11]([CH3:14])([CH3:13])[CH3:12])=[O:9])[CH2:4][CH2:3]1.[F:15][C:16]1[CH:22]=[CH:21][C:19]([NH2:20])=[CH:18][CH:17]=1.C(O)(=O)C.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+]>ClCCCl>[F:15][C:16]1[CH:22]=[CH:21][C:19]([NH:20][CH:2]2[CH2:7][CH2:6][N:5]([C:8]([O:10][C:11]([CH3:14])([CH3:13])[CH3:12])=[O:9])[CH2:4][CH2:3]2)=[CH:18][CH:17]=1

Participants

6

Reactant 4

HCID 176Acetic AcidHCID 97314-FluoroanilineHCID 735900tert-Butyl 4-oxopiperidine-1-carboxylateHCID 5049666Sodium triacetoxyborohydride

Product 1

HCID 16413902tert-Butyl 4-(4-fluoroanilino)piperidine-1-carboxylate

Reagents, catalysts & solvents 1

HCID 111,2-DichloroethaneSolvent

Procedure

A mixture of 1,1-dimethylethyl 4-oxo-1-piperidinecarboxylate (1 g, 5 mmol), 4-fluoroaniline (0.56 g, 5 mmol) and acetic acid (0.26 ml, 5 mmol) in 1,2-DCE (30 ml) was stirred at room temperature for 24 h. Sodium tri(acetoxy)borohydride (1.48 g, 7 mmol) was then added and stirring continued for 24 h. The reaction mixture was washed with water, dried (MgSO4) and then concentrated in vacuo to give the title compound as a crude solid (1.6 g). δH (CDCl3, 250 MHz) 6.88 (2H, t), 6.54 (2H, dd), 4.04 (2H, m), 3.35 (1H, m), 2.91 (2H, m), 2.02 (2H, m), 1.46 (9H, s), 1.30 (2H, m).

Workup

  1. stirringstirring
  2. waitcontinued for 24 h
  3. washThe reaction mixture was washed with water
  4. dry with materialdried (MgSO4)
  5. concentrationconcentrated in vacuo

Sources & evidence

ORD record
ord-408f3dfe201d4b0ab526c3854680cbe1
Source dataset
uspto-grants-2012_08
Patent number
US08236953B2

Reaction notes

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