Acetic Acid → tert-Butyl 4-(3-fluoroanilino)piperidine-1-carboxylate

HRID 906339Notes

Reaction equation

HRID 906339 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:17]=[C:18]([CH:20]=[CH:21][CH:22]=1)[NH2:19].C(O)(=O)C.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+]>ClCCCl.C(Cl)Cl>[F:15][C:16]1[CH:17]=[C:18]([NH:19][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:20]=[CH:21][CH:22]=1

Participants

7

Reactant 4

HCID 176Acetic AcidHCID 97423-FluoroanilineHCID 735900tert-Butyl 4-oxopiperidine-1-carboxylateHCID 5049666Sodium triacetoxyborohydride

Product 1

HCID 23137591tert-Butyl 4-(3-fluoroanilino)piperidine-1-carboxylateYield 82%

Reagents, catalysts & solvents 2

HCID 111,2-DichloroethaneSolventHCID 6344DichloromethaneSolvent

Procedure

A mixture of 1,1-dimethylethyl 4-oxo-1-piperidinecarboxylate (1.91 g, 9.53 mmol), 3-fluoroaniline (1.06 g, 9.53 mmol) and acetic acid (0.55 ml, 9.53 mmol) in 1,2-DCE (50 ml) was stirred at room temperature overnight. Sodium tri(acetoxy)borohydride (2.82 g, 13.3 mmol) was then added and the reaction mixture was stirred for 8 h, then allowed to stand at room temperature. The reaction mixture was diluted with DCM and washed with NaHCO3 solution, dried over MgSO4 and then concentrated to give the product which was purified by column chromatography. Elution with 0-40% EtOAc/pentane gave the title compound as a white solid (2.3 g). δH (CDCl3, 250 MHz) 7.08 (1H, q), 6.35 (3H, m), 4.04 (1H, br s), 3.65 (1H, br s), 3.38 (1H, m), 2.92 (2H, m), 2.02 (2H, m), 1.47 (9H, s), 1.34 (2H, m).

Workup

  1. stirringthe reaction mixture was stirred for 8 h
  2. customto stand at room temperature
  3. washwashed with NaHCO3 solution
  4. dry with materialdried over MgSO4
  5. concentrationconcentrated
  6. customto give the product which
  7. customwas purified by column chromatography
  8. washElution with 0-40% EtOAc/pentane

Sources & evidence

ORD record
ord-23fb081717544940bd255943e5d96d8b
Source dataset
uspto-grants-2011_09
Patent number
US08012981B2

Reaction notes

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