Potassium Carbonate → Ethyl 4-(4-hydroxypiperidin-1-yl)benzoate

HRID 1184499Notes

Reaction equation

HRID 1184499 reaction equation
[NH:1]1[CH2:6][CH2:5][CH:4]([OH:7])[CH2:3][CH2:2]1.C([O-])([O-])=O.[K+].[K+].F[C:15]1[CH:25]=[CH:24][C:18]([C:19]([O:21][CH2:22][CH3:23])=[O:20])=[CH:17][CH:16]=1>CC#N.CCOC(C)=O>[OH:7][CH:4]1[CH2:5][CH2:6][N:1]([C:15]2[CH:25]=[CH:24][C:18]([C:19]([O:21][CH2:22][CH3:23])=[O:20])=[CH:17][CH:16]=2)[CH2:2][CH2:3]1

Participants

6

Reactant 3

HCID 11430Potassium CarbonateHCID 67976Benzoic acid, 4-fluoro-, ethyl esterHCID 79341Piperidin-4-ol

Product 1

HCID 12717445Ethyl 4-(4-hydroxypiperidin-1-yl)benzoateYield 19.74%

Reagents, catalysts & solvents 2

HCID 6342AcetonitrileSolventHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
95 °C

Procedure

In a 200 mL round bottom flask, piperidin-4-ol (2.165 g, 21.41 mmol) and K2CO3 (2.96 g, 21.41 mmol) were suspended in MeCN (51.0 mL). Ethyl 4-fluorobenzoate (2.62 mL, 17.84 mmol) was added and the reaction mixture was stirred under reflux (95° C.) for 96 hr. The reaction was cooled to RT, diluted with EtOAc (100 mL) and washed with water (50 mL). Dried organic layer with MgSO4, filtered, and concentrated in vacuo. The product was purified by re-crystallization using EtOAc/hexanes, affording the title compound as a white solid (0.878 g, 19.74% yield). 1H NMR (400 MHz, DMSO-d6) δ ppm 1.28 (t, J=7.07 Hz, 3H) 1.34-1.47 (m, 2H) 1.73-1.85 (m, 2H) 3.03 (ddd, J=13.14, 9.98, 3.16 Hz, 2H) 3.63-3.77 (m, 3H) 4.23 (q, J=7.07 Hz, 2H) 4.72 (d, J=4.04 Hz, 1H) 6.86-7.05 (m, 2H) 7.66-7.85 (m, 2H). ESI-MS: m/z 250.2 (M+H)+.

Workup

  1. temperatureThe reaction was cooled to RT
  2. washwashed with water (50 mL)
  3. filtrationDried organic layer with MgSO4, filtered
  4. concentrationconcentrated in vacuo
  5. customThe product was purified by re-crystallization

Sources & evidence

ORD record
ord-15f39ab5997045f6a37b051e71a94266
Source dataset
uspto-grants-2014_03
Patent number
US08669249B2

Reaction notes

Loading…