2-Phenylisobutyric acid → 2-[4-(4-Chloro-butyryl)-phenyl]-2-methyl-propionic acid pyrrolidineamide

HRID 411900

Reaction equation

HRID 411900 reaction equation
[Al+3].[Cl-].[Cl-].[Cl-].[Cl:5][CH2:6][CH2:7][CH2:8][C:9](Cl)=[O:10].[CH3:12][C:13]([C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1)([CH3:17])[C:14]([OH:16])=[O:15].[N:24]1([C:29]([NH2:31])=[O:30])[CH2:28][CH2:27][CH2:26][CH2:25]1>C(Cl)(Cl)(Cl)Cl>[N:24]1([C:29]([NH2:31])=[O:30])[CH2:28][CH2:27][CH2:26][CH2:25]1.[Cl:5][CH2:6][CH2:7][CH2:8][C:9]([C:21]1[CH:22]=[CH:23][C:18]([C:13]([CH3:17])([CH3:12])[C:14]([OH:16])=[O:15])=[CH:19][CH:20]=1)=[O:10]

Participants

6

Reactant 4

HCID 132222-Phenylisobutyric acidHCID 783704-Chlorobutyryl chlorideHCID 1383351-PyrrolidinecarboxamideHCID 6451240Aluminum(III) Chloride

Product 1

HCID 698946502-[4-(4-Chloro-butyryl)-phenyl]-2-methyl-propionic acid pyrrolidineamideYield 78%

Reagents, catalysts & solvents 1

HCID 5943Carbon TetrachlorideSolvent2×

Procedure

Add AlCl3 (8.31 g, 62.3 mmol) to carbon tetrachloride (65 mL) under a nitrogen atmosphere at room temperature. Add 4-chlorobutyryl chloride (03.5 mL, 31.2 mmol), stir for 15 minutes and add, by dropwise addition over 15 minutes, a solution of 2-methyl-2-phenyl-propionic acid, pyrrolidineamide (5.64 g, 26.0 mmol) in carbon tetrachloride (60 mL). Stir at room temperature for 17 hours, pour into ice water (100 mL) and separate the layers. Wash the aqueous layer with methylene chloride (2×70 mL), 5% aqueous sodium hydrogen carbonate, combine the organic layers and dry (Na2SO4). Filter, evaporate the filtrate in vacuo and purify by silica gel chromatography (5:2 hexane/ethyl acetate) to give the title compound (6.55 g, 78%) as a light yellow oil.

Workup

  1. additionadd, by dropwise addition over 15 minutes
  2. customseparate the layers
  3. washWash the aqueous layer with methylene chloride (2×70 mL), 5% aqueous sodium hydrogen carbonate
  4. dry with materialdry (Na2SO4)
  5. filtrationFilter
  6. customevaporate the filtrate in vacuo
  7. custompurify by silica gel chromatography (5:2 hexane/ethyl acetate)

Sources & evidence

ORD record
ord-3d4dbb9a732f462c9ef31a4fd3c3f7b6
Source dataset
uspto-grants-2003_05
Patent number
US06559312B2

Linked notes

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