2-(4-Nitrophenoxy)-propionic acid 2-[2-(4-nitrophenoxy)-acetoxy]-ethyl ester → 2-(4-Aminophenoxy)propionic acid-2-[2-(4-aminophenoxy)acetoxy]ethyl ester

HRID 1957860Notes

Reaction equation

HRID 1957860 reaction equation
[N+:1]([C:4]1[CH:31]=[CH:30][C:7]([O:8][CH2:9][C:10]([O:12][CH2:13][CH2:14][O:15][C:16](=[O:29])[CH:17]([O:19][C:20]2[CH:25]=[CH:24][C:23]([N+:26]([O-])=O)=[CH:22][CH:21]=2)[CH3:18])=[O:11])=[CH:6][CH:5]=1)([O-])=O>CN(C)C=O.[Pd]>[NH2:1][C:4]1[CH:31]=[CH:30][C:7]([O:8][CH2:9][C:10]([O:12][CH2:13][CH2:14][O:15][C:16](=[O:29])[CH:17]([O:19][C:20]2[CH:21]=[CH:22][C:23]([NH2:26])=[CH:24][CH:25]=2)[CH3:18])=[O:11])=[CH:6][CH:5]=1

Participants

4

Reactant 1

HCID 592539882-(4-Nitrophenoxy)-propionic acid 2-[2-(4-nitrophenoxy)-acetoxy]-ethyl ester

Product 1

HCID 497643652-(4-Aminophenoxy)propionic acid-2-[2-(4-aminophenoxy)acetoxy]ethyl esterYield 58%

Reagents, catalysts & solvents 2

HCID 23938PalladiumCatalystHCID 6228DimethylformamideSolvent

Procedure

2-(4-nitrophenoxy)propionic acid-2-[2-(4-nitrophenoxy)acetoxy]ethyl ester 55 (20 g, 50 mmol) was dissolved in dry dimethylformamide (150 ml) in a pressure vessel, palladium on carbon (5%, 5 g) added, and the mixture stirred under a hydrogen atm. (4 Kg) for 3 hrs. The catalyst was removed by filtration and ice water (1 L) was added to the filtrate. Crude 56 was extracted into ethyl acetate, dried over Na2SO4, distilled and purified by column chromatography on silica gel using chloroform:ethyl acetate (8:2) to give pure 56 (10 g, 58%) as a dark brown syrup.

Workup

  1. customThe catalyst was removed by filtration and ice water (1 L)
  2. additionwas added to the filtrate
  3. extractionCrude 56 was extracted into ethyl acetate
  4. dry with materialdried over Na2SO4
  5. distillationdistilled
  6. custompurified by column chromatography on silica gel

Sources & evidence

ORD record
ord-0827fa5c8dad4a848cacbf05dae49653
Source dataset
uspto-grants-2013_04
Patent number
US08409559B2

Reaction notes

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