Reaktion #815867

Reaktionsgleichung

2-(4-aminophenoxy)-2-methyl propionic acid

phenyl acetyl chloride

water

NaOH

→

2-[4-(phenylacetamido)phenoxy]-2-methyl propionic acid

Ausbeute 57.4%

Lösungsmittel

—

petroleum ether

ether

THF

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigea general reaction scheme
2. 2
   workup.ADDITIONAfter the addition
3. 3
   workup.ADDITIONis added
4. 4
   SonstigeThereafter the THF is evaporated in vacuo
5. 5
   workup.ADDITIONthe solution is then diluted with 5 ml water
6. 6
   ExtraktionThe product is extracted with ethyl ether (2×20 ml)
7. 7
   Waschenwashed with water (3×20 ml)
8. 8
   Trocknendried over anhydrous MgSO4

Vorschrift

FIG. 2C illustrates a general reaction scheme for preparing the Group I 2-[4-(arylacetamido)phenoxy]-2-methyl propionic acids. In accordance with the illustrated scheme, 1 g (0.005 mol) of 2-(4-aminophenoxy)-2-methyl propionic acid is dissolved with stirring in 10 ml of water containing 0.41 g (0.1 mol) of NaOH. To this solution, 0.79 g (0.005 mol) of phenyl acetyl chloride in 5 ml of THF is gradually added over a period of about 15 minutes. After the addition is complete the pH of the reaction mixture should be alkaline (if not a few drops of 2N NaOH is added to assure alkalinity). The reaction mixture is continuously stirred for 1 hour. Thereafter the THF is evaporated in vacuo, and the solution is then diluted with 5 ml water and acidified with concentrated hydrochloric acid. The product is extracted with ethyl ether (2×20 ml), washed with water (3×20 ml), and then dried over anhydrous MgSO4. Upon addition of petroleum ether to the ether solution, 0.9 g (56% yield) of the 2-[4-(phenylacetamido)phenoxy]-2-methyl propionic acid product precipitates as a pale brown solid, mp 173°-5° C.

Quelle