Reacción #6535

Ecuación de reacción

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

chloroform

sodium hydroxide

p-acetaminophenol

acetone

→

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

Rendimiento 60.0%

Condiciones de reacción

Tratamiento posterior

1. 1
   Otroa reaction scheme
2. 2
   Otroa compound that is useful as a precursor in the preparation of Group I compounds
3. 3
   workup.STIRRINGThe reaction mixture is stirred overnight at room temperature
4. 4
   Otroacetone is removed under vacuum
5. 5
   workup.DISSOLUTIONThe residue is dissolved in water (10 ml)

Procedimiento

FIG. 2A illustrates a reaction scheme for preparing 2-(4-aminophenoxy)-2-methyl propionic acid, a compound that is useful as a precursor in the preparation of Group I compounds. In accordance with the scheme of FIG. 2A, 8 grams (g) (0.2 mol) of pulverized sodium hydroxide is added to a suspension of 5.28 g (0.035 mol) of p-acetaminophenol in 23 g (0.4 mol) of acetone. The reaction mixture is stirred at room temperature for 1/2 hour. Subsequently, 3.58 g (0.03 mol) of chloroform is added dropwise over the course of 30 minutes. The reaction mixture is stirred overnight at room temperature and acetone is removed under vacuum. The residue is dissolved in water (10 ml), followed by acidification with 37% hydrochloric acid (HCl) to produce a pale yellow precipitate of 2-(4-acetaminophenoxy)-2-methyl propionic acid (5 g, 60% yield), crystallized from methanol, mp 69°-71° C.

Fuente