Réaction #2492361

Équation de réaction

2-(4-Amino-phenoxy)-propionic acid

HCl

Methanol

→

64

Rendement 37.2%

2-(4-Amino-phenoxy)-propionic acid methyl ester

Rendement 37.2%

Conditions de réaction

Traitement

1. 1
   Autreat 10° C.
2. 2
   Autrefor 1 hour
3. 3
   Températurerefluxed for 48 hours
4. 4
   workup.DISTILLATIONMethanol (2.5 liter) was distilled
5. 5
   workup.ADDITIONice water (1 liter) was added
6. 6
   ExtractionCrude 64 was extracted into chloroform
7. 7
   Lavagewashed with 5% NaHCO3 solution, water
8. 8
   Séchagedried over Na2SO4
9. 9
   workup.DISTILLATIONdistilled

Mode opératoire

To a mixture of 2-(4-Amino-phenoxy)-propionic acid 63 (240 grams, 1.103 mmol), in Methanol (4.8 liters) was passed dry HCl gas at 10° C. for 1 hour and refluxed for 48 hours. Methanol (2.5 liter) was distilled, ice water (1 liter) was added and the pH was adjusted to 7.5 with K2CO3. Crude 64 was extracted into chloroform, washed with 5% NaHCO3 solution, water, dried over Na2SO4 and distilled to give 64 (80 grams, 37.2%) as a brown syrup. The structure was confirmed with NMR. IHNMR (CDCl3) δ 1.56(d, 3H,CH3), 2.9(bs, 2H,—NH2), 3.72(s,3H,ester), 4.58(q,1H,CH), 6.53 (d,2H,Ar), 6.68(d,2H,Ar).

Source