Réaction #725895

Équation de réaction

6-(4-Amino-phenoxy)-hexanoic acid hydrochloride

6-(4-Amino-phenoxy)-hexanoic acid Hydrochloride

methanol

HCl

→

21

6-(4-Amino-phenoxy)-hexanoic acid methyl ester

Conditions de réaction

Traitement

1. 1
   Autreat 10° C.
2. 2
   Autrefor 1 hour
3. 3
   Températurerefluxed for 48 hours
4. 4
   workup.DISTILLATIONMethanol (1.5 liter) was distilled off
5. 5
   workup.ADDITIONice water (1 liter) was added
6. 6
   ExtractionCrude 21 was extracted into chloroform
7. 7
   Lavagewashed with 5% NaHCO3 solution in water
8. 8
   Séchagedried over Na2SO4
9. 9
   workup.DISTILLATIONdistilled

Mode opératoire

To a mixture of 6-(4-Amino-phenoxy)-hexanoic acid hydrochloride 20 (150 grams, 578 mmol) in methanol (3 liters) was passed dry HCl gas at 10° C. for 1 hour and refluxed for 48 hours. Methanol (1.5 liter) was distilled off, ice water (1 liter) was added and the pH was adjusted to 7.5 with K2CO3. Crude 21 was extracted into chloroform, washed with 5% NaHCO3 solution in water, dried over Na2SO4 and distilled to give 21 (60 g, 43.8) as a thick brown syrup. The structure was confirmed with NMR.

Source