Реакция #725895

Уравнение реакции

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

Условия реакции

Обработка

1. 1
   Другоеat 10° C.
2. 2
   Другоеfor 1 hour
3. 3
   Температураrefluxed for 48 hours
4. 4
   workup.DISTILLATIONMethanol (1.5 liter) was distilled off
5. 5
   workup.ADDITIONice water (1 liter) was added
6. 6
   ЭкстракцияCrude 21 was extracted into chloroform
7. 7
   Промывкаwashed with 5% NaHCO3 solution in water
8. 8
   Сушкаdried over Na2SO4
9. 9
   workup.DISTILLATIONdistilled

Методика

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.

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