Reaktion #344694

Reaktionsgleichung

acetic acid

[5-(3-thienyl)tetrazol-1-yl]acetic acid

1,5-pentanediol

dicyclohexylcarbodiimide

→

[5-(3-thienyl)tetrazol-1-yl]acetic acid 5-hydroxypentyl ester

Ausbeute 47.5%

Lösungsmittel

N,N-dimethylformamide

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGwas stirred for 30 min
2. 2
   FiltrationThe precipitated crystal was filtered off
3. 3
   Waschenwashed with water
4. 4
   ExtraktionThe filtrate was extracted with ethyl acetate
5. 5
   WaschenThe organic phase was washed with water
6. 6
   Trocknendried over anhydrous magnesium sulfate
7. 7
   Einengenconcentrated under reduced pressure
8. 8
   SonstigeThe resultant residue was subjected to silica gel column chromatography (eluent: chloroform/ethyl alcohol=60/0) for separation and purification

Vorschrift

To a solution of 1 g (4.76 mM) of [5-(3-thienyl)tetrazol-1-yl]acetic acid and 590 mg (5.71 mM) of 1,5-pentanediol in 10 ml of N,N-dimethylformamide was added 1.08 g (5.23 mM) of dicyclohexylcarbodiimide at room temperature. After the mixture was stirred at room temperature for 30 min, a small amount of acetic acid was added to the mixture and then was stirred for 30 min. The mixture was poured into ice-water. The precipitated crystal was filtered off and washed with water. The filtrate was extracted with ethyl acetate. The organic phase was washed with water, dried over anhydrous magnesium sulfate and then concentrated under reduced pressure. The resultant residue was subjected to silica gel column chromatography (eluent: chloroform/ethyl alcohol=60/0) for separation and purification, to give 670 mg (yield 47.5%) of [5-(3-thienyl)tetrazol-1-yl]acetic acid 5-hydroxypentyl ester.

Quelle