Reaktion #319542

Reaktionsgleichung

2',3'-dideoxy-5-ethyl-3'-iodouridine

→

2',3'-dideoxy-5-ethyluridine

Ausbeute 71.3%

Lösungsmittel

ammonia

water

Reaktionsbedingungen

Aufarbeitung

1. 1
   FiltrationThe mixture was filtered
2. 2
   Sonstigethe filtrate was evaporated
3. 3
   ExtraktionThe residue was extracted twice with 250 ml of hot ethyl acetate each time
4. 4
   Sonstigethe combined ethyl acetate extracts were evaporated
5. 5
   SonstigeThe residue was chromatographed on a short column of silica gel
6. 6
   Waschenfor the elution
7. 7
   Sonstigethe product was crystallized from a mixture of ethyl acetate and hexane

Vorschrift

A solution of 2.50 g of 2',3'-dideoxy-5-ethyl-3'-iodouridine in a mixture of 90 ml of ethanolic ammonia and 17 ml of water was hydrogenated over 5% palladium on barium sulfate catalyst at room temperature and under atmospheric pressure for 3 hours. The mixture was filtered and the filtrate was evaporated. The residue was extracted twice with 250 ml of hot ethyl acetate each time and the combined ethyl acetate extracts were evaporated. The residue was chromatographed on a short column of silica gel using ethyl acetate for the elution and the product was crystallized from a mixture of ethyl acetate and hexane to give 1.17 g of 2',3'-dideoxy-5-ethyluridine in the form of a white solid of melting point 109°-113° C.

Quelle