Réaction #155398

Équation de réaction

Ethyl-(2R)-2,3-epoxyproprionate

ammonium chloride

sodium azide

→

(R)-ethyl-3-azido-2-hydroxypropionate

Rendement 69.1%

Solvants

DMF

Conditions de réaction

Traitement

1. 1
   TempératureThe reaction was cooled to room temperature
2. 2
   Autrewas partitioned between water and ether/hexanes (1:1 v/v)
3. 3
   AutreThe phases were separated
4. 4
   Lavagethe organic phase was washed once each with water, brine
5. 5
   Séchagedried over MgSO4
6. 6
   Filtrationfiltered
7. 7
   Concentrationconcentrated to an oil, which
8. 8
   Autrewas purified by flash chromatography (silica gel/hexanes:10% ethyl acetate)

Mode opératoire

Ethyl-(2R)-2,3-epoxyproprionate (0.5 g, 4.3 mmol), ammonium chloride (0.253 g, 4.73 mmol), and sodium azide (0.336 g, 5.17 mmol) were combined in DMF (8 mL), and the mixture was heated at 75° C. for 14 hours. The reaction was cooled to room temperature, and was partitioned between water and ether/hexanes (1:1 v/v). The phases were separated, and the organic phase was washed once each with water, brine, dried over MgSO4, filtered, and concentrated to an oil, which was purified by flash chromatography (silica gel/hexanes:10% ethyl acetate) to give (R)-ethyl-3-azido-2-hydroxypropionate as a clear oil (0.47 g, 2.97 mmol, 69% yield). Rf 0.27 (hexanes: 10% EtOAc, v/v, p-anisaldehyde); MS m/e [M+Na]+ calcd 182.1. found 182.0.

Source