5-azidopentan-2-one

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 5-Chloro-2-pentanone ethylene ketal (5.0 g, 30.4 mmol) was stirred in DMF with lithium azide (5.95 g, 120 mmol) at 60° C. for 48 hrs. The mixture was evaporated to dryness. The product was then dissolved in toluene (50 ml) and washed with water (3×15 ml). The organic phase was evaporated and the resulting 5-azido-2-pentanone ethylene ketal was stirred in 50 ml of 70% trifluoroacetic acid for 24 hrs. The reaction mixture was neutralized with sodium bicarbonate and extracted with ethyl acetate. The organic phase was dried over magnesium sulfate and evaporated to yield the desired ketone as an oil. The mixture was evaporated to dryness The product was then dissolved in toluene (50 ml) washed with water (3×15 ml) The organic phase was evaporated extracted with ethyl acetate The organic phase was dried over magnesium sulfate evaporated