Sodium Azide → HCID 14808129, compound

Participants

Reaction Steps

A solution of ethyl 5-chloro-3-hydroxy-2-(2-oxoazetidin-1-yl)valerate (3.45 g, 13.8 mmol) and sodium azide (1.10 g, 17 mmol) in dry dimethylsulphoxide (20 ml) was stirred between 55° and 65° C. for 5 hours. The reaction mixture was diluted with dichloromethane and the organic layer was washed three times with water before being dried (MgSO4) and evaporated. The residue was chromatographed on silica gel (Merck Art. 9385), eluting with ethyl acetate/hexane (2:1), to give ethyl 5-azido-3-hydroxy-2-(2-oxoazetidin-1-yl)valerate as a pale yellow oil in 73% yield (2.59 g). Bulb to bulb distillation at 0.2 mmHg between 185°-195° C. further purified the product to a colourless oil. νmax (KBr) 3405, 2102 and 1733 cm-1 ; δH (CHCl3, 250 MHz) 1.31 (3H,t,J 7 Hz), 1.81 (1H,m), 1.87 (1H,m), 3.03 (2H,t,J 3 Hz), 3.40 (2H,m), 3.53 (2H,m), 4.00 (1H,d,J 3.5 Hz), 4.25 (3H,m) and 4.53 (1H,d,J 4.5 Hz, exchangeable). (Found: C, 46.93; H, 6.46; N, 21.83%. C10H16N3O4 requires C,46.87; H, 6.29; N, 21.86%).

Provenance & Evidence