Sodium Azide → (5R)-5-(Azidomethyl)-3-(5-chloropyridin-2-yl)-1,3-oxazolidin-2-one

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A mixture of (5R)-5-(chloromethyl)-3-(5-chloropyridin-2-yl)-1,3-oxazolidin-2-one (2.32 g, INTERMEDIATE 7) and sodium azide (1.22 g) was heated to 100° C. in 75 ml of dimethylformamide for 15 h. The mixture was then diluted with 500 ml of water and extracted with 500 ml of ethyl acetate (3×). The combined organic layers were washed with water (250 ml) and brine (250 ml). They were then dried over sodium sulfate and concentrated in vacuo to provide 2.22 g (93%) of the title compound in >95% purity via LC/MS. Mass spectrum (ESI) 254.1 (M+1).

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