[N:1]([CH2:4][C@H:5]1[O:9][C:8](=[O:10])[N:7]([C:11]2[CH:16]=[CH:15][C:14]([C:17](O)=[O:18])=[C:13]([F:20])[CH:12]=2)[CH2:6]1)=[N+:2]=[N-:3].F[P-](F)(F)(F)(F)F.[N:28]1(OC(N(C)C)=[N+](C)C)C2N=CC=CC=2N=N1.CCN(C(C)C)C(C)C.[Cl-].[NH4+]>CN(C=O)C>[N:1]([CH2:4][C@H:5]1[O:9][C:8](=[O:10])[N:7]([C:11]2[CH:16]=[CH:15][C:14]([C:17]([NH2:28])=[O:18])=[C:13]([F:20])[CH:12]=2)[CH2:6]1)=[N+:2]=[N-:3]A solution of 5-(S)-azidomethyl-3-[4′-carboxy-3′-fluorophenyl-]oxazolidine-2-one (3.2 g, 11.4 mmol; prepared as described in Example 3), O-(7-azabenzotriazol-1-yl)-N,N,N′,N′,-tetramethyluronium hexafluorophosphate (6.5 g, 17.1 mmole) and N,N′-diisopropylethylamine (5.9 g, 7.9 ml, 45.6 mmol) in DMF (12 ml) was stirred at room temperature for 20 min. Ammonium chloride (1.2 g, 22.8 mmol) was added, and the reaction mixture was stirred at r. t. overnight. Most of the solvent was removed under vacuum, and the residue taken up in ethyl acetate and washed twice with 3% aq. citric acid and brine. Organic layer was dried (Na2SO4) and concentrated under vacuum. Crude material was purified by silica gel chromatography eluting with 15% methanol in ethyl acetate to afford a white crystalline product (2.8 g, 91%). HPLC Rt=4.7, MS (m/z): [M+H]+=280.
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