[CH3:1][O:2][C:3]1[N:12]=[C:11]2[C:6]([CH2:7][CH2:8][C:9](=[O:13])[NH:10]2)=[CH:5][CH:4]=1.[H-].[Na+].[N+](C1C=C(S(O[CH2:29][C@@H:30]2[CH2:32][O:31]2)(=O)=O)C=CC=1)([O-])=O.O>CN(C=O)C>[CH3:1][O:2][C:3]1[N:12]=[C:11]2[C:6]([CH2:7][CH2:8][C:9](=[O:13])[N:10]2[CH2:29][C@@H:30]2[CH2:32][O:31]2)=[CH:5][CH:4]=1A solution of 7-(methyloxy)-3,4-dihydro-1,8-naphthyridin-2(1H)-one (4.974 g, 27.9 mmol) in DMF (100 ml) at 0° C. under argon was treated with sodium hydride (60%, 1.340 g, 33.5 mmol) and allowed to stir at 0° C. for 20 min. The reaction mixture was then treated with (2S)-2-oxiranylmethyl 3-nitrobenzenesulfonate (7.60 g, 29.3 mmol) and then then allowed warm slowly to rt and stirred at rt for 1 h. Water (5 ml) was then added. Reaction was evaporated, saturated aqueous NaHCO3 (500 ml) was then added and the mixture was extracted with DCM (3×500 ml). The combined organic solvents were then dried (MgSO4), filtered, evaporated to give the crude product.
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