[OH:1][CH2:2][C@H:3]1[N:13]2[C:14]3[N:5]([C:6](=[O:16])[CH2:7][CH2:8][C:9]=3[CH:10]=[CH:11][C:12]2=[O:15])[CH2:4]1.CCN(CC)CC.[CH3:24][S:25](Cl)(=[O:27])=[O:26].C([O-])(O)=O.[Na+]>C(Cl)Cl>[CH3:24][S:25]([O:1][CH2:2][C@H:3]1[N:13]2[C:14]3[N:5]([C:6](=[O:16])[CH2:7][CH2:8][C:9]=3[CH:10]=[CH:11][C:12]2=[O:15])[CH2:4]1)(=[O:27])=[O:26]A solution of (1S)-1-(hydroxymethyl)-1,2,5,6-tetrahydro-4H,9H-imidazo[1,2,3-ij]-1,8-naphthyridine-4,9-dione (1.909 g, 8.67 mmol) in DCM (100 ml) at 0° C. under argon was treated with Et3N (1.450 ml, 10.40 mmol) and then methanesulfonyl chloride (0.743 ml, 9.54 mmol) and then allowed to warm to rt and stirred at rt for 1 h. The reaction mixture was then treated with saturated aqueous NaHCO3 (100 ml) and the mixture was extracted with DCM (2×100 ml). The combined organic solvents were then dried (MgSO4), filtered, evaporated to give the crude intermediate [(2S)-4,9-dioxo-1,2,8,9-tetrahydro-4H,7H-imidazo[1,2,3-ij]-1,8-naphthyridin-2-yl]methyl methanesulfonate. This was dissolved in dry CH3CN (100 ml) and then treated with pyridine (1.402 ml, 17.34 mmol) and 1,1-dimethylethyl 4-piperidinylcarbamate (3.47 g, 17.34 mmol) and heated at 70° C. for 20 h. After 20 h more 1,1-dimethylethyl 4-piperidinylcarbamate (3.47 g, 17.34 mmol) and pyridine (1.402 ml, 17.34 mmol) were added and the temperature was increased to reflux (heating block 95° C.) and reaction was stirred at this temperature for a further 4 h. The reaction mixture was then evaporated, treated with saturated aqueous NaHCO3 (200 ml) was then added and the mixture was extracted with DCM (3×200 ml). The combined organic solvents were then dried (MgSO4), filtered, evaporated to give the crude product as a brown solid.
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