[CH2:1]([O:5][C:6]1[N:15]=[CH:14][CH:13]=[C:12]2[C:7]=1[C:8]1[CH:22]=[C:21]([F:23])[CH:20]=[CH:19][C:9]=1[C:10]([C:16](C)=[CH2:17])=[N:11]2)[CH2:2][CH2:3][CH3:4].C[N+]1([O-])CC[O:28]CC1>O1CCCC1.O.[Os](=O)(=O)(=O)=O>[CH2:1]([O:5][C:6]1[N:15]=[CH:14][CH:13]=[C:12]2[C:7]=1[C:8]1[CH:22]=[C:21]([F:23])[CH:20]=[CH:19][C:9]=1[C:10]([C:16](=[O:28])[CH3:17])=[N:11]2)[CH2:2][CH2:3][CH3:4]To a stirred solution of 1-butoxy-9-fluoro-6-isopropenylbenzo[c]-1,6-naphthyridine (100 mg, 0.320 mmol) in tetrahydrofuran (1.0 ml) and water (0.25 ml) was added 4-methylmorpholine 4-oxide (NMO) (39.6 mg, 0.338 mmol) followed by osmium tetroxide (525 uL of a 4 wt % aqueous solution. The reaction mixture was stirred at room temperature for 1 hr. Additional tetrahydrofuran (1.0 ml) and water (0.25 ml) were added, followed by an additional portion of NMO (39.6 mg, 0.338 mmol). The reaction mixture was partitioned between EtOAc and water. The organic layer was dried over sodium sulfate, filtered, and concentrated to a crude residue that was adsorbed on to silica gel and purified by silica gel chromatography eluting with an EtOAc/hexanes gradient to afford 1-(1-butoxy-9-fluorobenzo[c]-1,6-naphthyridin-6-yl)ethanone. LRMS (ESI) calc'd for (C18H17FN2O2) [M+H]+, 313.1; found 313.1.
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