[N+:1]([C:4]1[CH:21]=[CH:20][C:7]([O:8][C:9]2[C:18]3[C:13](=[CH:14][C:15]([OH:19])=[CH:16][CH:17]=3)[N:12]=[CH:11][CH:10]=2)=[CH:6][CH:5]=1)([O-:3])=[O:2].[OH-].[Na+].[CH3:24][C:25]1([O:28][CH2:27]1)[CH3:26]>O>[CH3:24][C:25]([OH:28])([CH3:27])[CH2:26][O:19][C:15]1[CH:14]=[C:13]2[C:18]([C:9]([O:8][C:7]3[CH:20]=[CH:21][C:4]([N+:1]([O-:3])=[O:2])=[CH:5][CH:6]=3)=[CH:10][CH:11]=[N:12]2)=[CH:17][CH:16]=1To a flask containing 4-(4-nitrophenoxy)quinolin-7-ol (14.45 g, 45.33 mmol) was added a solution of sodium hydroxide (3.63 g, 90.66 mmol) in water/95% EtOH (90 mL/10 mL) followed by isobutylene oxide (12.12 mL, 136 mmol, pre-cooled to 0° C.). After stirring at 45° C. for 10 minutes, more isobutylene oxide (12.12 mL, 136 mmol, pre-cooled to 0° C.) was added. The reaction was continued to stir for additional 12 hours. The mixture was cooled to room temperature and continued to stir for 4 hours, then cooled to 0° C. and stirred for additional 10 minutes. The resulted solid was filtered, and then dissolved in DCM (130 mL). The solution was filtered and concentrated in vacuo. The residue was washed with petroleum ether (30 mL), and dried in vacuo at 45° C. overnight to afford the title compound as a yellow solid (6.86 g, 42.7%).
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