Cl[C:2]1[N:7]=[C:6]([N:8]2[CH2:13][CH2:12][N:11]([CH3:14])[CH2:10][CH2:9]2)[N:5]=[C:4]([N:15]2[CH2:20][CH2:19][CH:18]([C:21]([NH:23][CH2:24][C:25]3[CH:30]=[CH:29][CH:28]=[CH:27][C:26]=3[C:31]([F:34])([F:33])[F:32])=[O:22])[CH2:17][CH2:16]2)[N:3]=1.[CH3:35][O-:36].[Na+]>>[CH3:35][O:36][C:2]1[N:7]=[C:6]([N:8]2[CH2:13][CH2:12][N:11]([CH3:14])[CH2:10][CH2:9]2)[N:5]=[C:4]([N:15]2[CH2:20][CH2:19][CH:18]([C:21]([NH:23][CH2:24][C:25]3[CH:30]=[CH:29][CH:28]=[CH:27][C:26]=3[C:31]([F:34])([F:33])[F:32])=[O:22])[CH2:17][CH2:16]2)[N:3]=1⅕ of the suspension prepared in step b of Example 20 (0.542 mmol, 1.00 equiv) was concentrated under reduced pressure. Then, sodium methoxide (1.24 mL of 25 wt % solution in MeOH, 5.42 mmol, 10.0 equiv) was added. The resulting mixture was heated to 80° C. for 1 h. The final solution was purified by reverse-phase HPLC (Sunfire, 20-40% CH3CN, H2O, 0.1% TFA, 12 min) to afford 12.2 mg of the title compound. MS (ES+): m/e 493.8 [M+H]+.
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