Br[C:2]1[S:13][C:12]2[N:11]=[C:10]([CH3:14])[C:9]3[N:5]([C:6]([CH2:16][CH2:17][CH3:18])=[N:7][C:8]=3[CH3:15])[C:4]=2[N:3]=1.[CH3:19][O-:20].[Na+]>CO>[CH3:19][O:20][C:2]1[S:13][C:12]2[N:11]=[C:10]([CH3:14])[C:9]3[N:5]([C:6]([CH2:16][CH2:17][CH3:18])=[N:7][C:8]=3[CH3:15])[C:4]=2[N:3]=12-Bromo-5,6-dimethyl-8-propyl-3-thia-1,4,7,8a-tetraaza-as-indacene was dissolved in 5 mL of methanol and sodium methoxide (4.98 mg, 0.092 mmol) was added. The resulting mixture was stirred at 60° C. for 1 h. LC-MS showed complete consumption of 2-bromo-5,6-dimethyl-8-propyl-3-thia-1,4,7,8a-tetraaza-as-indacene. After removal of the solvent under reduced pressure, 5 mL of water and 10 mL of EA were added. The organic layer was concentrated, crude product was purified by prep-HPLC to give 4 mg of the title compound.
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