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To a stirred solution of 6-(imidazo[1,2-b]pyridazin-3-ylmethyl)-2-(methylthio)benzo[d]thiazole (350 mg, 1.1 mmol) from the previous step in DCM (30 mL) at 0° C. was added meta-chloroperbenzoic acid (194 mg, 1.1 mmol). The reaction mixture was stirred at 0° C. for 2 h. To the mixture was added saturated aq Na2S2O3 (15 mL) and the mixture was stirred for a further 0.5 h. The organic layer was separated, dried over Na2SO4, filtered, and concentrated under reduced pressure. The residue was purified by silica gel flash chromatography eluting with 2 to 5% MeOH in DCM to afford 6-(imidazo[1,2-b]pyridazin-3-ylmethyl)-2-(methylsulfinyl)benzo[d]thiazole (320 mg, 87%) as a yellow solid. 1H NMR (300 MHz, CDCl3) δ 8.33 (dd, J=4.5, 1.5 Hz, 1H), 7.91-8.00 (m, 3H), 7.62 (s, 1H), 7.54 (dd, J=8.4, 1.8 Hz, 1H), 7.03 (m, 1H), 4.52 (s, 2H), 3.05 (s, 3H); LCMS (ESI) m/z 329 (M+H)+.

1. stirringthe mixture was stirred for a further 0.5 h
2. customThe organic layer was separated
3. dry with materialdried over Na2SO4
4. filtrationfiltered
5. concentrationconcentrated under reduced pressure
6. customThe residue was purified by silica gel flash chromatography
7. washeluting with 2 to 5% MeOH in DCM