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A mixture of 6-((5-(benzyloxy)-1H-benzo[d]imidazol-1-yl)methyl)-2-(methylthio)benzo[d]thiazole (1.6 g, 3.8 mmol) from the previous step and meta-chloroperbenzoic acid (0.82 g, 4.75 mmol) in DCM (38 mL) was stirred at 0° C. for 2 h. The mixture was diluted with DCM and washed sequentially with aq Na2S2O3, saturated aq NaHCO3, and water. The organic layer was separated, dried over Na2SO4, filtered, and concentrated under reduced pressure to afford 6-((5-(benzyloxy)-1H-benzo[d]imidazol-1-yl)methyl)-2-(methylsulfinyl)benzo[d]thiazole (1.58 g, 96%) as a yellow solid. 1H NMR (300 MHz, CDCl3) δ 8.02 (d, J=8.4 Hz, 1H), 7.96 (s, 1H), 7.76 (s, 1H), 7.44-7.47 (m, 2H), 7.31-7.40 (m, 5H), 7.12 (d, J=8.7 Hz, 1H), 6.97 (m, 1H), 5.49 (s, 2H), 5.11 (s, 2H), 3.08 (s, 3H); LCMS (ESI) m/z 434 (M+H)+.

1. washwashed sequentially with aq Na2S2O3, saturated aq NaHCO3, and water
2. customThe organic layer was separated
3. dry with materialdried over Na2SO4
4. filtrationfiltered
5. concentrationconcentrated under reduced pressure