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To a mixture of 6-methoxy-N-((2-(methylthio)benzo[d]thiazol-6-yl)methyl)-3-nitropyridin-2-amine (431 mg, 1.19 mmol) from Step 5 of this Example in acetic acid (6 mL) was added zinc powder (235 mg, 3.57 mmol) slowly at 0° C. The reaction mixture was stirred at 0° C. for 20 min and then stirred at rt for 4 h. The resulting reaction mixture was diluted with 30 mL of EtOAc and filtered through a Celite pad. The filtrate was neutralized with saturated aq NaHCO3. The organic layer was separated, dried over MgSO4, and concentrated under reduced pressure. The crude product was purified on a silica gel column using a mixture of EtOAc-CH2Cl2 (1:3, v/v) as eluent to give 6-methoxy-N2-((2-(methylthio)benzo[d]thiazol-6-yl)methyl)pyridine-2,3-diamine as a brown oil (389 mg, 98%). LCMS (ESI) m/z 333 (M+H)+.

1. stirringstirred at rt for 4 h
2. customThe resulting reaction mixture
3. filtrationfiltered through a Celite pad
4. customThe organic layer was separated
5. dry with materialdried over MgSO4
6. concentrationconcentrated under reduced pressure
7. customThe crude product was purified on a silica gel column
8. additiona mixture of EtOAc-CH2Cl2 (1:3