[N:1]1[C:5]2[CH:6]=[CH:7][CH:8]=[N:9][C:4]=2[NH:3][CH:2]=1.[H-].[Na+].Cl[CH2:13][C:14]1[CH:24]=[CH:23][C:17]2[N:18]=[C:19]([S:21][CH3:22])[S:20][C:16]=2[CH:15]=1.O>CN(C=O)C>[N:1]1[C:5]2[C:4](=[N:9][CH:8]=[CH:7][CH:6]=2)[N:3]([CH2:13][C:14]2[CH:24]=[CH:23][C:17]3[N:18]=[C:19]([S:21][CH3:22])[S:20][C:16]=3[CH:15]=2)[CH:2]=1
To a stirred solution of 4-azabenzimidazole (613 mg, 5.15 mmol) in anhydrous DMF (20 mL) at 0° C. was added in one portion sodium hydride (60% dispersion in mineral oil, 216 mg, 5.41 mmol) and the mixture was stirred at 0° C. for 20 min. The mixture was allowed to warm to rt and stirred for a further 20 min. To the reaction mixture was added a solution of 6-(chloromethyl)-2-(methylthio)benzo[d]thiazole (1.3 g, 5.66 mmol) from Step 4 of Example 36 in DMF (5 mL). The mixture was stirred at rt for 15 h. To the reaction mixture was added water (300 mL) and the mixture was extracted with DCM (3×50 mL). The combined organic layers were washed with brine. The organic layer was separated, dried over MgSO4, filtered, and concentrated under reduced pressure. The residue was purified by silica gel flash chromatography (eluting with 100% DCM followed by 1% MeOH in DCM) to afford 6-((3H-imidazo[4,5-b]pyridin-3-yl)methyl)-2-(methylthio)benzo[d]thiazole (670 mg, 41%) as a white solid. The regiochemistry of the alkylation was determined by 2-dimensional nuclear Overhauser effect (NOE) experiment. 1H NMR (300 MHz, DMSO-d6) δ 8.65 (s, 1H), 8.38 (dd, J=1.3, 4.7 Hz, 1H), 8.11 (dd, J=1.2, 8.0 Hz, 1H), 8.00 (d, J=1.1 Hz, 1H), 7.81 (d, J=8.5 Hz, 1H), 7.46 (dd, J=1.6, 8.4 Hz, 1H), 7.30 (dd, J=4.7, 8.1 Hz, 1H), 5.62 (s, 2H), 2.77 (s, 3H). LCMS (ESI) m/z 313 (M+H)+.
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