N-(5-fluoro-3-nitropyridin-2-yl)-N-((2-(methylthio)benzo[d]thiazol-6-yl)methyl)formamide → 6-((6-fluoro-3H-imidazo[4,5-b]pyridin-3-yl)methyl)-2-(methylthio)benzo[d]thiazole

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A stirred mixture of N-(5-fluoro-3-nitropyridin-2-yl)-N-((2-(methylthio)benzo[d]thiazol-6-yl)methyl)formamide and iron powder (6 g, 108 mmol) in EtOH (70 mL) and HOAc (30 mL) was heated at reflux for 2 h. The mixture was cooled to rt, filtered, and the filtrate was concentrated under reduced pressure. The residue was purified by silica gel flash chromatography, eluting with a gradient of 100% hexanes to 100% EtOAc, to afford 6-((6-fluoro-3H-imidazo[4,5-b]pyridin-3-yl)methyl)-2-(methylthio)benzo[d]thiazole (1 g, 28%) as a white foam. 1H NMR (500 MHz, DMSO-d6) δ 8.72 (s, 1H), 8.40 (t, J=2.0 Hz, 1H), 8.09 (dd, J=2.6, 9.5 Hz, 1H), 7.99 (s, 1H), 7.80 (d, J=8.4 Hz, 1H), 7.45 (dd, J=1.5, 8.4 Hz, 1H), 5.61 (s, 2H), 2.76 (s, 3H); LCMS (ESI) m/z 331 (M+H)+.

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