反应详情

To a stirred mixture of 4-bromo-5-methoxy-N1-((2-(methylthio)benzo[d]thiazol-6-yl)methyl)benzene-1,2-diamine (120 mg, 0.3 mmol) from Step 2 of this Example and triethylorthoformate (20 mL) was added formic acid (1 mL). The mixture was heated under reflux for 2 h, then concentrated under reduced pressure. The residue was purified by silica gel flash chromatography eluting with 100% EtOAc to afford 6-((5-bromo-6-methoxy-1H-benzo[d]imidazol-1-yl)methyl)-2-(methylthio)benzo[d]thiazole (50 mg, 40%) as an oil. 1H NMR (300 MHz, CDCl3) δ 8.01 (s, 1H), 7.78-7.91 (m, 2H), 7.46 (s, 1H), 7.25 (m, 1H), 6.69 (s, 1H), 5.42 (s, 2H), 3.81 (s, 3H), 2.78 (s, 3H). LCMS (ESI) m/z 420 and 422 (M+H)+.

1. temperatureThe mixture was heated
2. temperatureunder reflux for 2 h
3. concentrationconcentrated under reduced pressure
4. customThe residue was purified by silica gel flash chromatography
5. washeluting with 100% EtOAc