反应详情

温度

90 °C

A mixture of 4-(benzyloxy)-N1-((2-(methylthio)benzo[d]thiazol-6-yl)methyl)benzene-1,2-diamine (2.49 g, 6.1 mmol) from the previous step, triethylorthoformate (60 mL), and formic acid (1.22 g) was stirred at 90° C. for 2 h. The reaction mixture was cooled to rt, and then concentrated under reduced pressure. The residue was purified by silica gel flash chromatography eluting with a gradient of 50% EtOAc in petroleum ether to 100% EtOAc to afford 6-((5-(benzyloxy)-1H-benzo[d]imidazol-1-yl)methyl)-2-(methylthio)benzo[d]thiazole (1.6 g, 62%) as a light yellow solid. 1H NMR (300 MHz, CDCl3) δ 7.93 (s, 1H), 7.82 (d, J=8.4 Hz, 1H), 7.50 (s, 1H), 7.44-7.49 (m, 2H), 7.30-7.40 (m, 4H), 7.26 (m, 1H), 7.13 (d, J=9.0 Hz, 1H), 6.98 (m, 1H), 5.41 (s, 2H), 5.10 (s, 2H), 2.77 (s, 3H); LCMS (ESI) m/z 418 (M+H)+.

1. temperatureThe reaction mixture was cooled to rt
2. concentrationconcentrated under reduced pressure
3. customThe residue was purified by silica gel flash chromatography
4. washeluting with a gradient of 50% EtOAc in petroleum ether to 100% EtOAc