反应详情

温度

90 °C

A mixture of N2-((2-(methylthio)benzo[d]thiazol-6-yl)methyl)-5-(trifluoromethyl)pyridine-2,3-diamine (0.89 g, 2.39 mmol), triethoxymethane (30 mL) and HCOOH (0.6 g) was stirred at 90° C. for 2 h. The mixture was concentrated under reduced pressure. The residue was purified by silica gel chromatography eluting with 2:1 to 0:1 petroleum ether/EtOAc to afford 2-(methylthio)-6-((6-(trifluoromethyl)-3H-imidazo[4,5-b]pyridin-3-yl)methyl)benzo[d]thiazole as a light yellow solid (0.77 g, 79.3%). 1H NMR (300 MHz, DMSO-d6) δ 8.88 (s, 1H), 8.77 (d, J=1.2 Hz, 1H), 8.57 (d, J=1.8 Hz, 1H), 8.00 (d, J=1.2 Hz, 1H), 7.81 (d, J=8.4 Hz, 1H), 7.49-7.46 (m, 1H), 5.68 (s, 2H), 2.77 (s, 3H). LCMS (ESI) m/z 381 (M+H)+.

1. concentrationThe mixture was concentrated under reduced pressure
2. customThe residue was purified by silica gel chromatography
3. washeluting with 2:1 to 0:1 petroleum ether/EtOAc