反应详情

温度

90 °C

A mixture of 4-bromo-N1-((2-(methylthio)benzo[d]oxazol-6-yl)methyl)benzene-1,2-diamine (465 mg, 2.40 mmol), triethyl orthoformate (3.8 mL), and HCOOH (0.06 mL) was stirred at 90° C. for 40 min. The reaction mixture was concentrated under reduced pressure. The residue was purified by silica gel chromatography eluting with 1:1 petroleum ether/ethyl acetate to give 6-((5-bromo-1H-benzo[d]imidazol-1-yl)methyl)-2-(methylthio)benzo[d]oxazole as a light brown solid (327 mg, 68.3%). 1H NMR (300 MHz, DMSO-d6) δ 8.50 (s, 1H), 7.85 (s, 1H), 7.68 (s, 1H), 7.55-7.60 (m, 2H), 7.30-7.37 (m, 2H), 5.60 (s, 2H), 2.73 (s, 3H). LCMS (ESI) m/z 375 (M+H)+.

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