反应详情

A solution of 4-methoxy-N1-((2-(methylthio)benzo[d]oxazol-6-yl)methyl)benzene-1,2-diamine (755 mg, 2.40 mmol) in triethoxymethane (8 mL) and HCOOH (0.2 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 1:2 petroleum ether/ethyl acetate to give 6-((5-methoxy-1H-benzo[d]imidazol-1-yl)methyl)-2-(methylthio)benzo[d]oxazole as a light brown solid (683 mg, 87.6%). 1H NMR (300 MHz, DMSO-d6) δ 8.36 (s, 1H), 7.66 (s, 1H), 7.58 (d, J=7.8 Hz, 1H), 7.43 (d, J=9.0 Hz, 1H), 7.30 (d, J=6.6 Hz, 1H), 7.16 (s, 1H), 6.82 (d, J=6.6 Hz, 1H), 5.54 (s, 2H), 3.75 (s, 3H), 2.73 (s, 3H). LCMS (ESI) m/z 326 (M+H)+.

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