反应详情

A mixture of benzil (1.05 g, 5.0 mmol) and 2-guanidinobenzimidazole (1.57 g, 9.0 mmol) in benzene (25 mL) was refluxed in pyridine (10 mL) for 1 h. After evaporating most of the pyridine under reduced pressure, the residue was treated with hot toluene and the resulting precipitate was filtered. The precipitate was then dissolved in 9:1 water:acetic acid (30 mL); the solution was filtered and the filtrate was neutralized to pH 7 with phosphate buffer. A precipitate formed, that was then collected and triturated with water to afford the title compound (0.42 g, 16%). 1H NMR (300 MHz, d6-DMSO) d 11.5 (br s, NH, 2 H), 10.0 (br s, NH, 2 H), 8.6 (br s, NH, 2 H), 7.28-7.10 (m, 14 H), 6.97 (dd, J=6.0, 3.0 Hz, 4 H); MS (ESI) m/z 525 [M+H]+; Anal. Calcd. for C30H24N10 . ½CH3CO2H ¾H2O: C, 65.37; H, 4.88; N, 24.65. Found: C, 65.36; H, 4.79; N, 24.48.

1. customAfter evaporating most of the pyridine under reduced pressure
2. additionthe residue was treated with hot toluene
3. filtrationthe resulting precipitate was filtered
4. dissolutionThe precipitate was then dissolved in 9:1 water
5. filtrationthe solution was filtered
6. customA precipitate formed
7. customthat was then collected
8. customtriturated with water