反应详情

A mixture of 4-(3-(2,3-dichlorobenzyl)-2-methyl-7-nitro-3H-benzo[d]imidazol-5-yl)morpholine (210 mg), iron powder (56 mg) and FeSO4 (152 mg) in ethanol (25 mL) and H2O (25 mL) was stirred at reflux temperature for 3 h. When TLC showed consumption of all starting material, the mixture was cooled to room temperature and filtered. The filtrate was concentrated in-vacuo and the residue was then purified by silica gel chromatography eluted with MeOH: DCM: NH3.H2O=1:60:0.5% to afford the desired product as a yellow solid (137 mg, 70%). 1H NMR (300 MHz, DMSO-d6) δ ppm 2.32 (s, 1H), 2.94 (t, 4H, J=4.8 Hz), 3.68 (t, 4H, J=4.8 Hz), 5.16 (br, s, 2H), 5.40 (s, 2H), 6.09 (d, 1H, J=1.8 Hz), 6.13 (d, 1H, J=1.8 Hz), 6.32 (dd, 1H, J=1.5, 7.5 Hz), 7.25 (t, 1H, J=7.5 Hz), 7.58 (dd, 1H, J=1.5, 7.5 Hz); LC-MS: m/e=391 [M+1]+.

1. temperatureat reflux temperature for 3 h
2. customconsumption of all starting material
3. filtrationfiltered
4. concentrationThe filtrate was concentrated in-vacuo
5. customthe residue was then purified by silica gel chromatography
6. washeluted with MeOH