反应详情

2-(3,4-Dichlorophenyl)-5-((E)-2-nitrovinyl)furan (5.73 g, 20.2 mmol) was dissolved into the mixture of dry methanol (90 ml) and dry ethyl acetate (70 ml). Then, 14.3 ml of 10 w-% HCl-methanol and 2.4 g of 10% palladium on carbon were added. 2-(3,4-Dichlorophenyl)-5-((E)-2-nitrovinyl)furan was hydrogenated at 3 atm at RT for about 4 h. The catalyst was removed by filtrating through Celite®. Removal of solvent under reduced pressure gave a raw product which was purified by flash chromatography on silica gel using CH2Cl2/MeOH (98:2-80:20) as a gradient eluent. 1H NMR (400 MHz, DMSO-d6): 3.04 (2H, m), 3.14 (2H, m), 6.43 (1H, d), 7.07 (1H, d), 7.67 (2H, s), 7.93 (1H, s), 8.19 (3H, broad s).

1. customThe catalyst was removed
2. filtrationby filtrating through Celite®
3. customRemoval of solvent under reduced pressure