反应详情

To a suspension of 1-(thiazol-2-ylaminosulphonyl )-3-nitrobenzene (0.5 g, 1.8 mmol) in ethanol (50 ml) was added 10% palladium on carbon. (0.25 g, 50% (w/w)) in water (2 ml) and 5M hydrochloric acid (1 ml, 5 mmol). The mixture was hydrogenated at 45 psi for 3 h. The catalyst was filtered off and washed with ethanol. The solvents were evaporated in vacuo and the residue chromatographed on silica gel using 10% methanol in dichloromethane as the eluant to afford the product (0.34 g, 76%) as a pale yellow solid. mp 187°-190° C. 1H NMR (360 MHz, D6 -DMSO) δ 5.49 (2H, brs), 6.66-6.73 (1H, m), 6.80 (1H, d, J=4.6 Hz), 6.85-6.90 (1H, m), 6.98-7.02 (1H, m), 7.11 (1H, dd, J=7.9 and 7.9 Hz), 7.22 (1H, d, J=4.7 Hz), 12.59 (1H, brs).

1. filtrationThe catalyst was filtered off
2. washwashed with ethanol
3. customThe solvents were evaporated in vacuo
4. customthe residue chromatographed on silica gel using 10% methanol in dichloromethane as the eluant