反应详情

To 1-[2-chloro-5-(methyloxy)-4-nitrophenyl]-4-[2-(methylsulfonyl)ethyl]piperazine (1.38 g, 3.65 mmol) in EtOH (30 mL) was added EtOAc to help with solubility. The catalyst, 5% sulfided platinum on carbon (0.138 g, 0.035 mmol) was added. The reaction was placed on a Fischer-Porter Hydrogenator under 50 psi of H2 gas and was allowed to stir at rt overnight. The catalyst was filtered off and the filtrate was concentrated in vacuo, adsorbed onto silica gel and flash chromatographed. The desired fractions were combined and concentrated to give the title compound of step B (0.880 g, 69%). 1H NMR (400 MHz, DMSO-d6) δ ppm 6.58-6.70 (m, 2H), 4.64 (s, 2H), 3.74 (s, 3H), 3.22-3.37 (m, 2H), 3.04 (s, 3H), 2.84 (t, J=4.4 Hz, 4H), 2.74 (t, J=6.7 Hz, 2H), 2.50-2.63 (m, 4H).

1. filtrationThe catalyst was filtered off
2. concentrationthe filtrate was concentrated in vacuo
3. customchromatographed
4. concentrationconcentrated