反应详情

A solution of 402 mg (1.65 mmol) of 2-(4-nitro-phenyl)-ethanesulfonic acid methylamide (as prepared in the previous step) in MeOH (30 mL) was hydrogenated over 10% Pd/C (Degussa type E101-NE/W, Aldrich, 50% by weight water) at 20 psi of H2 for 19 h. The reaction mixture was filtered through Celite, and the filter cake was washed with MeOH. Solvents were evaporated in vacuo. Silica gel chromatography of the residue on a 25-g Varian MegaBond Elut SPE column with 50% EtOAc-hexane afforded 318 mg (90%) of the title compound as a white solid: 1H-NMR (CD3CN; 400 MHz): δ 7.01 (d, 2H, J=8.4 Hz), 6.61 (d, 2H, J=8.4 Hz), 5.00-4.92 (br s, 1H), 4.12-4.02 (br s, 2H), 3.24-3.17 (m, 2H), 2.92-2.86 (m, 2H), 2.67 (s, 3H, J=5.2 Hz).

1. filtrationThe reaction mixture was filtered through Celite
2. washthe filter cake was washed with MeOH
3. customSolvents were evaporated in vacuo