反应详情

A solution of tert-butyl 4-(4-nitrophenyl)-5,6-dihydropyridine-1(2H)-carboxylate (I43) (0.570 g, 1.87 mmol) in EtOH (5 mL) and DMF (5 mL) was added to a solution of 10% Pd/C (200 mg) in DMF (10 mL). The reaction was stirred at room temperature for 24 hours under an atmosphere of hydrogen. The reaction was filtered through a pad of celite and washed through with EtOAc (130 mL). The solvent was removed in vacuo to yield a brown oil which was purified by column chromatography on silica gel (0-50% EtOAc in petroleum benzine 40-60° C.) to afford the title compound (I44) (0.46 g, 89%) as a crystalline solid; 1H NMR (400 MHz, CDCl3) δ 7.02-6.96 (m, 2H), 6.67-6.61 (m, 2H), 4.21 (bs, 2H), 3.57 (s, 2H), 2.77 (t, J=12.2 Hz, 2H), 2.53 (tt, J12.1, 3.5 Hz, 1H), 1.77 (d, J=13.3 Hz, 2H), 1.64-1.50 (m, peak obscured by solvent), 1.48 (s, 9H). LCMS Method C: rt 4.77 min; m/z 221 [M−tButyl+2H]+, 177 [M-Boc+2H]+.

1. filtrationThe reaction was filtered through a pad of celite
2. washwashed through with EtOAc (130 mL)
3. customThe solvent was removed in vacuo
4. customto yield a brown oil which
5. customwas purified by column chromatography on silica gel (0-50% EtOAc in petroleum benzine 40-60° C.)