反应详情

To a solution of tert-butyl 3-(4-cyano-3-methylphenyl)acrylate obtained in step 1, (5.3 g) in ethyl acetate (50 mL) was added palladium on carbon (500 mg) and the mixture was placed under a pressure of 3 kg of hydrogen for 3 h at RT. The catalyst was removed by filtration and the filtrate was concentrated under vacuum to afford the title compound as white solid (5.2 g, 98%). 1H-NMR (CDCl3, 400 MHz) δ 7.51-7.53 (1H, d), 7.16 (1H, s), 7.10-7.12 (1H, d), 2.91-2.94 (2H, t), 2.53-2.57 (2H, t), 2.52 (3H, s), 1.42 (9H, s). LC/MS: 246.0 (M+H)+. HPLC (Method C) Rt 3.23 min (Purity: 96.2%).

1. customThe catalyst was removed by filtration
2. concentrationthe filtrate was concentrated under vacuum