反应详情

To a solution of 1-[4-bromo-2-(methoxymethyl)phenyl]-2-ethylpiperidine (1.42 g, 4.55 mmol) in anhydrous THF was added n-butyl lithium (2.4 mL, 6.82 mmol) in drops at −78° C. After 1 hour at −78° C., the reaction mixture was poured onto crushed dry-ice (100 g). Once the excess carbon dioxide was escaped, the reaction mixture was acidified with a 2N aqueous solution of HCl. The precipitate was filtered off and dried to afford the title compound as a solid (1.0 g, 70%). HPLC (Method A), Rt: 2.5 min (purity: 97.7%). LC/MS (Method A): 278.0 (M+H)+. 1H NMR (CD3OD, 400 MHz) δ 8.20 (1H, d), 8.07 (1H, s), 7.92 (1H, d), 5.05 (2H, m), 3.89 (1H, bs), 3.69 (4H, m), 2.39 (1H, d), 2.02-2.14 (2H, m), 1.72-1.95 (3H, m), 1.46 (2H, m), 0.88 (3H, t).

1. additionthe reaction mixture was poured
2. filtrationThe precipitate was filtered off
3. customdried