反应详情

To a solution of 2-(4-chloro-3-methoxyphenyl)-2-methylpropanoic acid (15) (268 g, 1.17 mol) in CH2Cl2 (1.7 L) was added N,O-dimethylhydroxylamine hydrochloride (137 g, 1.4 mol), EDCl (270 g, 1.4 mol), and DMAP (172 g, 1.4 mol ). The resulting mixture was stirred for 3 h and washed with 10% citric acid solution (1.5 L), satd NaHCO3 (1.5 L), and brine(1.5 L) successfully. The organic phase was dried over MgSO4, filtered, and concentrated at reduced pressure to afford 2-(4-chloro-3-methoxyphenyl)-N-methoxy-N,2-dimethylpropanamide (16) as a brown solid (276 g, 96%). 1H NMR (400 MHz, CDCl3): δ 7.30-7.32 (d, 1H), 6.81-6.84 (m, 3H), 3.89 (s, 3H), 3.12 (s, 3H), 2.78 (s, 3H), 1.53 (s, 6H).

1. washwashed with 10% citric acid solution (1.5 L), satd NaHCO3 (1.5 L), and brine(1.5 L) successfully
2. dry with materialThe organic phase was dried over MgSO4
3. filtrationfiltered
4. concentrationconcentrated at reduced pressure