反应详情

To a solution of tert-butyl 2-(2-(4-chloro-3-methoxyphenyl)-2-methylpropanoyl)hydrazine carboxylate (12.63 g, 0.04 mol) in EtOAc (100 mL) at 0° C. was added 2M HCl in Et2O (92 mL). The resulting solution was stirred at room temperature 18 h and concentrated in vacuo. The residue was triturated with Et2O, collected by filtration and dried to give 2-(4-chloro-3-methoxyphenyl)-2-methylpropanehydrazide hydrochloride (6.88 g, 67%) as a white solid. 1H NMR (400 MHz, DMSO) δ 11.64 (s, 1H), 7.41-7.39 (d, 1H), 7.01 (s, 1H), 6.92-6.89 (d, 1H), 3.91 (s, 3H), 1.53 (s, 6H).

1. concentrationconcentrated in vacuo
2. customThe residue was triturated with Et2O
3. filtrationcollected by filtration
4. customdried