反应详情

温度

80 °C

To a solution of 1-tert-butyl 4,4-dimethyl piperidine-1,4,4-tricarboxylate (6.2 g, 20.5 mmol) in THF (11 mL) and CH3OH (11 mL) was added aqueous LiOH (2 N, 11 mL, 22 mmol, 1.1 equiv.). The reaction mixture was stirred at 80° C. for 1 h. The reaction mixture was neutralized with HCl (1N) and was concentrated to dryness. The residue was dissolved in ethyl acetate and dried over Na2SO4 and concentrated to give 1-(tert-butoxycarbonyl)-4-(methoxycarbonyl)piperidine-4-carboxylic acid (4.7 g, 80%), which was used without further purification. LRMS (M+H+-Boc) m/z 188.0.

1. concentrationwas concentrated to dryness
2. dissolutionThe residue was dissolved in ethyl acetate
3. dry with materialdried over Na2SO4
4. concentrationconcentrated