反应详情

To a stirred solution of methyl 4-[1-(tert-butoxycarbonyl)-2-pyrrolidinyl]methoxy-3,5-dichlorobenzoate (988 mg, 3.248 mmol) in CH2Cl2 (20 mL) was added TFA (5 mL) at 0° C., and the reaction mixture was stirred at room temp for 2 hr. The solvent was removed under a reduced pressure and the residue was treated with 1 N NaOH. The solution was extracted with CHCl3. The extract was washed with brine, dried over Na2SO4, and concentrated under a reduced pressure to afford 672 mg (68%) methyl 3,5-dichloro-4-(2-pyrrolidinyl)methoxybenzoate as a pale yellowish oil. 1H-NMR (400 MHz, CDCl3) δ 1.62–1.69 (m, 1H), 1.78–1.86 (m, 2H), 1.89–1.99 (m, 1H), 2.92–2.98 (m, 1H), 3.04–3.09 (m, 1H), 3.55–3.60 (m, 1H), 3.91 (s, 3H), 4.01 (dd, J=6.8, 8.8 Hz, 1H), 4.08 (dd, J=4.9, 8.8 Hz, 1H), 7.97 (s, 2H); MS (FAB) m/z 304 (M++1).

1. customThe solvent was removed under a reduced pressure
2. additionthe residue was treated with 1 N NaOH
3. extractionThe solution was extracted with CHCl3
4. washThe extract was washed with brine
5. dry with materialdried over Na2SO4
6. concentrationconcentrated under a reduced pressure