反应详情

温度

23 °C

To a stirred solution of 5-{2-[2-(3-chloro-phenyl)-2-hydroxy-ethylamino]-propyl}-benzo[1,3]dioxole-2,2-dicarboxylic acid bis-isopropyl ester hydrochloride salt (3.0 g, 5.53 mmol) and 20 mL of i-PrOH was added was added 1N NaOH (11.1 mL, 11.1 mmol). After stirring at 23° C. for 3 days, the mixture was concentrated to dryness, dissolved in 10% MeOH/CH2Cl2, and filtered through a small pad of silica gel. The filtrate was concentrated to a colorless gum, and triturated with Et2O to give 1.0 g (39%) of 5-{2-[2-(3-chloro-phenyl)-2-hydroxy-ethylamino]-propyl}-benzo[1,3]dioxole-2,2-dicarboxylic acid isopropyl ester as a white solid; 1H NMR (300 MHz, CDCl3): δ 0.93 (d, J=6.1 Hz, 3H), 1.17 (d, J=6.3 Hz, 6H), 2.30-2.53 (m, 2H), 2.67-2.80 (m, 2H), 2.85-3.00 (m, 1H), 4.65-4.75 (brs, 1H), 4.91 (hept, J=6.3 Hz, 1H), 6.52-6.80 (complexm, 3H), 7.17-7.45 (complexm, 4H); MS (ES) m/z (relative intensity): 464 (M+, 100).

1. concentrationthe mixture was concentrated to dryness
2. dissolutiondissolved in 10% MeOH/CH2Cl2
3. filtrationfiltered through a small pad of silica gel
4. concentrationThe filtrate was concentrated to a colorless gum
5. customtriturated with Et2O