反应详情

Tetrachlorotitanium (16.85 mL of 1 M, 16.85 mmol) in dichloromethane was added to a solution of ethyl 4-acetylbenzoate (5.4 g, 28.09 mmol) and isopropyl amine (6.644 g, 9.657 mL, 112.4 mmol) in diethyl ether (100 mL) at 0° C. and the reaction mixture allowed to warm to ambient temperature over 15 hours. The reaction mixture was poured into a biphasic mixture of aqueous 0.5 M sodium hydroxide and diethyl ether (4:1, 150 mL) and the layers separated. The aqueous phase was extracted with diethyl ether (×2) and the combined organic phases dried (MgSO4/K2CO3 10:1), filtered and concentrated in vacuo to give ethyl 4-(1-(isopropylimino)ethyl)benzoate as a pale yellow oil (6.7 g, quantitative). 1H NMR (400.0 MHz, DMSO-d6) δ 1.15 (d, J=6.3 Hz, 6H), 1.33 (t, J=7.2 Hz, 3H), 2.25 (s, 3H), 3.88 (sept, 1H), 4.33 (q, J=7.1 Hz, 2H) and 7.91-7.97 (m, 4H) ppm; LC/MS m/z 234.2 [M+H]+.

1. customthe layers separated
2. extractionThe aqueous phase was extracted with diethyl ether (×2)
3. dry with materialthe combined organic phases dried (MgSO4/K2CO3 10:1)
4. filtrationfiltered
5. concentrationconcentrated in vacuo