反应详情

Lithium hydroxide solution (1M in water, 90 mL, 90 mmol) was added to a solution of methyl[3-((2R)-2-{[(1R)-1-phenyl-ethyl]-amino}-propyl)-phenyl]-acetate hydrochloride (preparation 26), (13.5 g, 43.5 mmol) in methanol (200 mL) and the mixture was stirred at room temperature for 18 hours. 1M Hydrochloric acid (90 mL) was then added to the reaction mixture and the methanol removed in vacuo. The resulting precipitate was filtered off and washed with water (20 mL) and a mixture of ethanol/diethyl ether, 20:80, to afford the title compound as a solid in 91% yield, 11.8 g 1H NMR (400 MHz, CD3OD) δ: 7.52-7.45 (5H, m), 7.22-7.18 (2H, m), 7.19 (1H, s), 6.92 (1H, d), 4.56-4.48 (1H, q), 3.46 (2H, s), 3.26-3.13 (2H, m), 2.66-2.62 (1H, m), 1.62 (3H, d), 1.16 (3H, d) ppm; LRMS ESI m/z 298 [M+H]+

1. customthe methanol removed in vacuo
2. filtrationThe resulting precipitate was filtered off
3. washwashed with water (20 mL)
4. additiona mixture of ethanol/diethyl ether, 20:80