反应详情

A solution of (R)-3-[N′-t-butoxycarbonyl-N-(5′-chloro-2′-fluorobiphenyl-4-ylmethyl)hydrazino]-2-hydroxypropionic acid methyl ester (20 g, 16 mmol) in HCl/EtOH (1.1 M, 200 mL) was stirred overnight and then concentrated in vacuo. The residue was dispersed in EtOAc (2×40 mL), and the precipitate was collected by filtration to give the title compound as an off-white solid HCl salt (8.8 g). LC-MS: 367 [M+H]+. 1H NMR (300 MHz, DMSO-d6) δ 1.05 (t, J=7.2 Hz, 3H), 3.05-3.03 (q, J=7.2 Hz, 2H), 4.06-3.95 (m, 4H), 4.42 (br, 1H), 6.46 (br, 1H), 7.62-7.40 (m, 7H), 9.42 (s, 3H).

1. concentrationconcentrated in vacuo
2. additionThe residue was dispersed in EtOAc (2×40 mL)
3. filtrationthe precipitate was collected by filtration