反应详情

Intermediate 7a was synthesized similarly to the procedure outlined for intermediate 1b described above using (2R,3S)-2-(3-chloro-4-cyano-2-methylphenylamino)-3-hydroxybutanoic acid (intermediate 1a) (522 mg, 1.9 mmol) and 3-hydroxy-benzohydrazide (296 mg, 1.9 mmol). After column chromatography (EtOAc), the title compound was isolated as a white solid (407 mg, 52%). 1H NMR (400 MHz, acetone-d6, δ in ppm) δ 9.80 (br s, 1H), 9.52 (br s, 1H), 8.76 (br s, 1H), 7.49 (d, J=8.7 Hz, 1H), 7.40 (m, 1H), 7.29 (at, J=8.1 Hz, 1H), 7.04 (m, 1H), 6.66 (d, J=8.7 Hz, 1H), 5.55 (d, J=7.1 Hz, 1H), 4.89 (br s, 1H), 4.39 (m, 1H), 4.11 (dd, J=3.3, 7.0 Hz, 1H), 2.35 (s, 3H), 1.34 (d, J=6.5 Hz, 3H).

1. customIntermediate 7a was synthesized similarly to the procedure