反应详情

Intermediate 6a 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) (530 mg, 2.0 mmol) and 3-methoxy-benzohydrazide (329 mg, 2.0 mmol). After column chromatography (2% methanol/EtOAc) the title compound was isolated as a white solid (471 mg, 57%). 1H NMR (500 MHz, d6-acetone, δ in ppm) 9.88 (br s, 1H), 9.53 (br s, 1H), 7.47 (m, 3H), 7.38 (at, J=8.0 Hz, 1H), 7.12 (m, 1H), 6.66 (d, J=8.7 Hz, 1H), 5.55 (d, J=7.0 Hz, 1H), 4.88 (br s, 1H), 4.40 (m, 1H), 4.12 (dd, J=3.3, 7.0 Hz, 1H), 3.83 (s, 3H), 2.34 (s, 3H), 1.35 (d, J=6.3 Hz, 3H).

1. customIntermediate 6a was synthesized similarly to the procedure