反应详情

A mixture of Example Y (13 g, 53.3 mmol) and 4,4-dimethyl-3-oxo-pentanenitrile (6.9 g, 55 mol) in ethanol (150 mL) was heated to reflux overnight. The reaction solution was evaporated under reduced pressure. The residue was purified by column chromatography to give 3-[3-(5-amino-3-t-butyl-pyrazol-1-yl)-phenyl]-propionic acid ethyl ester (14.3 g, 45.4 mmol) as a white solid. 1H NMR (DMSO-d6): 7.39-7.32 (m, 3H), 7.11 (d, J=6.8 Hz, 1H), 5.34 (s, 1H), 5.16 (s, 2H), 4.03 (q, J=7.2 Hz, 2H), 2.88 (t, J=7.6 Hz, 2H), 2.63 (t, J=7.6 Hz, 2H), 1.19 (s, 9H), 1.15 (t, J=7.2 Hz, 3H).

1. temperatureto reflux overnight
2. customThe reaction solution was evaporated under reduced pressure
3. customThe residue was purified by column chromatography