反应详情

Intermediate tert-butyl 2-amino-3-(4-methoxyphenyl)-2-methylpropanoate (0.60 g, 2.26 mmol) was mixed with toluene (6 mL) and a 5-6 N HCl solution in IPA (2 mL). A clear yellow solution was heated to reflux and kept at that temperature for 7 h. The resulting slurry was cooled to ambient temperature and filtered. The solid was washed with toluene (3 mL) on a filter and air-dried to afford 2-amino-3-(4-methoxyphenyl)-2-methylpropanoic acid hydrochloride [0.37 g; 67%] as a white solid [HPLC 71.8% (AUC; tR=3.71]. 1H NMR (500 MHz, DMSO-d6): δ 13.96 (br. s, 1H, COOH), 8.44 (br. s, 3H, NH3), 7.16 (d, J=8.7 Hz, 2H, Ar), 6.90 (d, J=8.7 Hz, 2H, Ar), 3.74 (s, 3H, CH3), 3.08 (s, 2H, CH2), 1.48 (s, 3H, CH3). Optical rotation (α25D, DMSO, c=1.10)+7.27°.

1. temperatureA clear yellow solution was heated
2. temperatureto reflux
3. filtrationfiltered
4. washThe solid was washed with toluene (3 mL) on
5. filtrationa filter
6. customair-dried