[NH2:1][C@H:2]([C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][C:8]=1[CH3:13])[CH2:3][C:4]([OH:6])=[O:5].[CH2:14](O)[CH3:15].S(Cl)([Cl:19])=O>CC1CCCO1>[NH2:1][C@H:2]([C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][C:8]=1[CH3:13])[CH2:3][C:4]([O:6][CH2:14][CH3:15])=[O:5].[ClH:19].[NH2:1][C@H:2]([C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][C:8]=1[CH3:13])[CH2:3][C:4]([O:6][CH2:14][CH3:15])=[O:5].[CH3:12][CH:7]1[CH2:2][CH2:3][CH2:4][O:5]1(S)-3-Amino-3-(2-methyl-phenyl)propionic acid (10.0 g, 55.8 mmol) was suspended in 2-methyltetrahydrofuran (100 ml) and ethanol (25.7 g, 558 mmol) was added. The mixture was heated to 80° C. and thionyl chloride (6.64 g, 55.8 mmol) was added slowly. After 2 h at 80° C. the solvents were almost completely removed by distillation. After cooling the mixture was stirred at room temperature for 16 h. Then more solvent was removed under reduced pressure to give the title compound in the form of ethyl (S)-3-amino-3-(2-methyl-phenyl)-propionate hydrochloride together with some 2-methyltetrahydrofuran in quantitative yield.
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