* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
N-Cbz-ThrNH2 (504 g, 2 mol) was dissolved in methanol, followed by addition of 10percent of Pd/C(50.4 g, 10 wt percent), and the resulting suspension was stirred at room temperature under hydrogen(1.0 MPa) for 12 h. Pd/C was filtered and the filtrate was evaporated in vacuum to furnish the crudeproduct as yellowish oily liquid, which was redissolved in 3 L of acetone, followed by slow addition ofa solution of HCl in iPrOH (500 mL) at 0?5 °C under stirring. The precipitated white solid was filteredand dried under high vacuum (45 °C, 0.1 MPa) to afford 1b 289 g (93.5percent yield). 1H-NMR (400 MHz,D2O) delta 4.15 (p, J = 6.1 Hz, 1H), 3.86 (d, J = 5.2 Hz, 1H), 1.25 (d, J = 6.5 Hz, 3H). 13C-NMR (101 MHz,D2O) delta170.25, 66.04, 58.40, 18.80. HRMS (ESI-TOF+) m/z ([M + H]+), calcd. for C4H11N2O2 + H+:119.0815, found 119.0817.