1: 1.) Piv-Cl, pyridine 2.) citric acid / 1.) THF, -15 - 0 deg C, 1 h 5 min 2.) water 2: H2 / Pd/C / tetrahydrofuran; acetic acid View Scheme

pyridine; pivaloyl chloride; citric acid 1.) THF, -15 - 0 deg C, 1 h 5 min 2.) water; Yield given. Multistep reaction;