N-Boc-L-proline methyl ester is generally used as a intermediate in pharmaceutical and chemical research.
Shigeyuki Yoshifuji; Ken-Ichi Tanaka; Tomoyuki Kawai; Yoshihiro Nitta. A Novel Synthesis of L-Pyroglutamic Acid Derivatives from L-Proline : Utility of N-Protecting Groups for Ruthenium Tetroxide Oxidation of Cyclic α-Amino Acids. Chemical and Pharmaceutical Bulletin. 1986, 34 (9), 3873-3878.