N-Boc-O-tert-butyl-L-tyrosine is used as pharmaceutical intermediate.
V. F. Pozdnev; M. Yu. Chernaya. Activation of a carboxy group by dialkyl pyrocarbonates. Synthesis of symmetrical anhydrides and aryl esters of N-protected amino acids using di-tert-butyl pyrocarbonate as condensing reagent. Chemistry of Natural Compounds. 1984, 20 (3) 333-337.
Xiaorui Wang; Jinming Hu; Guoying Zhang and Shiyong Liu. Highly Selective Fluorogenic Multianalyte Biosensors Constructed via Enzyme-Catalyzed Coupling and Aggregation-Induced Emission. J. Am. Chem. Soc. 2014, 136 (28), 9890-9893.