(R)-2-(Boc-amino)butyric acid is used in coupling reaction. Also used in preparation of dyes.
Yoo Lim Kam,; Hee-Kyung Rhee,; Hyewhon Rhim,; Seung Keun Back,; Heung Sik Na,; Hea-Young Park Choo. Synthesis and T-type calcium channel blocking activity of novel diphenylpiperazine compounds, and evaluation of in vivo analgesic activity. Bioorganic & Medicinal Chemistry. 2010, 18 (16), 5938-5944.