Akihiro Okada, Tomoyuki Shibuguchi, Takashi Ohshima,* Hyuma Masu, Kentaro Yamaguchi, and Masakatsu Shibasaki* α, β-Diamino acids are key structural components in molecules such as peptides and β-lactam antibiotics and in medicinally relevant compounds;[1, 2] for example, 2, 3-diamino-3-phenylpropanoic acid is used as an advanced alternative to the side chain of taxol to improve its water solubility.[3]