Fig. 5: Substrate scope exploration and X-ray crystal structures of the amino acids formed.

a Structures of the produced β-branched aromatic α-amino acids. Yields refer to the isolated product after purification. b X-ray crystal structures of products 4a, 5a, 8a and 9a. Different colors represent different atoms: gray for carbon atoms, cyan for hydrogen atoms, red for oxygen atoms, blue for nitrogen atoms, and green for fluorine atoms. Source data are provided in Source Data 5.