The efficient synthesis of substituted phenylalanine-type amino acids using a rhodium-catalysed, conjugate addition of arylboronic acids is described. The reactions are run in water and use a low loading (0.5 mol %) of rhodium catalyst.
Chapman, C. J., & Frost, C. G. (2003). Synthesis of functionalised phenylalanines using rhodium catalysis in water. Advanced Synthesis & Catalysis, 345(3), 353-355. https://doi.org/10.1002/adsc.200390039