The Suzuki coupling with a protected L-tyrosine triflate, catalyzed by Tetrakis(triphenyl-phosphine)-palladium(0)-, occurred in high yield without racemization when anhydrous K2CO3 in toluene was used as the base: J. Org. Chem., 57, 379 (1992). For Ni-catalyzed coupling with allylamines, see: J. Chem. Soc., Perkin 1, 2083 (1995).