[2'-(Amino-κN)[1,1'-biphenyl]-2-yl-κC][[3,6-dimethoxy-2',4',6'-tris(1-methylethyl)[1,1'-biphenyl]-2-yl]bis(1,1-dimethylethyl)phosphine-κP](methanesulfonato-κO)palladium (tBuBrettPhos Pd G3) acts as a reagent in the arylation of amino acid esters with aryl triflates.