Syntheses of N-Boc (S)-4-(diethylphosphono)-(α-methyl) phenylalanine [Boc-(α-Me) Phe (4- PO3Et2)-OH]() and N-Boc (S)-2-amino-6-(diethylphosphono) tetralin-2-carboxylic acid [Boc- Atc (6-PO3Et2)-OH]() are reported as conformationally-constrained phosphotyrosyl mimetics suitably protected for peptide synthesis. Both syntheses proceeded through chiral arylhalides that are converted to arylphosphonates by palladium-catalyzed cross coupling ...