The asymmetric synthesis of beta-substituted alpha-amino acids with use of iridium-catalyzedallylicsubstitution was described. The Ir-catalyzed allylicsubstitution of diphenylimino glycinate with allylic phosphates proceeded smoothly even at 0 degrees C and gave branch products with high enantioselectivity (up to 97% ee), when chiral bidentate phosphite bearing the 2-ethylthioethyl group was employed