This is very basic peptide chemistry.
D-Phenylalanine is boc'ed with Boc2O, neat as a melt, or reflux in CHCl3. Yield ~95%.
Now there are two ways to proceed. You can make the the unsymmetrical anhydride with Ethyl or Isobutyl Chloroformate, or the like, in DCM with Triethylamine. Or you can make the symmetrical anhydride with 0.5eq. Dicyclohexylcarbodiimide in DCM, filter off the urea bypropduct, and proceed with hydrogenation.
I would assume that Pd/C, or PtO2 would work in a situation like this. Maybe CTH can be applied here, if so, that would be wonderful.