How is N-[(Benzyloxy)carbonyl]-D-valine (CAS: 1685-33-2) typically synthesized?

N-[(Benzyloxy)carbonyl]-D-valine (CAS: 1685-33-2) can be synthesized using a multi-step process involving the protection of D-valine with benzyloxycarbonyl group. This typically involves the reaction of D-valine with phenyl methyl chloroformate in the presence of a base like triethylamine to form the protected amino acid. Further steps may include acetylation and deprotection to achieve the final product. The yield and selectivity can be improved by optimizing reaction conditions and using appropriate solvents and catalysts.