How is Pentafluorophenyl N-[(9H-fluoren-9-ylmethoxy)carbonyl]-D-alaninate (CAS: 125043-04-1) typically synthesized?

Pentafluorophenyl N-[(9H-fluoren-9-ylmethoxy)carbonyl]-D-alaninate is typically synthesized through a multi-step process involving the coupling of a D-alanine derivative with a fluorenylmethoxycarbonyl chloride, followed by protection and deprotection steps. The synthesis often requires mild conditions and appropriate solvents to achieve high yield and selectivity.