How is O-Benzyl-N-{[(2-methyl-2-propanyl)oxy]carbonyl}-D-tyrosine (CAS: 63769-58-4) typically synthesized?

O-Benzyl-N-{[(2-methyl-2-propanyl)oxy]carbonyl}-D-tyrosine is synthesized via a multi-step process involving the protection of tyrosine, introduction of the benzylic group, and subsequent deprotection. Commonly, this is achieved using protecting groups like methyl thioacetate, followed by conversion to the desired product under mild conditions. The reaction typically yields 70-80% purity with high selectivity.