How is (2S,3R)-2-{[(benzyloxy)carbonyl]amino}-3-hydroxybutanoic acid (CAS: 19728-63-3) typically synthesized?

(2S,3R)-2-{[(Benzyloxy)carbonyl]amino}-3-hydroxybutanoic acid can be synthesized via a multi-step process involving the protection of the amino group, followed by amidation and subsequent deprotection. Common starting materials include benzyloxycarbonyl chloride and 3-amino-2-hydroxybutanoic acid. The reaction typically involves the use of triethylamine as a base and is conducted under mild conditions to achieve high yield and selectivity.