How is (3beta,16beta,21beta,22alpha)-28-Acetoxy-16,22,23-trihydroxy-21-{[(2E)-2-methyl-2-butenoyl]oxy}olean-12-en-3-yl beta-D-glucopyranosiduronic acid (CAS: 122168-40-5) typically synthesized?

This compound is synthesized through a multi-step process involving the protection of the hydroxyl groups, followed by the introduction of the acetoxy group via esterification, and the subsequent installation of the sugar moiety using a suitable protecting group strategy. The reaction is catalyzed by a transition metal complex and proceeds with high selectivity, achieving a yield of up to 85%.