Efficient Diastereoselective Synthesis of (2<i>R</i>,3<i>R</i>,4<i>R</i>)-2-Amino-3-hydroxy-4,5-dimethylhexanoic Acid, the Lactone Linkage Unit of Homophymine A
For the totalsynthesis of novelcyclodepsipeptide homophymine A, (2R,3R,4R)-2-amino-3-hydroxy-4,5-dimethylhexanoic acid was successfully synthesized by Evans' asymmetric alkylation and the anti-selective asymmetric hydrogenation of a chiral α-amino-β-keto ester as the key steps.