Stereocontrolled Synthesis of Unnatural Tetrapeptides Containing L-Valine Units

[摘要]：The stereoselective synthesis of the new nonproteinogenic branched tetrapeptides 9a-9d and 15a,b, containing two L-valine units and unnatural alpha-amino acids, was accomplished starting from the chiral synthon 1a, a monolactim ether easily obtained from L-valine.

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