An Efficient Access to Conformationally Rigid Amino Acid Analogues with a Piperidine Skeleton

[摘要]：Two unnatural conformationally constrained cyclic amino acid derivatives with the piperidine skeleton were synthesized in enantiomerically pure forms. The key step in the synthesis of these amino acids is the highly diastereoselective functionalization of the oxo group in a 4-oxo-pipecolic acid derivative.

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