Shu S, Zhao L, Zhou S, Wu C, Liu H, Wang J. Recyclable and Stable
α-Methylproline-Derived Chiral Ligands for the Chemical Dynamic Kinetic Resolution of free
C,N-Unprotected
α-Amino Acids.
Molecules 2019;
24:E2218. [PMID:
31200582 PMCID:
PMC6630268 DOI:
10.3390/molecules24122218]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Revised: 06/06/2019] [Accepted: 06/06/2019] [Indexed: 11/16/2022] Open
Abstract
A novel special designed, stable, and recyclable chiral ligand bearing a quaternary carbon was developed for chemical dynamic kinetic resolution (DKR) of free C,N-unprotected racemic α-amino acids via Schiff base intermediates. This method furnishes high yields with excellent enantioselectivity, has a broad substrate scope, and uses operationally simple and convenient conditions. The present chemical DKR is a practical and useful method for the preparation of enantiopure α-amino acids.
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