Takeda R, Kawamura A, Kawashima A, Sato T, Moriwaki H, Izawa K, Akaji K, Wang S, Liu H, Aceña JL, Soloshonok VA. Chemical dynamic kinetic resolution and S/R interconversion of unprotected α-amino acids.
Angew Chem Int Ed Engl 2014;
53:12214-7. [PMID:
25244328 DOI:
10.1002/anie.201407944]
[Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2014] [Indexed: 12/17/2022]
Abstract
Reported herein is the first purely chemical method for the dynamic kinetic resolution (DKR) of unprotected racemic α-amino acids (α-AAs), a method which can rival the economic efficiency of the enzymatic reactions. The DKR reaction principle can be readily applied for S/R interconversions of α-AAs, the methodological versatility of which is unmatched by biocatalytic approaches. The presented process features a virtually complete stereochemical outcome, fully recyclable source of chirality, and operationally simple and convenient reaction conditions, thus allowing its ready scalability. A quite unique and novel mode of the thermodynamic control over the stereochemical outcome, including an exciting interplay between axial, helical, and central elements of chirality is proposed.
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