Chemical deracemization and (S) to (R) interconversion of some fluorine-containing α-amino acids
摘要:
Several omega-CF3-substituted alpha-amino acids have been prepared in optically pure form via two complementary approaches. Racemic fluorinated derivatives of 2-aminobutanoic acid, norvaline and norleucine were chemically deracemized by complexation with a Ni(II) salt and a chiral reagent derived from alpha-(phenyl)ethylamine. Additionally this procedure also allowed the conversion of readily available L-amino acids, CF3-analogs of cysteine and methionine, into the corresponding unnatural D-series. Optically pure amino acids are obtained upon disassembly of the Ni(II) complexes with recovery of the chiral ligand. (C) 2013 Elsevier B.V. All rights reserved.
Chemical approach for interconversion of (S)- and (R)-α-amino acids
作者:Alexander E. Sorochinsky、Hisanori Ueki、José Luis Aceña、Trevor K. Ellis、Hiroki Moriwaki、Tatsunori Sato、Vadim A. Soloshonok
DOI:10.1039/c3ob40541a
日期:——
Here we report a general method for the preparation of unnatural (R)-α-amino acids via complexation of α-(phenyl)ethylamine derived chiral reagent (S)-3 with various (S)-α-amino acids. The reactions proceed with synthetically useful chemical yields and thermodynamically controlled diastereoselectivity. Chiral reagent (S)-3 can be conveniently recovered and reused without any loss of enantiomeric purity
Chemical deracemization and (S) to (R) interconversion of some fluorine-containing α-amino acids
作者:Alexander E. Sorochinsky、Hisanori Ueki、José Luis Aceña、Trevor K. Ellis、Hiroki Moriwaki、Tatsunori Sato、Vadim A. Soloshonok
DOI:10.1016/j.jfluchem.2013.02.022
日期:2013.8
Several omega-CF3-substituted alpha-amino acids have been prepared in optically pure form via two complementary approaches. Racemic fluorinated derivatives of 2-aminobutanoic acid, norvaline and norleucine were chemically deracemized by complexation with a Ni(II) salt and a chiral reagent derived from alpha-(phenyl)ethylamine. Additionally this procedure also allowed the conversion of readily available L-amino acids, CF3-analogs of cysteine and methionine, into the corresponding unnatural D-series. Optically pure amino acids are obtained upon disassembly of the Ni(II) complexes with recovery of the chiral ligand. (C) 2013 Elsevier B.V. All rights reserved.