111820-05-4Relevant articles and documents
Enzymatic conversion of unnatural amino acids by yeast D-amino acid oxidase
Caligiuri, Antonio,D'Arrigo, Paola,Rosini, Elena,Tessaro, Davide,Molla, Gianluca,Servi, Stefano,Pollegioni, Loredano
, p. 2183 - 2190 (2007/10/03)
Unnatural amino acids, particularly synthetic α-amino acids, are becoming crucial tools for modern drug discovery research. In particular, this application requires enantiomerically pure isomers. In this work we report on the resolution of racemic mixtures of the amino acids D,L-naphthylalanine and D,L-naphthylglycine by using a natural enzyme, D-amino acid oxidase from the yeast Rhodotorula gracilis. A significant improvement of the bioconversion is obtained using a single-point mutant enzyme designed by a rational approach. With this D-amino acid oxidase variant the complete resolution of all the unnatural amino acids tested was obtained: in this case, the bioconversion requires a shorter time and a lower amount of biocatalyst compared to the wild-type enzyme. The simultaneous production of the corresponding α-keto acid, a possible precursor of the amino acid in the L-form, improves the significance of the procedure.
An efficient synthesis of 1-naphthylbis(oxazoline) and exploration of the scope in asymmetric catalysis
Van Lingen, Hester L.,Van de Mortel, Jeroen K. W.,Hekking, Koen F. W.,Van Delft, Floris L.,Sonke, Theo,Rutjes, Floris P. J. T.
, p. 317 - 324 (2007/10/03)
Both enantiomers of 1-naphthylglycine were obtained in 99% ee by enzymatic resolution of the corresponding racemic amino acid amide, giving access to the novel ligands (R)- and (S)-naphthylbis(oxazoline). Initial studies provided insight into the scope an
An Efficient and Practical Synthesis of L-α-Amino Acids Using (R)-Phenylglycinol as a Chiral Auxiliary
Inaba, Takashi,Kozono, Ichiro,Fujita, Makoto,Ogura, Katsuyuki
, p. 2359 - 2365 (2007/10/02)
L-α-Amino acids including L-α-arylglycines were conveniently and stereoselectively synthesized via the α-amino carbonitriles given by the Strecker reaction of (R)-2-amino-2-phenylethanol with aldehydes and hydrogen cyanide.The stereoselectivity of these α-amino carbonitriles was thermodynamically controlled.