90376-98-0Relevant articles and documents
Synthesis of dipeptides containing α-substituted amino acids; their use as chiral ligands in Lewis-acid-catalyzed reactions
Kaptein, Bernard,Monaco, Vania,Broxterman, Quirinus B.,Schoemaker, Hans E.,Kamphuis, Johan
, p. 231 - 238 (2007/10/02)
L-α-Methylphenylalanine, obtained by enzymatic resolution of the corresponding racemic amide with amidase from Ochrobactrum anthropi NCIMB 40321, was used in the synthesis of dipeptides containing α-substituted amino acids.The 2-hydroxynaphthalene-1-carboxaldehyde Schiff bases of the dipeptides (1 and 2) were tested as Ti(IV) and Al(III) complexes in asymmetric Lewis-acid-catalyzed reactions.Only the Al(III) complex of 2 showed moderate enantioselectivity in the cyanation reaction of benzaldehyde with TMS-CN.
Synthesis of Optically Pure α-Alkylated α-Amino Acids and a Single-Step Method for Enatiomeric Excess Determination
Kruizinga, Wim H.,Bolster, John,Kellogg, Richard M.,Kamphuis, Johan,Boesten, Wilhelmus H. J.,et al.
, p. 1826 - 1827 (2007/10/02)
A method for the enzymatic resolution of the amides of some racemic α-alkylated amino acids is described as well as a method involving derivatization with (S)-2-chloropropionyl chloride followed by 1H NMR analysis to establish the enantiomeric excesses of the free amino acids.