147383-98-0Relevant academic research and scientific papers
One-pot, regioselective synthesis of substituted arylglycines for kinetic resolution by penicillin G acylase
Grundmann, Peter,Fessner, Wolf-Dieter
experimental part, p. 1729 - 1735 (2009/07/24)
Amido-alkylation of electron-rich arenes with phenylacetamide and glyoxylic acid offers an in-expensive route to a large variety of N-phenylacetylated arylglycines that are suited for immediate enzymatic resolution by penicillin G acylase. When performed under mild conditions at 5 °C in acetic acid/HCl, this simple one-pot operation resulted in the formation of single regioisomers only (≥98%). Subsequent kinetic resolution of the amino acid derivatives by penicillin G acylase at pH 8.0 occurred generally with E values >100 and thus furnished free (S)-configurated arylglycines with high enantiomeric purity. The corresponding enantiopure (R)-substrates, easily separable by a phase-selective extraction process, provided the corresponding (R)-enantiomers upon conventional hydrolysis. This one-pot, two-step procedure for arylglycine synthesis, resolution and work-up requires a minimum of equipment and grants rapid access to both enantiopure (S)- and (R)-antipodes of non-natural α-amino acids in small-to large-scale quantities.
Asymmetric synthesis of arylglycines and their use as chiral templates for the stereocontrolled synthesis of 7,8-disubstituted 3-Aryl-1,2,3,4-tetrahydroisoquinolin-4-ols
Anakabe, Eneritz,Vicario, Jose L.,Badia, Dolores,Carrillo, Luisa,Yoldi, Victoria
, p. 4343 - 4352 (2007/10/03)
A synthetic technique for the asymmetric synthesis of arylglycines has been optimized, reaching the target amino acids in only four steps with good yields and with enantiomeric excesses higher than 99%. The key step consisted of a stereocontrolled electrophilic amination reaction of (S,S)-(+)-pseudoephedrine-based arylacetamide enolates with di-tertbutylazodicarboxylate. The arylglycines thus obtained turned out to be excellent chiral templates for the production of chiral, nonracemic 7,8-disubstituted 3-aryl-1,2,3,4-tetrahydroisoquinolines, through use of a synthetic sequence involving: (1) reduction of the arylglycines to the parent arylglycinols, (2) N-benzylation with appropriately substituted aromatic aldehydes and (3) Swern oxidation followed by acid catalysed cyclization of the obtained a-amino aldehydes.
Asymmetric synthesis of arylglycine amino acids using (S,S)-(+)- pseudoephedrine derived amides
Vicario, Jose L.,Badia, Dolores,Dominguez, Esther,Crespo, Ana,Carrillo, Luisa,Anakabe, Eneritz
, p. 7123 - 7126 (2007/10/03)
Arylglycine aminoacids were obtained in good yields and with enantiomeric excesses higher than 99% by using an asymmetric amination reaction protocol on (S,S)-(+)-pseudoephedrine based arylacetamide enolates with di-tert-butylazodicarboxylate. Subsequent hydrazinolysis and hydrolysis yielded the target aminoacids.
