250666-02-5Relevant academic research and scientific papers
Practical and convenient enzymatic synthesis of enantiopure α-amino acids and amides
Wang, Mei-Xiang,Lin, Shuang-Jun
, p. 6542 - 6545 (2007/10/03)
Catalyzed by the nitrile hydratase and the amidease in Rhodococcus sp. AJ270 cells under very mild conditions, a number of α-aryl- and α-alkyl-substituted DL-glycine nitriles 1 rapidly underwent a highly enantioselective hydrolysis to afford D-(-)-α-amino acid amides 2 and L-(+)-α-amino acids 3 in high yields with excellent enantiomeric excesses in most cases. The overall enantioselectivity of the biotransformations of nitriles originated from the combined effects of a high L-enantioselective amidase and a low enantioselective nitrile hydratase. The influence of the substrates on both reaction efficiency and enantioselectivity was also discussed in terms of steric and electronic effects. Coupled with chemical hydrolysis of D-(-)-α-phenylglycine amide, biotransformation of DL-phenylglycine nitrile was applied in practical scale to produce both D- and L-phenylglycines in high optical purity.
Highly efficient and enantioselective synthesis of L-arylglycines and D-arylglycine amides from biotransformations of nitriles
Wang, Mei-Xiang,Lin, Shuang-Jun
, p. 6925 - 6927 (2007/10/03)
Under very mild conditions, the Rhodococcus sp. AJ270-catalysed biotransformation of arylglycine nitriles 1, prepared easily from the reaction of substituted benzaldehydes, ammonium chloride and potassium cyanide, proceeded efficiently to produce optically active D-arylglycine amides 2 and L-arylglycines 3 in excellent yields with enantiomeric excesses higher than 99%.
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.
