65451-19-6Relevant articles and documents
Enantioselective acylation of β-phenylalanine acid and its derivatives catalyzed by penicillin G acylase from alcaligenes faecalis
Li, Dengchao,Ji, Lilian,Wang, Xinfeng,Wei, Dongzhi
, p. 207 - 216 (2013/04/23)
This study developed a simple, efficient method for producing racemic β-phenylalanine acid (BPA) and its derivatives via the enantioselective acylation catalyzed by the penicillin G acylase from Alcaligenes faecalis (Af-PGA). When the reaction was run at 25°C and pH 10 in an aqueous medium containing phenylacetamide and BPA in a molar ratio of 2:1, 8 U/mL enzyme and 0.1 M BPA, the maximum BPA conversion efficiency at 40 min only reached 36.1%, which, however, increased to 42.9% as the pH value and the molar ratio of phenylacetamide to BPA were elevated to 11 and 3:1, respectively. Under the relatively optimum reaction conditions, the maximum conversion efficiencies of BPA derivatives all reached about 50% in a relatively short reaction time (45-90 min). The enantiomeric excess value of product (eep) and enantiomeric excess value of substrate (ees) were all above 98% and 95%, respectively. These results suggest that the method established in this study is practical, effective, and environmentally benign and may be applied to industrial production of enantiomerically pure BPA and its derivatives.
An expedient synthesis of 6-arylpiperidine-2,4-diones by chain-extension of β-aryl-β-aminoacids
Leflemme, Nicolas,Dallemagne, Patrick,Rault, Sylvain
, p. 8997 - 8999 (2007/10/03)
The synthesis of novel 6-arylpiperidine-2,4-diones is described in five steps starting from β-aryl-β-aminoacids via the chain extension of the latter into δ-aryl-δ-amino-β-ketoacids. The chemical pathway involves an acylation of Meldrum's acid and yields useful building blocks for heterocyclic chemistry.
A new diastereoselective synthesis of anti-α-alkyl α-hydroxy β-amino acids
Cardillo, Giuliana,Tolomelli, Alessandra,Tomasini, Claudia
, p. 155 - 161 (2007/10/03)
As part of an ongoing project concerning the synthesis of enantiomerically pure α-hydroxy β-amino acids, we have now developed a general strategy allowing the synthesis of anti-α-alkyl α-hydroxy β-amino acids. Our procedure involves the intermediate formation of trans-oxazolines, which are alkylated at C-5 with good to high diastereoselectivity and then hydrolysed under mildly acidic conditions, affording in quantitative yield the corresponding hydroxy amides. The starting (R)-3-amino-3-phenylpropanoic acid and (S)-3-aminobutanoic acid were obtained in enantiomerically pure form by selective enzymatic hydrolysis of the corresponding phenylacetylamides with penicillin G acylase.