- Enantioselective acylation of β-phenylalanine acid and its derivatives catalyzed by penicillin G acylase from alcaligenes faecalis
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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.
- Li, Dengchao,Ji, Lilian,Wang, Xinfeng,Wei, Dongzhi
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p. 207 - 216
(2013/04/23)
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- 1-aza-2-alkyl-6-aryl-cycloalkane compounds
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Compound of formula (I): wherein: n represents 0 or 1, R1represents hydrogen, arylalkyl, alkyl, acyl, alkoxycarbonyl, arylalkoxycarbonyl or trifluoroacetyl, R2represents alkyl, X represents oxygen, chlorine, OR3, SR4
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- Efficient synthesis of 2-aryl-6-methyl-2,3-dihydro-1H-pyridin-4-ones
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Syntheses of 2-aryl-6-methyl-2,3-dihydro-1H-pyridin-4-ones were achieved starting from corresponding β-arylβ-amino acids. This reaction sequence involved, as a key step, the condensation of an acid chloride with a diketone using SmI3 as catalyst. A final intramolecular cyclization furnished the attempted product. (C) 2000 Elsevier Science Ltd.
- Renault, Olivier,Guillon, Jean,Dallemagne, Patrick,Rault, Sylvain
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p. 681 - 683
(2007/10/03)
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