Commercially available omega-carboxy-aldehydes and glycine have been subjected to the catalytic action of an L-threonine aldolase from Escherichia coli to give the corresponding beta-hydroxy-alpha-(L)-amino acids as a mixture of erythro/threo epimers. Specifically, the reaction with glyoxylic acid (2) gave the epimeric beta-hydroxy-(L)-aspartates (t,e)-9 that could be isolated by ion-exchange chromatography in 67% yield. Following esterification and N-Boc protection, the two epimers could be isolated as pure compounds. Similarly, the aldolase-catalyzed addition of glycine to succinic semialdehyde (4) gave the expected mixture of beta-hydroxy-L-alpha-aminoadipic acids (t)-12 and (e)-12 in 34% yield. (C) 2008 Elsevier Ltd. All rights reserved.
Enzymatic synthesis of omega-carboxy-beta-hydroxy-(L)-alpha-amino acids / F., Sagui; P., Conti; G., Roda; Contestabile, Roberto; S., Riva. - In: TETRAHEDRON. - ISSN 0040-4020. - STAMPA. - 64:(2008), pp. 5079-5084. [10.1016/j.tet.2008.03.070]
Enzymatic synthesis of omega-carboxy-beta-hydroxy-(L)-alpha-amino acids
CONTESTABILE, Roberto;
2008
Abstract
Commercially available omega-carboxy-aldehydes and glycine have been subjected to the catalytic action of an L-threonine aldolase from Escherichia coli to give the corresponding beta-hydroxy-alpha-(L)-amino acids as a mixture of erythro/threo epimers. Specifically, the reaction with glyoxylic acid (2) gave the epimeric beta-hydroxy-(L)-aspartates (t,e)-9 that could be isolated by ion-exchange chromatography in 67% yield. Following esterification and N-Boc protection, the two epimers could be isolated as pure compounds. Similarly, the aldolase-catalyzed addition of glycine to succinic semialdehyde (4) gave the expected mixture of beta-hydroxy-L-alpha-aminoadipic acids (t)-12 and (e)-12 in 34% yield. (C) 2008 Elsevier Ltd. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
