novel chiral pyridoxamines 3a–g containing a sidechain has been developed. The pyridoxamines displayed catalytic activity and promising enantioselectivity in biomimetic asymmetric transamination of α-keto acids, to give various α-amino acids in 47–90% yields with up to 87% ee’s under very mild conditions. An interesting effect of the sidechain on enantioselectivity was observed in the reaction.
Enzym mit LeuDH-Aktivität, dafür codierende Nukleotid-Sequenz und Verfahren zur Herstellung des Enzyms
申请人:Degussa Aktiengesellschaft
公开号:EP0792933A2
公开(公告)日:1997-09-03
Die Erfindung betrifft ein Enzym mit LeuDH-Aktivität, die dafür codierende Nukleotid-Sequenz aus B.cereus, die Transformation von Mikroorganismen der Gattung E.coli mit einem diese Sequenz enthaltenden Plasmid und ein Verfahren zur Herstellung des Enzyms.
A series of chiral pyridoxals 8 and 9 have been developed from commercially available pyridoxine and (S)-alpha,alpha-diarylprolinols. The pyridoxals exhibited good catalytic activity in an asymmetric transamination of alpha-keto acids with 2,2-diphenylglycine (7f) as the amine source to give various alpha-amino acids in 29-85% yields with 53-80% ee's. The current asymmetric transamination has successfully mimicked a complete biological transamination process characterized by two half-transaminations, a small chiral pyridoxal molecule acting as the catalyst, and enantioselective control.
US5854035A
申请人:——
公开号:US5854035A
公开(公告)日:1998-12-29
Enzyme-Inspired Axially Chiral Pyridoxamines Armed with a Cooperative Lateral Amine Chain for Enantioselective Biomimetic Transamination
transamination is catalyzed by pyridoxal/pyridoxamine, and it involves remarkable cooperativecatalysis of a Lys residue in the transaminase. Inspired by transaminases, we developed a class of axially chiral pyridoxamines 11 bearing a lateral amine arm. The pyridoxamines exhibited high catalytic activity and excellent enantioselectivity in asymmetric transamination of α-keto acids, to give various α-amino