Hydrodeamination of β-enamino ketones to 1,2-dideoxy-d-threo-3-hexulose via palladium
摘要:
beta-Enamino ketones Were Successfully synthesized in good to excellent yields by reaction of hex-1-en-3-uloses with amines. After hydrogenation on palladium catalyst, beta-enamino ketones effectively underwent hydrodeamination and were converted to the corresponding 1,2-dideoxy-D-threo-3-hexulose derivatives in 89-95% yields. Crown Copyright (C) 2009 Published by Elsevier Ltd. All rights reserved.
Donor Promiscuity of a Thermostable Transketolase by Directed Evolution: Efficient Complementation of 1-Deoxy-<scp>d</scp>
-xylulose-5-phosphate Synthase Activity
Enzymes catalyzing asymmetric carboligation reactions typically show very high substrate specificity for their nucleophilic donor substrate components. Structure‐guided engineering of the thermostable transketolase from Geobacillus stearothermophilus by directed in vitro evolution yielded new enzyme variants that are able to utilize pyruvate and higher aliphatic homologues as nucleophilic components
Broadening Deoxysugar Glycodiversity: Natural and Engineered Transaldolases Unlock a Complementary Substrate Space
作者:Madhura Rale、Sarah Schneider、Georg A. Sprenger、Anne K. Samland、Wolf-Dieter Fessner
DOI:10.1002/chem.201002942
日期:2011.2.25
inaccessible by available enzymes, from a [3×8] substrate matrix. Although aliphatic and hydroxylated aliphatic aldehydes were good substrates, D‐lactaldehyde was found to be an inhibitor possibly as a consequence of inactive substratebinding to the catalytic Lys residue. A 1‐hydroxy‐2‐alkanone moiety was identified as a common requirement for the donor substrate, whereas propanone and butanone were inactive
Synthesis of Deoxysugars from Aliphatic α‐Ketoacids and Aldoses Catalyzed by Thermostable Transketolase Variants from
<i>Geobacillus stearothermophilus</i>
作者:Nazim Ocal、Giuseppe Arbia、Aurélie Lagarde、Muriel Joly、Samantha Gittings、Kirsty M. Graham、Franck Charmantray、Laurence Hecquet
DOI:10.1002/adsc.202201190
日期:2023.1.10
We described a strategy for the enzymatic synthesis of 1-deoxy and 1,2-deoxyketoses from the aliphatic α-ketoacids, pyruvate and 2-oxobutyrate, as donors and natural aldoses of variable chain length as acceptors, catalyzed by thermostable transketolase variants from Geobacillus stearothermophilus (TKgst). Analytical studies have been carried out on a panel of TKgst variants with the appropriate substrates
We demonstrate that transketolase variants from Geobacillus stearothermophilus catalyse an acyloin condensation reaction involving two hydroxylated or not aliphatic aldehydes. This promiscuous TK-catalysed reaction offers an attractive alternative to the ketol transfer from α-ketoacids used as donor substrates in the usual TK mechanism, adding atom economy by avoiding carbon dioxide release. Transketolase
Hydrodeamination of β-enamino ketones to 1,2-dideoxy-d-threo-3-hexulose via palladium
作者:Zi-Ping Lin、Hui-Chang Lin、Hsu-Hsuan Wu、Hsiu-Wen Chou、Shao-Kai Lin、Kuan-Chin Sung、Fung Fuh Wong
DOI:10.1016/j.tetlet.2009.06.112
日期:2009.9
beta-Enamino ketones Were Successfully synthesized in good to excellent yields by reaction of hex-1-en-3-uloses with amines. After hydrogenation on palladium catalyst, beta-enamino ketones effectively underwent hydrodeamination and were converted to the corresponding 1,2-dideoxy-D-threo-3-hexulose derivatives in 89-95% yields. Crown Copyright (C) 2009 Published by Elsevier Ltd. All rights reserved.