Cyclische Oligomere von (<i>R</i>)-3-Hydroxybuttersäure: Herstellung und strukturelle Aspekte
作者:Diemar A. Plattner、Andreas Brunner、Max Dobler、Hans-Martin Müller、Walter Petter、Peter Zbinden、Dieter Seebach
DOI:10.1002/hlca.19930760518
日期:1993.8.11
Cyclic Oligomers of (R)-3-Hydroxybutanoic Acid: Preparation and Structural Aspects
(R)-3-羟基丁酸的环状低聚物:制备和结构方面。
Biomimetic Synthesis of Resorcylate Natural Products Utilizing Late Stage Aromatization: Concise Total Syntheses of the Marine Antifungal Agents 15G256ι and 15G256β
作者:Ismael Navarro、Jean-François Basset、Séverine Hebbe、Sarah M. Major、Thomas Werner、Catherine Howsham、Jan Bräckow、Anthony G. M. Barrett
DOI:10.1021/ja803445u
日期:2008.8.1
sequential reaction with potassium carbonate and methanolic hydrogen chloride to give resorcylate esters. The reaction was applied in the total synthesis of the marine antifungal agents 15G256beta (1), 15G256iota (2), and 15G256pi (3) and the mycotoxin S-(-)-zearalenone (4).
Recombinant microorganism expressing polyhydroxyalkanoate biosynthesis enzyme and intracellular PHA depolymerase
申请人:——
公开号:US20030143703A1
公开(公告)日:2003-07-31
The present invention provides recombinant plasmids containing a gene coding for polyhydroxyalkanoate (PHA) biosynthesis enzyme and a gene coding for intracellular PHA depolymerase, and a process for preparing (R)-hydroxycarboxylic acid employing the same. In accordance with the present invention, optically pure (R)-hydroxycarboxylic acid can be prepared by culturing
E. coli
transformed with a recombinant plasmid which expresses intracellular PHA depolymerase of
Ralstonia eutropha
and PHA biosynthesis enzyme of
Alcaligenes latus
to give (R)-hydroxycarboxylic acid. The process for preparing (R)-hydroxycarboxylic acid of the invention can be successfully employed in large-scale continuous process with a high productivity by carrying out PHA synthesis and degradation in a simultaneous manner, while enjoying the benefits of simple procedures for harvesting cells and disposing the cell wastes.
Rhizopus arrhizus mediated asymmetric reduction of alkyl 3-oxobutanoates
作者:Neeta A. Salvi、Subrata Chattopadhyay
DOI:10.1016/j.tetasy.2004.09.026
日期:2004.11
Alkyl 3-oxobutanoates (alkyl: methyl, ethyl, allyl, isobutyl, t-butyl) were reduced enantio selectively to the corresponding (S)-alcohols by the fungus Rhizopus arrhizus and other Rhizopus sp. The best result obtained was with t-butyl 3-oxobutanoate, which was reduced by R. arrhizus with 99% enantiomeric excess and similar to68% isolated yield. (C) 2004 Published by Elsevier Ltd.
(R)-hydroxycarboxylic acid producing recombinant microorganism and process for preparing (r)-hydroxycarboxylic acid using the same
申请人:Lee Sang-Yup
公开号:US20050069995A1
公开(公告)日:2005-03-31
The present invention relates to recombinant microorganisms carrying both a gene encoding intracellular polyhydroxyalkanoate (PHA) depolymerase and a gene encoding PHA biosynthesis-related enzymes, and a process for preparing optically pure (R)-hydroxycarboxylic acids by culturing the recombinant microorganisms. The present invention provides: a recombinant microorganism transformed with two recombinant plasmids each of which contains a gene encoding intracellular PHA depolymerase and a gene encoding PHA biosynthesis-related enzymes, respectively; a recombinant microorganism harboring a gene encoding PHA biosynthesis-related enzymes in an integrated form with its chromosome, which is transformed with a recombinant plasmid containing a gene encoding intracellular PHA depolymerase; and, a process for preparing optically pure (R)-hydroxycarboxylic acids by culturing the recombinant microorganisms. In accordance with the present invention, (R)-hydroxycarboxylic acids can be released from the recombinant microorganisms into culture media after depolymerizing most PHA produced from the said microorganisms, which makes possible practical preparation of (R)-hydroxycarboxylic acids in a simple manner with reduced waste of substrates to increase the productivity, finally to allow the mass production of various optically pure (R)-hydroxycarboxylic acids.