Pseudopyronines A and B, α-Pyrones Produced by a Marine Pseudomonas sp. F92S91, and Evidence for the Conversion of 4-Hydroxy-α-pyrone to 3-Furanone
摘要:
In our search for inhibitors of bacterial fatty acid biosynthesis, two new alpha-pyrones, pseudopyronines A (1) and B (2), were isolated from a marine Pseudomonas sp. F92S91. The naturally occurring a-pyrones appeared to be unstable, evidenced by the conversion of pseudopyronine B into an oxidation product, 3-furanone (3). Structural elucidations were made by spectroscopic analyses including 2D-NMR data.
Synthesis of the bis-potassium salts of 5-hydroxy-3-oxopent-4-enoic acids and their use for the efficient preparation of 4-hydroxy-2H-pyran-2-ones and other heterocycles
5-Hydroxy-3-oxopent-4-enoic acid esters can be efficiently transformed into the stable bis-potassium salts of the corresponding 5-hydroxy-3-oxopent-4-enoic acids, from which the sensitive acids are released in situ, the latter being converted into substituted 4-hydroxy-2H-pyran-2-ones, pyrazoles and isoxazoles under mild conditions; the efficiency of this method is demonstrated by the first synthesis
Two-step, high-yielding total synthesis of antibiotic pyrones
作者:Akram Hussain、Revoju Sravanthi、Sunitha Katta、Dhevalapally B. Ramachary
DOI:10.1039/d3ob01923c
日期:——
antibiotics photopyrones, pseudopyronines, and violapyrones from bio-renewable triacetate lactone in excellent yields. These pyrones are functionally modified into another set of pyrone natural products by a single O-methylation reaction. The high-yielding gram scale synthesis of four natural products [pseudopyronine A, photopyrone A, pseudopyronine B and photopyrone C] demonstrated the viability for
开发了一种简单的两步二烷基化方案,以优异的产率从生物可再生三乙酸内酯合成生物活性抗生素光吡喃酮、假吡喃酮和紫拉吡喃酮。这些吡喃酮通过单个O-甲基化反应被功能性修饰成另一组吡喃酮天然产物。四种天然产物 [pseudopyronine A、photopyrone A、pseudopyronine B 和 photopyrone C] 的高产克级合成证明了工业应用的可行性。
Processes and host cells for genome, pathway, and biomolecular engineering
申请人:enEvolv, Inc.
公开号:US10370654B2
公开(公告)日:2019-08-06
The present disclosure provides compositions and methods for genomic engineering.
本公开提供了基因组工程的组合物和方法。
PROCESSES AND HOST CELLS FOR GENOME, PATHWAY, AND BIOMOLECULAR ENGINEERING
申请人:ENEVOLV, INC.
公开号:US20160186168A1
公开(公告)日:2016-06-30
The present disclosure provides compositions and methods for genomic engineering.